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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Genomics of deep‐sea and sub‐seafloor microbes</title>
<author><name sortKey="Siezen, Roland J" sort="Siezen, Roland J" uniqKey="Siezen R" first="Roland J." last="Siezen">Roland J. Siezen</name>
<affiliation><nlm:aff id="au1">Kluyver Centre for Genomics of Industrial Fermentation; TI Food and Nutrition, 6700AN Wageningen, the Netherlands.</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="au2">NIZO Food Research, 6710BA Ede, The Netherlands.</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="au3">CMBI, Radboud University Nijmegen, 6500HB Nijmegen, the Netherlands.</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Wilson, Greer" sort="Wilson, Greer" uniqKey="Wilson G" first="Greer" last="Wilson">Greer Wilson</name>
<affiliation><nlm:aff id="au4">Science Consultant, Bowlespark 30, 6701DS Wageningen, the Netherlands.</nlm:aff>
</affiliation>
</author>
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<publicationStmt><idno type="wicri:source">PMC</idno>
<idno type="pmid">21261910</idno>
<idno type="pmc">3815836</idno>
<idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3815836</idno>
<idno type="RBID">PMC:3815836</idno>
<idno type="doi">10.1111/j.1751-7915.2009.00092.x</idno>
<date when="2009">2009</date>
<idno type="wicri:Area/Pmc/Corpus">000560</idno>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Genomics of deep‐sea and sub‐seafloor microbes</title>
<author><name sortKey="Siezen, Roland J" sort="Siezen, Roland J" uniqKey="Siezen R" first="Roland J." last="Siezen">Roland J. Siezen</name>
<affiliation><nlm:aff id="au1">Kluyver Centre for Genomics of Industrial Fermentation; TI Food and Nutrition, 6700AN Wageningen, the Netherlands.</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="au2">NIZO Food Research, 6710BA Ede, The Netherlands.</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="au3">CMBI, Radboud University Nijmegen, 6500HB Nijmegen, the Netherlands.</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Wilson, Greer" sort="Wilson, Greer" uniqKey="Wilson G" first="Greer" last="Wilson">Greer Wilson</name>
<affiliation><nlm:aff id="au4">Science Consultant, Bowlespark 30, 6701DS Wageningen, the Netherlands.</nlm:aff>
</affiliation>
</author>
</analytic>
<series><title level="j">Microbial biotechnology</title>
<idno type="ISSN">1751-7915</idno>
<idno type="eISSN">1751-7915</idno>
<imprint><date when="2009">2009</date>
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<biblStruct><analytic><author><name sortKey="Zeng, R" uniqKey="Zeng R">R. Zeng</name>
</author>
<author><name sortKey="Xiong, P" uniqKey="Xiong P">P. Xiong</name>
</author>
<author><name sortKey="Wen, J" uniqKey="Wen J">J. Wen</name>
</author>
</analytic>
</biblStruct>
<biblStruct><analytic><author><name sortKey="Zhang, J W" uniqKey="Zhang J">J.W. Zhang</name>
</author>
<author><name sortKey="Zeng, R Y" uniqKey="Zeng R">R.Y. Zeng</name>
</author>
</analytic>
</biblStruct>
</listBibl>
</div1>
</back>
</TEI>
<pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Microb Biotechnol</journal-id>
<journal-id journal-id-type="iso-abbrev">Microb Biotechnol</journal-id>
<journal-id journal-id-type="publisher-id">MBT</journal-id>
<journal-title-group><journal-title>Microbial biotechnology</journal-title>
</journal-title-group>
<issn pub-type="ppub">1751-7915</issn>
<issn pub-type="epub">1751-7915</issn>
<publisher><publisher-name>Blackwell Publishing Ltd</publisher-name>
<publisher-loc>Oxford, UK</publisher-loc>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">21261910</article-id>
<article-id pub-id-type="pmc">3815836</article-id>
<article-id pub-id-type="doi">10.1111/j.1751-7915.2009.00092.x</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Genomics Update</subject>
</subj-group>
</article-categories>
<title-group><article-title>Genomics of deep‐sea and sub‐seafloor microbes</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Siezen</surname>
<given-names>Roland J.</given-names>
</name>
<xref ref-type="aff" rid="au1">1</xref>
<xref ref-type="aff" rid="au2">2</xref>
<xref ref-type="aff" rid="au3">3</xref>
<xref ref-type="corresp" rid="cor1">*</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Wilson</surname>
<given-names>Greer</given-names>
</name>
<xref ref-type="aff" rid="au4">4</xref>
</contrib>
</contrib-group>
<aff id="au1"><label>1</label>
Kluyver Centre for Genomics of Industrial Fermentation; TI Food and Nutrition, 6700AN Wageningen, the Netherlands.</aff>
<aff id="au2"><label>2</label>
NIZO Food Research, 6710BA Ede, The Netherlands.</aff>
<aff id="au3"><label>3</label>
CMBI, Radboud University Nijmegen, 6500HB Nijmegen, the Netherlands.</aff>
<aff id="au4"><label>4</label>
Science Consultant, Bowlespark 30, 6701DS Wageningen, the Netherlands.</aff>
<author-notes><corresp id="cor1">*E‐mail <email>r.siezen@cmbi.ru.nl</email>
; Tel. (+31) 24 3619559; Fax (+31) 24 3619395.
