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

Abstract

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.

Authors:
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
Publication Date:
Research Org.:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org.:
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)
OSTI Identifier:
1378144
Alternate Identifier(s):
OSTI ID: 1378147; OSTI ID: 1429098; OSTI ID: 1595337
Grant/Contract Number:  
FG02-02ER15296; GM097142
Resource Type:
Published Article
Journal Name:
eLife
Additional Journal Information:
Journal Name: eLife Journal Volume: 6; Journal ID: ISSN 2050-084X
Publisher:
eLife Sciences Publications, Ltd.
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; 54 ENVIRONMENTAL SCIENCES; 03 NATURAL GAS

Citation Formats

Nayak, Dipti D., Mahanta, Nilkamal, Mitchell, Douglas A., and Metcalf, William W. Post-translational thioamidation of methyl-coenzyme M reductase, a key enzyme in methanogenic and methanotrophic Archaea. United States: N. p., 2017. Web. doi:10.7554/eLife.29218.
Nayak, Dipti D., Mahanta, Nilkamal, Mitchell, Douglas A., & Metcalf, William W. Post-translational thioamidation of methyl-coenzyme M reductase, a key enzyme in methanogenic and methanotrophic Archaea. United States. https://doi.org/10.7554/eLife.29218
Nayak, Dipti D., Mahanta, Nilkamal, Mitchell, Douglas A., and Metcalf, William W. Thu . "Post-translational thioamidation of methyl-coenzyme M reductase, a key enzyme in methanogenic and methanotrophic Archaea". United States. https://doi.org/10.7554/eLife.29218.
@article{osti_1378144,
title = {Post-translational thioamidation of methyl-coenzyme M reductase, a key enzyme in methanogenic and methanotrophic Archaea},
author = {Nayak, Dipti D. and Mahanta, Nilkamal and Mitchell, Douglas A. and Metcalf, William W.},
abstractNote = {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.},
doi = {10.7554/eLife.29218},
journal = {eLife},
number = ,
volume = 6,
place = {United States},
year = {Thu Sep 07 00:00:00 EDT 2017},
month = {Thu Sep 07 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.7554/eLife.29218

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Cited by: 66 works
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