Methylated-thiol-coenzyme M methyltransferase

Methylated-thiol-coenzyme M methyltransferase (EC 2.1.1.251, mtsA (gene)) is an enzyme with systematic name methylated-thiol:coenzyme M methyltransferase.^[1]^[2]^[3] This enzyme catalyses the following chemical reaction

\rightleftharpoons

methyl-CoM + hydrogen sulfide (overall reaction)

(1a) methanethiol + [Co(I) methylated-thiol-specific corrinoid protein]

\rightleftharpoons

[methyl-Co(III) methylated-thiol-specific corrinoid protein] + hydrogen sulfide

(1b) [methyl-Co(III) methylated-thiol-specific corrinoid protein] + coenzyme M

\rightleftharpoons

methyl-CoM + [Co(I) methylated-thiol-specific corrinoid protein]

This enzyme involved in methanogenesis from methylated thiols, such as methane thiol, dimethyl sulfide, and 3-S-methylmercaptopropionate.

References

↑ Paul, L.; Krzycki, J.A. (1996). "Sequence and transcript analysis of a novel Methanosarcina barkeri methyltransferase II homolog and its associated corrinoid protein homologous to methionine synthase". J. Bacteriol. 178: 6599–6607. PMID 8932317.
↑ Tallant, T.C.; Krzycki, J.A. (1997). "Methylthiol:coenzyme M methyltransferase from Methanosarcina barkeri, an enzyme of methanogenesis from dimethylsulfide and methylmercaptopropionate". J. Bacteriol. 179: 6902–6911. PMID 9371433.
↑ Tallant, T.C.; Paul, L.; Krzycki, J.A. (2001). "The MtsA subunit of the methylthiol:coenzyme M methyltransferase of Methanosarcina barkeri catalyses both half-reactions of corrinoid-dependent dimethylsulfide: coenzyme M methyl transfer". J. Biol. Chem. 276: 4485–4493. doi:10.1074/jbc.m007514200. PMID 11073950.

Transferase: one carbon transferases (EC 2.1)

N-	Histamine N-methyltransferase Phenylethanolamine N-methyltransferase Amine N-methyltransferase Phosphatidylethanolamine N-methyltransferase

O-	5-hydroxyindole-O-methyltransferase/Acetylserotonin O-methyltransferase Catechol-O-methyl transferase

Homocysteine	Betaine-homocysteine methyltransferase Homocysteine methyltransferase Methionine synthase

Other	Phosphatidyl ethanolamine methyltransferase DNMT3B Histone methyltransferase Thymidylate synthase DNA methyltransferase Thiopurine methyltransferase

Hydroxymethyltransferase	Serine hydroxymethyltransferase 3-methyl-2-oxobutanoate hydroxymethyltransferase

Formyltransferase	Phosphoribosylglycinamide formyltransferase Inosine monophosphate synthase

Other	Glutamate formimidoyltransferase Aminomethyltransferase

Carboxy	methylmalonyl-CoA carboxytransferase

Carbamoyl	Aspartate carbamoyltransferase Ornithine carbamoyltransferase Oxamate carbamoyltransferase Putrescine carbamoyltransferase 3-hydroxymethylcephem carbamoyltransferase Lysine carbamoyltransferase N-acetylornithine carbamoyltransferase

Enzymes

Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Enzyme kinetics Lineweaver–Burk plot Michaelis–Menten kinetics

Regulation	Allosteric regulation Cooperativity Enzyme inhibitor

Classification	EC number Enzyme superfamily Enzyme family List of enzymes

Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list)

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