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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">A <italic>pthA</italic> Homolog from <italic>Xanthomonas axonopodis</italic> pv. citri Responsible for Host-Specific Suppression of Virulence<xref ref-type="fn" rid="fn1">▿</xref> </title><author><name sortKey="Shiotani, Hiroshi" sort="Shiotani, Hiroshi" uniqKey="Shiotani H" first="Hiroshi" last="Shiotani">Hiroshi Shiotani</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author><author><name sortKey="Fujikawa, Takashi" sort="Fujikawa, Takashi" uniqKey="Fujikawa T" first="Takashi" last="Fujikawa">Takashi Fujikawa</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author><author><name sortKey="Ishihara, Hiromichi" sort="Ishihara, Hiromichi" uniqKey="Ishihara H" first="Hiromichi" last="Ishihara">Hiromichi Ishihara</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author><author><name sortKey="Tsuyumu, Sinji" sort="Tsuyumu, Sinji" uniqKey="Tsuyumu S" first="Sinji" last="Tsuyumu">Sinji Tsuyumu</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author><author><name sortKey="Ozaki, Katsumi" sort="Ozaki, Katsumi" uniqKey="Ozaki K" first="Katsumi" last="Ozaki">Katsumi Ozaki</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">17293422</idno><idno type="pmc">1855842</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1855842</idno><idno type="RBID">PMC:1855842</idno><idno type="doi">10.1128/JB.01790-06</idno><date when="2007">2007</date><idno type="wicri:Area/Pmc/Corpus">000772</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">A <italic>pthA</italic> Homolog from <italic>Xanthomonas axonopodis</italic> pv. citri Responsible for Host-Specific Suppression of Virulence<xref ref-type="fn" rid="fn1">▿</xref> </title><author><name sortKey="Shiotani, Hiroshi" sort="Shiotani, Hiroshi" uniqKey="Shiotani H" first="Hiroshi" last="Shiotani">Hiroshi Shiotani</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author><author><name sortKey="Fujikawa, Takashi" sort="Fujikawa, Takashi" uniqKey="Fujikawa T" first="Takashi" last="Fujikawa">Takashi Fujikawa</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author><author><name sortKey="Ishihara, Hiromichi" sort="Ishihara, Hiromichi" uniqKey="Ishihara H" first="Hiromichi" last="Ishihara">Hiromichi Ishihara</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author><author><name sortKey="Tsuyumu, Sinji" sort="Tsuyumu, Sinji" uniqKey="Tsuyumu S" first="Sinji" last="Tsuyumu">Sinji Tsuyumu</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author><author><name sortKey="Ozaki, Katsumi" sort="Ozaki, Katsumi" uniqKey="Ozaki K" first="Katsumi" last="Ozaki">Katsumi Ozaki</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author></analytic><series><title level="j">Journal of Bacteriology</title><idno type="ISSN">0021-9193</idno><idno type="eISSN">1098-5530</idno><imprint><date when="2007">2007</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Strains of the plant-pathogenic bacterium <italic>Xanthomonas axonopodis</italic> pv. citri are differentiated into two groups with respect to aggressiveness (normal and weak) on <italic>Citrus grandis</italic> cultivars but not on other <italic>Citrus</italic> species such as <italic>Citrus sinensis</italic>. Random mutagenesis using the transposon Tn<italic>5</italic> in <italic>X. axonopodis</italic> pv. citri strain KC21, which showed weak aggressiveness on a <italic>C. grandis</italic> cultivar, was used to isolate mutant KC21T46, which regained a normal level of aggressiveness on the cultivar. The gene inactivated by the transposon, <italic>hssB3.0</italic>, was shown to be responsible for the suppression of virulence on <italic>C. grandis</italic>. Sequence analysis revealed it to be a new member of the <italic>pthA</italic> homologs, which was almost identical in sequence to the other homologs except for the number of tandem repeats in the central region of the gene. <italic>hssB3.0</italic> appears to be a chimera of other <italic>pthA</italic> homologs, <italic>pB3.1</italic> and <italic>pB3.7</italic>, and could have been generated by recombination between these two genes. Importantly, in <italic>X. axonopodis</italic> pv. citri, <italic>hssB3.0</italic> was found in all of the tested isolates belonging to the weakly aggressive group but not in the isolates of the normally aggressive group. Isolation of the virulence-deficient mutant KC21T14 from KC21, in which the pathogenicity gene <italic>pthA-KC21</italic> was disrupted, showed that <italic>hssB3.0</italic> induces a defense response on the host but partially interrupts canker development elicited by the pathogenicity gene in this bacterium.