</corresp>
</author-notes>
<pub-date pub-type="ppub"><month>3</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub"><day>18</day>
<month>2</month>
<year>2009</year>
</pub-date>
<volume>2</volume>
<issue>2</issue>
<fpage>157</fpage>
<lpage>163</lpage>
<permissions><copyright-statement>© 2009 The Authors. Journal compilation © 2009 Society for Applied Microbiology and Blackwell Publishing Ltd</copyright-statement>
<copyright-year>2009</copyright-year>
</permissions>
</article-meta>
</front>
<body><p>Over two‐thirds of the surface of the earth is covered by oceans, which have an average depth of about 3800 m. As each drop of ocean water contains > 10<sup>5</sup>
cells, the > 10<sup>30</sup>
microbial cells in the ocean represent the largest reservoir of microbes on earth (<xref ref-type="bibr" rid="b37">Whitman <italic>et al.</italic>
, 1998</xref>
). Communities of bacteria, archaea, protists and unicellular fungi account for most of the oceanic biomass and metabolism. Marine microbes are known to play an essential role in the global cycling of nitrogen, carbon, oxygen, phosphorous, iron, sulfur and trace elements (<xref ref-type="bibr" rid="b16">Karl, 2007</xref>
).</p>
<p>The largest metagenome sequencing projects undertaken to date involved surface seawater samples from the Sargasso Sea (<xref ref-type="bibr" rid="b34">Venter <italic>et al.</italic>
, 2004</xref>
) and the Global Ocean Sampling (GOS) (<xref ref-type="bibr" rid="b41">Yooseph <italic>et al.</italic>
, 2007</xref>
) expeditions conducted by Craig Venter and colleagues. The GOS analysis has shown that the numbers of newly discovered protein families in microbes have not yet reached a plateau, and in fact the curve is still rising. This means that there are many more functionalities to be discovered. This surface seawater metagenome sequencing did not take into account the piezophiles (= pressure‐loving) and so it would be reasonable to assume that this is still a large and generally untapped source of potentially useful enzymes and products.</p>
<p>The microbes of the very deep differ from those isolated from shallow waters in several aspects. The GOS analysis suggests that near‐surface microorganisms do not need chemotaxis, flagellae or pili to actively swim around in search of food, as they rely mostly on the plentiful O<sub>2</sub>
, CO<sub>2</sub>
and sunlight for photosynthesis. Yet this is not the case for the deep‐sea piezophilic psychrophiles. Deep‐sea environments are characterized by low temperature (1–2°C), high pressure (1 MPa for every 100 m), high‐salt and low‐nutrient conditions. Pressure affects various aspects of metabolism in very different ways (<xref ref-type="bibr" rid="b28">Simonato <italic>et al.</italic>
, 2006</xref>
). Little light penetrates below 500 m, the presence of food is scarce and many organisms have adapted to survive long periods without nutrition. Prokaryotic adaptation to deep sea habitats has been reviewed by <xref ref-type="bibr" rid="b28">Simonato and colleagues (2006</xref>
) and <xref ref-type="bibr" rid="b20">Lauro and Bartlett (2008</xref>
). It is assumed that life here will be heterotrophic and largely supported by influxes of nutrients coming down from the more ‘fertile’ waters above. Nutrients slowly reach the seabed in the form of dead whales, crustaceans, fish, kelp, wood and their debris. These all carry the microbiota that was associated with them as they sank to the ocean bed (<xref ref-type="bibr" rid="b7">Egan <italic>et al.</italic>
, 2008</xref>
). These surface‐associated microbes can to a certain extent also adapt to the changing conditions in which they now find themselves.</p>
<p>Microbial isolates or communities of some deep‐sea ‘oases’ such as hydrothermal vents in the seafloor (<xref ref-type="bibr" rid="b22">Nakagawa and Takai, 2008</xref>
) or whale falls (<xref ref-type="bibr" rid="b33">Tringe <italic>et al.</italic>
, 2005</xref>
) have been sampled and studied, but these are exceptions which we do not address here.</p>
<sec><title>Databases and computing tools</title>
<p>Marine microbe researchers are highly organized with respect to storing and sharing their data. The Community Cyberinfrastructure for Advanced Marine Microbial Ecology Research and Analysis (CAMERA) aims to develop global methods for monitoring microbial communities in the ocean and their response to environmental changes. The CAMERA's database (<ext-link ext-link-type="uri" xlink:href="http://camera.calit2.net">http://camera.calit2.net</ext-link>
