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Title: Post-translational thioamidation of methyl-coenzyme M reductase, a key enzyme in methanogenic and methanotrophic Archaea

Journal Article · · eLife
DOI:https://doi.org/10.7554/eLife.29218· OSTI ID:1378144
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States). Carl R. Woese Inst. for Genomic Biology
  2. Univ. of Illinois at Urbana-Champaign, IL (United States). Dept. of Chemistry
  3. Univ. of Illinois at Urbana-Champaign, IL (United States). Carl R. Woese Inst. for Genomic Biology and Dept. of Chemistry and Dept. of Microbiology
  4. Univ. of Illinois at Urbana-Champaign, IL (United States). Carl R. Woese Inst. for Genomic Biology and Dept. of Microbiology

Methyl-coenzyme M reductase (MCR), found in strictly anaerobic methanogenic and methanotrophic archaea, catalyzes the reversible production and consumption of the potent greenhouse gas methane. The α subunit of MCR (McrA) contains several unusual post-translational modifications, including a rare thioamidation of glycine. Based on the presumed function of homologous genes involved in the biosynthesis of thioviridamide, a thioamide-containing natural product, we hypothesized that the archaeal tfuA and ycaO genes would be responsible for post-translational installation of thioglycine into McrA. Mass spectrometric characterization of McrA from the methanogenic archaeon Methanosarcina acetivorans lacking tfuA and/or ycaO revealed the presence of glycine, rather than thioglycine, supporting this hypothesis. Phenotypic characterization of the ΔycaO-tfuA mutant revealed a severe growth rate defect on substrates with low free energy yields and at elevated temperatures (39°C - 45°C). Thus, our analyses support a role for thioglycine in stabilizing the protein secondary structure near the active site.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Institutes of Health (NIH); Simons Foundation; Life Sciences Research Foundation (LSRF)
Grant/Contract Number:
FG02-02ER15296; GM097142
OSTI ID:
1378144
Alternate ID(s):
OSTI ID: 1378147; OSTI ID: 1429098; OSTI ID: 1595337
Journal Information:
eLife, Journal Name: eLife Vol. 6; ISSN 2050-084X
Publisher:
eLife Sciences Publications, Ltd.Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 66 works
Citation information provided by
Web of Science

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