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High wax ester and triacylglycerol biosynthesis potential in coastal sediments of Antarctic and Subantarctic environments

Journal Article · · PLoS ONE
 [1];  [1];  [2];  [2];  [3];  [1];  [4];  [2];  [1];  [5]
  1. National Scientific and Technical Research Council (CONICET) (Argentina). Institute of Molecular and Cellular Biology of Rosario
  2. National Scientific and Technical Research Council (CONICET) (Argentina). Institute of Biosciences of Patagonia (INBIOP)
  3. National Scientific and Technical Research Council (CONICET) (Argentina). Institute of Biology of Marine Organisms (IBIOMAR)
  4. National Scientific and Technical Research Council (CONICET) (Argentina). Institute of Nanobiotechnology (NANOBIOTEC); Argentine Antarctic Institute (IAA) (Argentina)
  5. National Scientific and Technical Research Council (CONICET) (Argentina). Center for the Study of Marine Systems (CESIMAR)

The wax ester (WE) and triacylglycerol (TAG) biosynthetic potential of marine microorganisms is poorly understood at the microbial community level. The goal of this work was to uncover the prevalence and diversity of bacteria with the potential to synthesize these neutral lipids in coastal sediments of two high latitude environments, and to characterize the gene clusters related to this process. Homolog sequences of the key enzyme, the wax ester synthase/acyl-CoA:diacylglycerol acyltransferase (WS/DGAT) were retrieved from 13 metagenomes, including subtidal and intertidal sediments of a Subantarctic environment (Ushuaia Bay, Argentina), and subtidal sediments of an Antarctic environment (Potter Cove, Antarctica). The abundance of WS/DGAT homolog sequences in the sediment metagenomes was 1.23 ± 0.42 times the abundance of 12 single-copy genes encoding ribosomal proteins, higher than in seawater (0.13 ± 0.31 times in 338 metagenomes). Homolog sequences were highly diverse, and were assigned to the Pseudomonadota, Actinomycetota, Bacteroidota and Acidobacteriota phyla. The genomic context of WS/DGAT homologs included sequences related to WE and TAG biosynthesis pathways, as well as to other related pathways such as fatty-acid metabolism, suggesting carbon recycling might drive the flux to neutral lipid synthesis. These results indicate the presence of abundant and taxonomically diverse bacterial populations with the potential to synthesize lipid storage compounds in marine sediments, relating this metabolic process to bacterial survival.

Research Organization:
USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2422817
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 7 Vol. 18; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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