) includes environmental metagenomic and genomic sequence data, associated environmental parameters (‘metadata’), pre‐computed search results, and software tools to support powerful cross‐analysis of environmental samples (<xref ref-type="bibr" rid="b26">Seshadri <italic>et al.</italic>
, 2007</xref>
) (<xref ref-type="fig" rid="f1">Fig. 1</xref>
). The CAMERA includes the Sargasso Sea and GOS expedition data, as well as a vertical profile of marine microbial communities collected at the Hawaii Ocean Time‐Series station ALOHA by Ed DeLong and his research team at MIT. In addition, the MetaLook software has been developed for visualisation, analysis and comparison of marine ecological genomic and metagenomic data with respect to habitat parameters (<ext-link ext-link-type="uri" xlink:href="http://www.megx.net/metalook">http://www.megx.net/metalook</ext-link>
) (<xref ref-type="fig" rid="f2">Fig. 2</xref>
).</p>
<fig id="f1" position="float"><label>Figure 1</label>
<caption><p>Example of a <sc>blast</sc>
search by CAMERA.</p>
</caption>
<graphic xlink:href="mbt0002-0157-f1"></graphic>
</fig>
<fig id="f2" position="float"><label>Figure 2</label>
<caption><p>The starting point of MetaLook: the world map showing genomics and metagenomics sampling sites. Clicking on a location will provide all genomics and meta data.</p>
</caption>
<graphic xlink:href="mbt0002-0157-f2"></graphic>
</fig>
</sec>
<sec><title>(Meta)genome sequencing of deep‐sea microbes</title>
<p>Thanks to initiatives by the Gordon and Betty Moore Foundation, nearly 200 genomes of culturable marine bacteria have been sequenced since 2004 (<ext-link ext-link-type="uri" xlink:href="http://www.moore.org/microgenome/">http://www.moore.org/microgenome/</ext-link>
). <xref ref-type="table" rid="t1">Table 1</xref>
summarizes deep‐sea and sediment (meta)genome sequencing projects.</p>
<table-wrap id="t1" position="float"><label>Table 1</label>
<caption><p>Deep‐sea and sediment genome sequencing projects.</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1">Phylum</th>
<th align="left" rowspan="1" colspan="1">Order</th>
<th align="left" rowspan="1" colspan="1">Organism</th>
<th align="left" rowspan="1" colspan="1">Isolation</th>
<th align="left" rowspan="1" colspan="1">Depth (m)</th>
<th align="left" rowspan="1" colspan="1">Reference/data</th>
</tr>
</thead>
<tbody><tr><td align="left" rowspan="1" colspan="1">Euryarchaeota</td>
<td align="left" rowspan="1" colspan="1">Methanococci</td>
<td align="left" rowspan="1" colspan="1"><italic>Methanococcus aeolicus</italic>
Nankai‐3</td>
<td align="left" rowspan="1" colspan="1">Deep marine sediment, Nankai Trough Japan</td>
<td rowspan="1" colspan="1"></td>
<td align="left" rowspan="1" colspan="1">NC_009635</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Euryarchaeota</td>
<td align="left" rowspan="1" colspan="1">Methanomicrobia</td>
<td align="left" rowspan="1" colspan="1"><italic>Methanoculleus marisnigri</italic>
JR1</td>
<td align="left" rowspan="1" colspan="1">Sediment, Black Sea</td>
<td rowspan="1" colspan="1"></td>
<td align="left" rowspan="1" colspan="1">NC_009051</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Chlorobi</td>
<td align="left" rowspan="1" colspan="1">Chlorobia</td>
<td align="left" rowspan="1" colspan="1"><italic>Chlorobium phaeobacteroides</italic>
BS1</td>
<td align="left" rowspan="1" colspan="1">Chemocline, Black Sea</td>
<td rowspan="1" colspan="1"></td>
<td align="left" rowspan="1" colspan="1">NC_010831</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Proteobacteria</td>
<td align="left" rowspan="1" colspan="1">Gammaproteobacteria</td>
<td align="left" rowspan="1" colspan="1"><italic>Shewanella piezotolerans</italic>
WP3</td>
<td align="left" rowspan="1" colspan="1">Sediment, west Pacific</td>
<td align="left" rowspan="1" colspan="1">1914</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b36">Wang <italic>et al.</italic>
(2008</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Proteobacteria</td>
<td align="left" rowspan="1" colspan="1">Gammaproteobacteria</td>
<td align="left" rowspan="1" colspan="1"><italic>Alteromonas macleodii</italic>
DSM 17117</td>
<td align="left" rowspan="1" colspan="1">Seawater, Urania Basin, Mediterranean</td>
<td align="left" rowspan="1" colspan="1">3500</td>
