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Proteome Remodeling in Response to Sulfur Limitation in “ Candidatus Pelagibacter ubique”

Journal Article · · mSystems
 [1];  [2];  [1];  [2];  [2];  [2];  [1];
  1. Department of Microbiology, Oregon State University, Corvallis, Oregon, USA
  2. Biological Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, USA

“ Ca . Pelagibacter ubique” is a key driver of marine biogeochemistry cycles and a model for understanding how minimal genomes evolved in free-living anucleate organisms. This study explores the unusual sulfur acquisition strategy that has evolved in these cells, which lack assimilatory sulfate reduction and instead rely on reduced sulfur compounds found in oxic marine environments to meet their cellular quotas. Our findings demonstrate that the sulfur acquisition systems are constitutively expressed but the enzymatic steps leading to the essential sulfur-containing amino acid methionine are regulated by a unique array of riboswitches and genes, many of which are encoded in a rapidly evolving genome region. These findings support mounting evidence that streamlined cells have evolved regulatory mechanisms that minimize transcriptional switching and, unexpectedly, localize essential sulfur acquisition genes in a genome region normally associated with adaption to environmental variation.

Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1618364
Alternate ID(s):
OSTI ID: 1342322
Journal Information:
mSystems, Journal Name: mSystems Journal Issue: 4 Vol. 1; ISSN 2379-5077
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English

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