Community genomic analyses constrain the distribution of metabolic traits across the Chloroflexi phylum and indicate roles in sediment carbon cycling
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- 作者：Laura A Hug (1)
Cindy J Castelle (1)
Kelly C Wrighton (1)
Brian C Thomas (1)
Itai Sharon (1)
Kyle R Frischkorn (1)
Kenneth H Williams (2)
Susannah G Tringe (3)
Jillian F Banfield (1) - 关键词：Chloroflexi ; Metagenome ; GIF9 ; Anaerolinea ; Sediment ; Dehalococcoides ; Wood ; Ljungdahl ; Acetogenesis
- 刊名：Microbiome
- 出版年：2013
- 出版时间：December 2013
- 年：2013
- 卷：1
- 期：1
- 全文大小：629KB
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Cindy J Castelle (1)
Kelly C Wrighton (1)
Brian C Thomas (1)
Itai Sharon (1)
Kyle R Frischkorn (1)
Kenneth H Williams (2)
Susannah G Tringe (3)
Jillian F Banfield (1)
1. Department of Earth and Planetary Science, UC Berkeley, Berkeley, CA, USA
2. Geophysics Department, Earth Sciences Division, Lawrence Berkeley National Lab, Berkeley, CA, USA
3. Metagenome Program, DOE Joint Genome Institute, Walnut Creek, CA, USA - ISSN：2049-2618
文摘
Background Sediments are massive reservoirs of carbon compounds and host a large fraction of microbial life. Microorganisms within terrestrial aquifer sediments control buried organic carbon turnover, degrade organic contaminants, and impact drinking water quality. Recent 16S rRNA gene profiling indicates that members of the bacterial phylum Chloroflexi are common in sediment. Only the role of the class Dehalococcoidia, which degrade halogenated solvents, is well understood. Genomic sampling is available for only six of the approximate 30 Chloroflexi classes, so little is known about the phylogenetic distribution of reductive dehalogenation or about the broader metabolic characteristics of Chloroflexi in sediment. Results We used metagenomics to directly evaluate the metabolic potential and diversity of Chloroflexi in aquifer sediments. We sampled genomic sequence from 86 Chloroflexi representing 15 distinct lineages, including members of eight classes previously characterized only by 16S rRNA sequences. Unlike in the Dehalococcoidia, genes for organohalide respiration are rare within the Chloroflexi genomes sampled here. Near-complete genomes were reconstructed for three Chloroflexi. One, a member of an unsequenced lineage in the Anaerolinea, is an aerobe with the potential for respiring diverse carbon compounds. The others represent two genomically unsampled classes sibling to the Dehalococcoidia, and are anaerobes likely involved in sugar and plant-derived-compound degradation to acetate. Both fix CO2 via the Wood-Ljungdahl pathway, a pathway not previously documented in Chloroflexi. The genomes each encode unique traits apparently acquired from Archaea, including mechanisms of motility and ATP synthesis. Conclusions Chloroflexi in the aquifer sediments are abundant and highly diverse. Genomic analyses provide new evolutionary boundaries for obligate organohalide respiration. We expand the potential roles of Chloroflexi in sediment carbon cycling beyond organohalide respiration to include respiration of sugars, fermentation, CO2 fixation, and acetogenesis with ATP formation by substrate-level phosphorylation.