<td align="left" rowspan="1" colspan="1">NC_011138</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Proteobacteria</td>
<td align="left" rowspan="1" colspan="1">Gammaproteobacteria</td>
<td align="left" rowspan="1" colspan="1"><italic>Moritella</italic>
sp. PE36</td>
<td align="left" rowspan="1" colspan="1">Patton escarpment, off San Diego, Pacific</td>
<td rowspan="1" colspan="1"></td>
<td align="left" rowspan="1" colspan="1">NZ_ABCQ00000000</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Proteobacteria</td>
<td align="left" rowspan="1" colspan="1">Gammaproteobacteria</td>
<td align="left" rowspan="1" colspan="1"><italic>Psychromonas</italic>
sp. CNPT3</td>
<td align="left" rowspan="1" colspan="1">Central north Pacific</td>
<td align="left" rowspan="1" colspan="1">5800</td>
<td align="left" rowspan="1" colspan="1">NZ_AAPG00000000</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Proteobacteria</td>
<td align="left" rowspan="1" colspan="1">Gammaproteobacteria</td>
<td align="left" rowspan="1" colspan="1"><italic>Shewanella benthica</italic>
KT99, PT99</td>
<td align="left" rowspan="1" colspan="1">Tonga‐Kermadec Trench, Pacific</td>
<td align="left" rowspan="1" colspan="1">9000</td>
<td align="left" rowspan="1" colspan="1">NZ_ABIC00000000</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Proteobacteria</td>
<td align="left" rowspan="1" colspan="1">Gammaproteobacteria</td>
<td align="left" rowspan="1" colspan="1"><italic>Shewanella woodyi</italic>
MS32</td>
<td align="left" rowspan="1" colspan="1">Sediment, Strait of Gibraltar, Mediterranean</td>
<td align="left" rowspan="1" colspan="1">5110</td>
<td align="left" rowspan="1" colspan="1">NC_010506</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Proteobacteria</td>
<td align="left" rowspan="1" colspan="1">Gammaproteobacteria</td>
<td align="left" rowspan="1" colspan="1"><italic>Shewanella loihica</italic>
PV‐4</td>
<td align="left" rowspan="1" colspan="1">Iron‐rich mat, Naha Vents, Hawaii</td>
<td align="left" rowspan="1" colspan="1">1325</td>
<td align="left" rowspan="1" colspan="1">NC_009092</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Proteobacteria</td>
<td align="left" rowspan="1" colspan="1">Gammaproteobacteria</td>
<td align="left" rowspan="1" colspan="1"><italic>Shewanella</italic>
sp. W3‐18‐1</td>
<td align="left" rowspan="1" colspan="1">Sediment, Washington, Pacific</td>
<td align="left" rowspan="1" colspan="1">997</td>
<td align="left" rowspan="1" colspan="1">NC_008750</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Proteobacteria</td>
<td align="left" rowspan="1" colspan="1">Gammaproteobacteria</td>
<td align="left" rowspan="1" colspan="1"><italic>Shewanella violacea</italic>
DSS12</td>
<td align="left" rowspan="1" colspan="1">Sediment, Ryukyu Trench, Philippine Sea</td>
<td align="left" rowspan="1" colspan="1">5110</td>
<td align="left" rowspan="1" colspan="1"><email>nakasone@hiro.kindai.ac.jp</email>
</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Proteobacteria</td>
<td align="left" rowspan="1" colspan="1">Gammaproteobacteria</td>
<td align="left" rowspan="1" colspan="1"><italic>Photobacterium profundum</italic>
SS9</td>
<td align="left" rowspan="1" colspan="1">Sulu Trough</td>
<td align="left" rowspan="1" colspan="1">2500</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b35">Vezzi <italic>et al.</italic>
(2005</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Proteobacteria</td>
<td align="left" rowspan="1" colspan="1">Alphaproteobacteria</td>
<td align="left" rowspan="1" colspan="1"><italic>Roseobacter</italic>
sp. SK209‐2‐6</td>
<td align="left" rowspan="1" colspan="1">Arabian Sea</td>
<td align="left" rowspan="1" colspan="1">2500</td>
<td align="left" rowspan="1" colspan="1">NZ_AAYC00000000</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Proteobacteria</td>
<td align="left" rowspan="1" colspan="1">Epsilonproteobacteria</td>
<td align="left" rowspan="1" colspan="1"><italic>Sulfurimonas autotrophica</italic>
OK10</td>
<td align="left" rowspan="1" colspan="1">Deep‐sea sediment, Mid‐Okinawa Trough, Japan</td>
<td rowspan="1" colspan="1"></td>
<td align="left" rowspan="1" colspan="1"><email>microbes@cuba.jgi‐psf.org</email>
</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Proteobacteria</td>
<td align="left" rowspan="1" colspan="1">Zetaproteobacteria</td>
