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PMID: 25053816 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Metaproteomics reveals differential modes of metabolic coupling among ubiquitous oxygen minimum zone microbes.

Proceedings of the National Academy of Sciences of the United States of America ·Vol. 111 ·No. 31 ·2014-08-05 ·Pages 11395-400

Hawley AK, Brewer HM, Norbeck AD, Paša-Tolić L, Hallam SJ

Abstract

Marine oxygen minimum zones (OMZs) are intrinsic water column features arising from respiratory oxygen demand during organic matter degradation in stratified waters. Currently OMZs are expanding due to global climate change with resulting feedback on marine ecosystem function. Here we use metaproteomics to chart spatial and temporal patterns of gene expression along defined redox gradients in a seasonally stratified fjord to better understand microbial community responses to OMZ expansion. The expression of metabolic pathway components for nitrification, anaerobic ammonium oxidation (anammox), denitrification, and inorganic carbon fixation were differentially expressed across the redoxcline and covaried with distribution patterns of ubiquitous OMZ microbes including Thaumarchaeota, Nitrospina, Nitrospira, Planctomycetes, and SUP05/ARCTIC96BD-19 Gammaproteobacteria. Nitrification and inorganic carbon fixation pathways affiliated with Thaumarchaeota dominated dysoxic waters, and denitrification, sulfur oxidation, and inorganic carbon fixation pathways affiliated with the SUP05 group of nitrate-reducing sulfur oxidizers dominated suboxic and anoxic waters. Nitrifier nitrite oxidation and anammox pathways affiliated with Nirospina, Nitrospira, and Planctomycetes, respectively, also exhibited redox partitioning between dysoxic and suboxic waters. The numerical abundance of SUP05 proteins mediating inorganic carbon fixation under anoxic conditions suggests that SUP05 will become increasingly important in global ocean carbon and nutrient cycling as OMZs expand.

MeSH Terms
Archaea/genetics,metabolism Bacteria/genetics,metabolism Cluster Analysis Ecosystem Energy Metabolism Gene Expression Profiling Gene Expression Regulation, Archaeal Gene Expression Regulation, Bacterial Genes, Archaeal Genes, Bacterial Models, Biological Nitrogen/metabolism Oxidation-Reduction Oxygen/metabolism Proteome/metabolism Proteomics/methods Sulfur/metabolism Water/chemistry
Chemicals
Proteome Water Sulfur Nitrogen Oxygen
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Hawley Alyse K
Department of Microbiology and Immunology.
Brewer Heather M
Biological and Computational Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352.
Norbeck Angela D
Biological and Computational Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352.
Paša-Tolić Ljiljana
Biological and Computational Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352.
Hallam Steven J
Department of Microbiology and Immunology,Graduate Program in Bioinformatics, andGenome Sciences and Technology Training Program, University of British Columbia, Vancouver, BC, Canada V6T 1Z3; and [email protected].
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
1091-6490
Published
2014-08-05
Epub
2014-00-22
Pages
11395-400
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC4128106
Subset
IM
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