skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Functional interactions between posttranslationally modified amino acids of methyl-coenzyme M reductase in Methanosarcina acetivorans

Journal Article · · PLoS Biology (Online)

The enzyme methyl-coenzyme M reductase (MCR) plays an important role in mediating global levels of methane by catalyzing a reversible reaction that leads to the production or consumption of this potent greenhouse gas in methanogenic and methanotrophic archaea. In methanogenic archaea, the alpha subunit of MCR (McrA) typically contains four to six posttranslationally modified amino acids near the active site. Recent studies have identified enzymes performing two of these modifications (thioglycine and 5-[S]-methylarginine), yet little is known about the formation and function of the remaining posttranslationally modified residues. Here, we provide in vivo evidence that a dedicated S-adenosylmethionine-dependent methyltransferase encoded by a gene we designated methylcysteine modification (mcmA) is responsible for formation of S-methylcysteine in Methanosarcina acetivorans McrA. Phenotypic analysis of mutants incapable of cysteine methylation suggests that the S-methylcysteine residue might play a role in adaption to mesophilic conditions. To examine the interactions between the S-methylcysteine residue and the previously characterized thioglycine, 5-(S)-methylarginine modifications, we generated M. acetivorans mutants lacking the three known modification genes in all possible combinations. Phenotypic analyses revealed complex, physiologically relevant interactions between the modified residues, which alter the thermal stability of MCR in a combinatorial fashion that is not readily predictable from the phenotypes of single mutants. High-resolution crystal structures of inactive MCR lacking the modified amino acids were indistinguishable from the fully modified enzyme, suggesting that interactions between the posttranslationally modified residues do not exert a major influence on the static structure of the enzyme but rather serve to fine-tune the activity and efficiency of MCR.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-02ER15296
OSTI ID:
1603218
Alternate ID(s):
OSTI ID: 1601490; OSTI ID: 1800037
Journal Information:
PLoS Biology (Online), Journal Name: PLoS Biology (Online) Vol. 18 Journal Issue: 2; ISSN 1545-7885
Publisher:
Public Library of Science (PLoS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

References (38)

Phylogenetic and Structural Comparisons of the Three Types of Methyl Coenzyme M Reductase from Methanococcales and Methanobacteriales journal May 2017
The Biosynthesis of Methylated Amino Acids in the Active Site Region of Methyl-coenzyme M Reductase journal February 2000
Identification of a unique Radical SAM methyltransferase required for the sp3-C-methylation of an arginine residue of methyl-coenzyme M reductase journal May 2018
Methane-Oxidizing Enzymes: An Upstream Problem in Biological Gas-to-Liquids Conversion journal July 2016
Geneious Basic: An integrated and extendable desktop software platform for the organization and analysis of sequence data journal April 2012
Post-translational modifications in the active site region of methyl-coenzyme M reductase from methanogenic and methanotrophic archaea: Methanogenic archaea methyl-coenzyme M reductase journal August 2007
Wide diversity of methane and short-chain alkane metabolisms in uncultured archaea journal March 2019
Crystal Structure of Methyl-Coenzyme M Reductase: The Key Enzyme of Biological Methane Formation journal November 1997
Methyl (Alkyl)-Coenzyme M Reductases: Nickel F-430-Containing Enzymes Involved in Anaerobic Methane Formation and in Anaerobic Oxidation of Methane or of Short Chain Alkanes journal April 2019
An evolving view of methane metabolism in the Archaea journal January 2019
Elucidation of the biosynthesis of the methane catalyst coenzyme F430 journal February 2017
The key nickel enzyme of methanogenesis catalyses the anaerobic oxidation of methane journal June 2010
A 21st-century shift from fossil-fuel to biogenic methane emissions indicated by 13CH4 journal March 2016
Thermophilic archaea activate butane via alkyl-coenzyme M formation journal October 2016
Comparison of three methyl-coenzyme M reductases from phylogenetically distant organisms: unusual amino acid modification, conservation and adaptation journal October 2000
The radical mechanism of biological methane synthesis by methyl-coenzyme M reductase journal May 2016
Activation of Methyl-SCoM Reductase to High Specific Activity after Treatment of Whole Cells with Sodium Sulfide journal February 1998
Methanogenic archaea: ecologically relevant differences in energy conservation journal June 2008
Purified Methyl-Coenzyme-M Reductase is Activated when the Enzyme-Bound Coenzyme F430 is Reduced to the Nickel(I) Oxidation State by Titanium(III) Citrate journal January 1997
Didehydroaspartate Modification in Methyl-Coenzyme M Reductase Catalyzing Methane Formation journal July 2016
New perspectives on anaerobic methane oxidation journal October 2000
Divergent methyl-coenzyme M reductase genes in a deep-subseafloor Archaeoglobi journal January 2019
Different Biosynthetic Pathways to Fosfomycin in Pseudomonas syringae and Streptomyces Species journal May 2012
Metabolic manipulation of methanogens for methane machinations journal October 2016
On the mechanism of biological methane formation: structural evidence for conformational changes in methyl-coenzyme M reductase upon substrate binding journal May 2001
Structure of a methyl-coenzyme M reductase from Black Sea mats that oxidize methane anaerobically journal November 2011
Enzymatic reconstitution of ribosomal peptide backbone thioamidation journal March 2018
Asgard archaea capable of anaerobic hydrocarbon cycling journal April 2019
MUSCLE: multiple sequence alignment with high accuracy and high throughput journal March 2004
Disaggregation of Methanosarcina spp. and Growth as Single Cells at Elevated Osmolarity journal January 1993
Anaerobic oxidation of ethane by archaea from a marine hydrocarbon seep journal March 2019
The biosynthetic pathway of coenzyme F430 in methanogenic and methanotrophic archaea journal October 2016
An Anaerobic, Intrachamber Incubator for Growth ofMethanosarcina spp. on Methanol-Containing Solid Media journal January 1998
A genetic system for Archaea of the genus Methanosarcina: Liposome-mediated transformation and construction of shuttle vectors journal March 1997
Proteomic Stable Isotope Probing Reveals Biosynthesis Dynamics of Slow Growing Methane Based Microbial Communities journal April 2016
Cas9-mediated genome editing in the methanogenic archaeon Methanosarcina acetivorans journal March 2017
Anaerobic Oxidation of Methane: Progress with an Unknown Process journal October 2009
Temperature dependence of methyl-coenzyme M reductase activity and of the formation of the methyl-coenzyme M reductase red2 state induced by coenzyme B journal April 2005