<td align="left" rowspan="1" colspan="1"><italic>Mariprofundus ferrooxydans</italic>
PV‐1</td>
<td align="left" rowspan="1" colspan="1">Loihi Seamount, Hawaii</td>
<td align="left" rowspan="1" colspan="1">1100</td>
<td align="left" rowspan="1" colspan="1">NZ_AATS00000000</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Firmicutes</td>
<td align="left" rowspan="1" colspan="1">Bacilli</td>
<td align="left" rowspan="1" colspan="1"><italic>Oceanobacillus iheyensis</italic>
HTE831</td>
<td align="left" rowspan="1" colspan="1">Deep sea mud, Iheya ridge, Okinawa Japan</td>
<td align="left" rowspan="1" colspan="1">1050</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b32">Takami <italic>et al.</italic>
(2002</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Firmicutes</td>
<td align="left" rowspan="1" colspan="1">Bacilli</td>
<td align="left" rowspan="1" colspan="1"><italic>Carnobacterium</italic>
sp. AT7</td>
<td align="left" rowspan="1" colspan="1">Aleutian Trench</td>
<td align="left" rowspan="1" colspan="1">2500</td>
<td align="left" rowspan="1" colspan="1">NZ_ABHH00000000</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Firmicutes</td>
<td align="left" rowspan="1" colspan="1">Clostridia</td>
<td align="left" rowspan="1" colspan="1"><italic>Carboxydibrachium pacificum</italic>
JM</td>
<td align="left" rowspan="1" colspan="1">Okinawa Trough</td>
<td align="left" rowspan="1" colspan="1">1500</td>
<td align="left" rowspan="1" colspan="1">NZ_ABXP00000000</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Metagenomes</td>
<td rowspan="1" colspan="1"></td>
<td rowspan="1" colspan="1"></td>
<td rowspan="1" colspan="1"></td>
<td rowspan="1" colspan="1"></td>
<td rowspan="1" colspan="1"></td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"> Unclassified</td>
<td align="left" rowspan="1" colspan="1">Unclassified</td>
<td align="left" rowspan="1" colspan="1">Marine anammox community</td>
<td align="left" rowspan="1" colspan="1">Deep sea</td>
<td rowspan="1" colspan="1"></td>
<td align="left" rowspan="1" colspan="1"><email>sgtringe@lbl.gov</email>
</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"> Unclassified</td>
<td align="left" rowspan="1" colspan="1">Unclassified</td>
<td align="left" rowspan="1" colspan="1">Marine archaeal anaerobic oxidation of methane communities</td>
<td align="left" rowspan="1" colspan="1">Sediment, Eel River Basin, Mendocino California</td>
<td align="left" rowspan="1" colspan="1">520</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b11">Hallam <italic>et al.</italic>
(2004</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"> Unclassified</td>
<td align="left" rowspan="1" colspan="1">Unclassified</td>
<td align="left" rowspan="1" colspan="1">Marine planktonic communities</td>
<td align="left" rowspan="1" colspan="1">North Pacific Ocean, ALOHA station, Hawaii</td>
<td align="left" rowspan="1" colspan="1">500–4000</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b5">DeLong <italic>et al.</italic>
(2006</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"> Unclassified</td>
<td align="left" rowspan="1" colspan="1">Unclassified</td>
<td align="left" rowspan="1" colspan="1">Marine microbial communities</td>
<td align="left" rowspan="1" colspan="1">Seep water masses of the North Atlantic</td>
<td align="left" rowspan="1" colspan="1">500–4121</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b29">Sogin <italic>et al.</italic>
(2006</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"> Unclassified</td>
<td align="left" rowspan="1" colspan="1">Unclassified</td>
<td align="left" rowspan="1" colspan="1">Marine planktonic communities</td>
<td align="left" rowspan="1" colspan="1">Mediterranean Sea, Ionian Km3 Station</td>
<td align="left" rowspan="1" colspan="1">3010</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b21">Martin‐Cuadrado <italic>et al.</italic>
(2007</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1"> Unclassified</td>
<td align="left" rowspan="1" colspan="1">Unclassified</td>
<td align="left" rowspan="1" colspan="1">Sediment microbial communities</td>
<td align="left" rowspan="1" colspan="1">Sub‐seafloor, Peru Margin</td>
<td align="left" rowspan="1" colspan="1">1229</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b3">Biddle <italic>et al.</italic>
(2008</xref>
)</td>
</tr>
</tbody>
</table>
<table-wrap-foot><fn><p>Adapted from the GOLD database (<ext-link ext-link-type="uri" xlink:href="http://www.genomesonline.org">http://www.genomesonline.org</ext-link>