</p></div></front></TEI><pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">J Bacteriol</journal-id><journal-id journal-id-type="publisher-id">jb</journal-id><journal-title>Journal of Bacteriology</journal-title><issn pub-type="ppub">0021-9193</issn><issn pub-type="epub">1098-5530</issn><publisher><publisher-name>American Society for Microbiology</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">17293422</article-id><article-id pub-id-type="pmc">1855842</article-id><article-id pub-id-type="publisher-id">1790-06</article-id><article-id pub-id-type="doi">10.1128/JB.01790-06</article-id><article-categories><subj-group subj-group-type="heading"><subject>Plant Microbiology</subject></subj-group></article-categories><title-group><article-title>A <italic>pthA</italic> Homolog from <italic>Xanthomonas axonopodis</italic> pv. citri Responsible for Host-Specific Suppression of Virulence<xref ref-type="fn" rid="fn1">▿</xref> </article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Shiotani</surname><given-names>Hiroshi</given-names></name><xref ref-type="aff" rid="aff1">1</xref><xref ref-type="corresp" rid="cor1">*</xref></contrib><contrib contrib-type="author"><name><surname>Fujikawa</surname><given-names>Takashi</given-names></name><xref ref-type="aff" rid="aff1">2</xref></contrib><contrib contrib-type="author"><name><surname>Ishihara</surname><given-names>Hiromichi</given-names></name><xref ref-type="aff" rid="aff1">2</xref></contrib><contrib contrib-type="author"><name><surname>Tsuyumu</surname><given-names>Sinji</given-names></name><xref ref-type="aff" rid="aff1">2</xref></contrib><contrib contrib-type="author"><name><surname>Ozaki</surname><given-names>Katsumi</given-names></name><xref ref-type="aff" rid="aff1">3</xref></contrib></contrib-group><aff id="aff1">Department of Citrus Research, National Institute of Fruit Tree Science, Nagasaki,<label>1</label> Faculty of Agriculture, Shizuoka University, Shizuoka,<label>2</label> Faculty of Horticulture, Minami Kyushu University, Miyazaki, Japan<label>3</label></aff><author-notes><fn id="cor1"><label>*</label><p>Corresponding author. Mailing address: Department of Citrus Research, National Institute of Fruit Tree Science, Otsu 954, Kuchinotsu, Nagasaki 859-2501, Japan. Phone: 81 (957) 86-4498. Fax: 81 (957) 86-4268. E-mail: <email>hiroshi@affrc.go.jp</email></p></fn></author-notes><pub-date pub-type="ppub"><month>4</month><year>2007</year></pub-date><pub-date pub-type="epub"><day>9</day><month>2</month><year>2007</year></pub-date><volume>189</volume><issue>8</issue><fpage>3271</fpage><lpage>3279</lpage><history><date date-type="received"><day>27</day><month>11</month><year>2006</year></date><date date-type="accepted"><day>31</day><month>1</month><year>2007</year></date></history><copyright-statement>Copyright © 2007, American Society for Microbiology</copyright-statement><copyright-year>2007</copyright-year><self-uri xlink:title="pdf" xlink:href="zjb00807003271.pdf"></self-uri><abstract><p>Strains of the plant-pathogenic bacterium <italic>Xanthomonas axonopodis</italic> pv. citri are differentiated into two groups with respect to aggressiveness (normal and weak) on <italic>Citrus grandis</italic> cultivars but not on other <italic>Citrus</italic> species such as <italic>Citrus sinensis</italic>. Random mutagenesis using the transposon Tn<italic>5</italic> in <italic>X. axonopodis</italic> pv. citri strain KC21, which showed weak aggressiveness on a <italic>C. grandis</italic> cultivar, was used to isolate mutant KC21T46, which regained a normal level of aggressiveness on the cultivar. The gene inactivated by the transposon, <italic>hssB3.0</italic>, was shown to be responsible for the suppression of virulence on <italic>C. grandis</italic>. Sequence analysis revealed it to be a new member of the <italic>pthA</italic> homologs, which was almost identical in sequence to the other homologs except for the number of tandem repeats in the central region of the gene. <italic>hssB3.0</italic> appears to be a chimera of other <italic>pthA</italic> homologs, <italic>pB3.1</italic> and <italic>pB3.7</italic>, and could have been generated by recombination between these two genes. Importantly, in <italic>X. axonopodis</italic> pv. citri, <italic>hssB3.0</italic> was found in all of the tested isolates belonging to the weakly aggressive group but not in the isolates of the normally aggressive group. Isolation of the virulence-deficient mutant KC21T14 from KC21, in which the pathogenicity gene <italic>pthA-KC21</italic> was disrupted, showed that <italic>hssB3.0</italic> induces a defense response on the host but partially interrupts canker development elicited by the pathogenicity gene in this bacterium.</p></abstract></article-meta></front></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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