Diverse capacity for 2-methylhopanoid production correlates with a specific ecological niche
Identifieur interne : 000358 ( Main/Exploration ); précédent : 000357; suivant : 000359Diverse capacity for 2-methylhopanoid production correlates with a specific ecological niche
Auteurs : Jessica N. Ricci [États-Unis] ; Maureen L. Coleman [États-Unis] ; Paula V. Welander [États-Unis] ; Alex L. Sessions [États-Unis] ; Roger E. Summons [États-Unis] ; John R. Spear [États-Unis] ; Dianne K. Newman [États-Unis]Source :
- The ISME Journal [ 1751-7362 ] ; 2013.
Abstract
Molecular fossils of 2-methylhopanoids are prominent biomarkers in modern and ancient sediments that have been used as proxies for cyanobacteria and their main metabolism, oxygenic photosynthesis. However, substantial culture and genomic-based evidence now indicates that organisms other than cyanobacteria can make 2-methylhopanoids. Because few data directly address which organisms produce 2-methylhopanoids in the environment, we used metagenomic and clone library methods to determine the environmental diversity of
Url:
DOI: 10.1038/ismej.2013.191
PubMed: 24152713
PubMed Central: 3930323
Affiliations:
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Le document en format XML
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<front><div type="abstract" xml:lang="en"><p>Molecular fossils of 2-methylhopanoids are prominent biomarkers in modern and ancient sediments that have been used as proxies for cyanobacteria and their main metabolism, oxygenic photosynthesis. However, substantial culture and genomic-based evidence now indicates that organisms other than cyanobacteria can make 2-methylhopanoids. Because few data directly address which organisms produce 2-methylhopanoids in the environment, we used metagenomic and clone library methods to determine the environmental diversity of <italic>hpnP</italic>
, the gene encoding the C-2 hopanoid methylase. Here we show that <italic>hpnP</italic>
copies from alphaproteobacteria and as yet uncultured organisms are found in diverse modern environments, including some modern habitats representative of those preserved in the rock record. In contrast, cyanobacterial <italic>hpnP</italic>
genes are rarer and tend to be localized to specific habitats. To move beyond understanding the taxonomic distribution of environmental 2-methylhopanoid producers, we asked whether <italic>hpnP</italic>
presence might track with particular variables. We found <italic>hpnP</italic>
to be significantly correlated with organisms, metabolisms and environments known to support plant–microbe interactions (<italic>P</italic>
-value<10<sup>−6</sup>
); in addition, we observed diverse <italic>hpnP</italic>
types in closely packed microbial communities from other environments, including stromatolites, hot springs and hypersaline microbial mats. The common features of these niches indicate that 2-methylhopanoids are enriched in sessile microbial communities inhabiting environments low in oxygen and fixed nitrogen with high osmolarity. Our results support the earlier conclusion that 2-methylhopanoids are not reliable biomarkers for cyanobacteria or any other taxonomic group, and raise the new hypothesis that, instead, they are indicators of a specific environmental niche.</p>
</div>
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