; December 2008).</p>
</fn>
</table-wrap-foot>
</table-wrap>
<p>Most of the sequenced culturable microorganisms from the deep‐sea are Alteromonadales from the Gammaproteobacteria. Unique properties of sequenced deep‐sea microbes are that they all have a high ratio of rRNA operon copies per genome size, and that their intergenic regions are larger than average (<xref ref-type="bibr" rid="b20">Lauro and Bartlett, 2008</xref>
). These properties are characteristic of bacteria with an opportunistic lifestyle and a high degree of gene regulation to respond rapidly to environmental changes when searching for food. A large number of genes are found for synthesis of mono‐ and poly‐unsaturated fatty acids and membrane unsaturation in these deep dwelling microorganisms, as they need to maintain membrane fluidity at low temperature and high pressure (<xref ref-type="bibr" rid="b28">Simonato <italic>et al.</italic>
, 2006</xref>
). They also contain a larger than average repertoire of transport proteins for scavenging different types of food. Large numbers of proteins are encoded for chemotaxis, flagellar assembly and motor function to allow them to hunt for dissolved and particulate organic matter, also called ‘marine snow’ (<xref ref-type="bibr" rid="b1">Azam and Long, 2001</xref>
; <xref ref-type="bibr" rid="b18">Kiorboe and Jackson, 2001</xref>
). The latter consists mainly of diffuse gels with a variety of organisms living together in biofilms and communities highly dependent upon each other for survival. The marine snow can sink thousands of metres into the sea. This brings down to the seabed a lot of organic material, nitrogen and phosphorus, helping to sustain the communities present at depth (for a review see <xref ref-type="bibr" rid="b2">Azam and Malfatti, 2007</xref>
). In order to make use of this food source the microorganisms have fine‐tuned hydrolytic enzymes and nutrient uptake systems.</p>
<p>Very few metagenomics studies of deep‐sea communities have been reported so far, and include only deep water samples from the North Pacific Gyre ALOHA station (<xref ref-type="bibr" rid="b5">DeLong <italic>et al.</italic>
, 2006</xref>
) and the Ionian Sea in the Mediterranean (<xref ref-type="bibr" rid="b21">Martin‐Cuadrado <italic>et al.</italic>
, 2007</xref>
), and (sub)seafloor samples from the Peru Margin (<xref ref-type="bibr" rid="b3">Biddle <italic>et al.</italic>
, 2008</xref>
) and the Eel Basin off the coast of California (<xref ref-type="bibr" rid="b11">Hallam <italic>et al.</italic>
, 2004</xref>
) (<xref ref-type="table" rid="t1">Table 1</xref>
). The cold (2–5°C) North Pacific deep waters were found to contain <italic>Deferribacteres</italic>
, <italic>Planctomycetaceae</italic>
, <italic>Acidobacteriales</italic>
, <italic>Gemmatomonadaceae</italic>
, <italic>Nitrospira</italic>
, <italic>Alteromondaceae</italic>
, and SAR11, SAR202 and Agg47 bacterial clades (<xref ref-type="bibr" rid="b5">DeLong <italic>et al.</italic>
, 2006</xref>
); these microbial communities were enriched in genes encoding transposases, pilus synthesis, protein transport, polysaccharide and antibiotic synthesis, the glyoxylate cycle, and urea metabolism, relative to surface communities. The warmer (14°C) deep Mediterranean waters contained mainly Proteobacteria, but also Actinobacteria, Firmicutes, Planctomycetales, Chloroflexi, Bacteroidetes, Acidobacteria, and also Crenarchaeota (<xref ref-type="bibr" rid="b21">Martin‐Cuadrado <italic>et al.</italic>
, 2007</xref>
). Enriched functional categories were again for pilus, polysaccharide and antibiotic synthesis, as well as peptide and amino acid transporters, while genes involved in degradation of complex biopolymers and xenobiotics were also abundant. The high percentage of genes encoding dehydrogenases, and among them <italic>cox</italic>
genes, suggested that aerobic CO oxidation may play a role in deep seas as additional energy source.</p>
<p>The marine subsurface at great depths is a distinct microbial habitat. Metagenomics analysis (GS20 pyrosequencing) of ng amounts of DNA extracted from 1–50 m below the seafloor at an Ocean Drilling Program Site (seafloor depth is 1229 m) on the Peru Margin showed that only ∼10% of the sequences had a detectable homology to known sequences (<xref ref-type="bibr" rid="b3">Biddle <italic>et al.</italic>
, 2008</xref>
). Archaea, and particularly Crenachaeota, appear to be the dominant microbes in these environments, and could be a source of as yet completely undiscovered enzymes with unique properties.</p>
</sec>
<sec><title>Discovery of novel enzymes from deep‐sea microbes</title>
<p>Marine enzyme biotechnology can offer novel biocatalysts with properties like high salt tolerance, hyperthermostability, barophilicity, cold adaptivity, and ease in large‐scale cultivation (reviewed by <xref ref-type="bibr" rid="b6">Debashish <italic>et al.</italic>
, 2005</xref>
). Metagenomics strategies are powerful tools to identify enzymes with novel biocatalytic properties from unculturable members of microbial communities (<xref ref-type="bibr" rid="b9">Ferrer <italic>et al.</italic>
, 2009</xref>
; <xref ref-type="bibr" rid="b31">Steele <italic>et al.</italic>
, 2009</xref>
). The GOS project discovered hundreds of truly novel protein and enzyme families from marine surface microbes for which no function is yet known (<xref ref-type="bibr" rid="b41">Yooseph <italic>et al.</italic>
, 2007</xref>
). Deep‐sea and sediment microbes should provide an enormous reservoir of low‐temperature and high‐pressure adapted enzymes. Both sequence‐based and function‐based screening approaches have been used to identify enzymes with potentially interesting biocatalytic activities from cultured deep‐sea microbes as well as uncultured metagenomes (<xref ref-type="bibr" rid="b17">Kennedy <italic>et al.</italic>
, 2008</xref>
; <xref ref-type="bibr" rid="b19">Kobayashi <italic>et al.</italic>
, 2008</xref>
) (<xref ref-type="table" rid="t2">Table 2</xref>
).</p>
<table-wrap id="t2" position="float"><label>Table 2</label>
<caption><p>Enzymes from deep‐sea microbes.</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1">Enzyme(s)</th>
<th align="left" rowspan="1" colspan="1">Producing organism(s)</th>
<th align="left" rowspan="1" colspan="1">Isolation</th>
<th align="left" rowspan="1" colspan="1">Reference</th>
</tr>
</thead>
<tbody><tr><td align="left" rowspan="1" colspan="1">α‐Amylase</td>
<td align="left" rowspan="1" colspan="1"><italic>Nocardiopsis</italic>
sp.</td>
<td align="left" rowspan="1" colspan="1">Deep sea sediment</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b44">Zhang and Zeng (2008</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Alkane hydroxylases</td>
<td align="left" rowspan="1" colspan="1">Metagenome</td>
<td align="left" rowspan="1" colspan="1">Deep‐sea sediment</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b39">Xu <italic>et al.</italic>
(2008</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">β‐Lactamases</td>
<td align="left" rowspan="1" colspan="1"><italic>Metagenome</italic>
</td>
<td align="left" rowspan="1" colspan="1">Cold‐seep sediment of seamount</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b30">Song <italic>et al.</italic>
(2005</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Cellulase</td>
<td align="left" rowspan="1" colspan="1"><italic>Pseudoaltermonas</italic>
sp. DY3</td>
<td align="left" rowspan="1" colspan="1">Deep‐sea sediment</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b42">Zeng <italic>et al.</italic>
(2006</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Esterases</td>
<td align="left" rowspan="1" colspan="1">Metagenome</td>
<td align="left" rowspan="1" colspan="1">Deep‐sea hypersaline anoxic basin</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b9">Ferrer <italic>et al.</italic>
(2005</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Esterase (alkaline)</td>
<td align="left" rowspan="1" colspan="1">Metagenome</td>
<td align="left" rowspan="1" colspan="1">Deep‐sea sediment</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b24">Park <italic>et al.</italic>
(2007</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Lipase</td>
<td align="left" rowspan="1" colspan="1">Metagenome</td>
<td align="left" rowspan="1" colspan="1">Deep‐sea sediment</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b12">Hardeman and Sjoling (2007</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Lipase</td>
<td align="left" rowspan="1" colspan="1">Metagenome</td>
<td align="left" rowspan="1" colspan="1">Deep‐sea sediment</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b15">Jeon <italic>et al.</italic>
(2009</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Quinol oxidase</td>
<td align="left" rowspan="1" colspan="1"><italic>Shewanella</italic>
sp. strain DB‐172F</td>
<td align="left" rowspan="1" colspan="1">Deep‐sea sediment</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b25">Qureshi <italic>et al.</italic>
(1998</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Protease (alkaline)</td>
<td align="left" rowspan="1" colspan="1"><italic>Pseudomonas strain</italic>
DY‐A</td>
<td align="left" rowspan="1" colspan="1">Deep‐sea sediment</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b43">Zeng <italic>et al.</italic>
(2003</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Proteases (neutral, alkaline)</td>
<td align="left" rowspan="1" colspan="1"><italic>Pseudoaltermonas</italic>
sp.</td>
<td align="left" rowspan="1" colspan="1">Deep‐sea sediment</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b38">Xiong <italic>et al.</italic>
(2007</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Protease (alkaline)</td>
<td align="left" rowspan="1" colspan="1"><italic>Pseudoaltermonas</italic>
sp. SM9913</td>
<td align="left" rowspan="1" colspan="1">Deep‐sea sediment</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b4">Chen <italic>et al.</italic>
(2007</xref>
)</td>
</tr>
<tr><td align="left" rowspan="1" colspan="1">Various</td>
<td align="left" rowspan="1" colspan="1">Metagenome</td>
<td align="left" rowspan="1" colspan="1">Deep sub‐seafloor sediment core</td>
<td align="left" rowspan="1" colspan="1"><xref ref-type="bibr" rid="b19">Kobayashi <italic>et al.</italic>
(2008</xref>
)</td>
</tr>
</tbody>
</table>
<table-wrap-foot><fn><p>Adapted from <xref ref-type="bibr" rid="b17">Kennedy and colleagues (2008</xref>
).</p>
</fn>
</table-wrap-foot>
</table-wrap>
<p>For instance, highly salt‐tolerant and pressure‐tolerant esterases were identified in a metagenome expression library generated from microbes isolated from a deep‐sea hypersaline anoxic basin in the Eastern Mediterranean (<xref ref-type="bibr" rid="b8">Ferrer <italic>et al.</italic>
, 2005</xref>
). The amino acid content of proteins in psychrophilic piezophiles is also different from that in mesophiles. There are more polar amino acids in the proteins, resulting in a loss of rigidity and increased structural flexibility for enhanced catalytic activity. The adaptive properties of psychrophilic enzymes are high specific activity, relatively low temperature optima and high thermolability (<xref ref-type="bibr" rid="b10">Gomes and Steiner, 2004</xref>
).</p>
<p>A major challenge will be to develop alternative hosts and their associated vectors for heterologous expression of genes from the diverse phyla existing in the deep‐sea ecosystem (<xref ref-type="bibr" rid="b9">Ferrer <italic>et al.</italic>
, 2009</xref>
).</p>
</sec>
<sec><title>Applications</title>
<p>Cold‐adapted enzymes are advantageous for waste decomposition in cold environments, for food processing, flavour enhancement (<xref ref-type="bibr" rid="b13">He <italic>et al.</italic>
, 2004</xref>
) and preservation, and for processes that require the rapid inactivation of enzymatic reactions (<xref ref-type="bibr" rid="b14">Huston <italic>et al.</italic>
, 2000</xref>
; <xref ref-type="bibr" rid="b23">O'Brien <italic>et al.</italic>
, 2004</xref>
). Piezophilic enzymes could be useful for food sterilization at high pressure and low temperature, improving preservation of flavour and colour. Halophilic enzymes can be applied for non‐aquatic reactions, as they have better thermostability and other unique properties in organic solvents, and could be used in anti‐fouling coating and paint industries (<xref ref-type="bibr" rid="b40">Yebra <italic>et al.</italic>
, 2004</xref>
), but also for synthesis of optically active substances. Finally, many deep‐sea bacteria can synthesize interesting chemical compounds, such as omega‐3 polyunsaturated fatty acids that are considered useful in reducing the risk of cardiovascular disease, and polyketides (<xref ref-type="bibr" rid="b27">Siezen and Khayatt, 2008</xref>
) which could be used as novel antibiotics.</p>
</sec>
</body>
<back><ack><p>This project was carried out within the research programme of the Kluyver Centre for Genomics of Industrial Fermentation which is part of the Netherlands Genomics Initiative/Netherlands Organization for Scientific Research.</p>
</ack>
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