betaine reductase EC#: 1.21.4.4; ChemWhat Code: 1376091
| Product Name | betaine reductase |
| Example Structure |  |
| Synonyms | reductase, betaine |
| EC Number | 1.21.4.4 |
| CAS Registry Number | |
| Comments | The reaction is observed only in the direction of betaine reduction. The enzyme from Eubacterium acidaminophilum consists of subunits A, B and C. Subunit B contains selenocysteine and a pyruvoyl group, and is responsible for betaine binding and trimethylamine release. Subunit A, which also contains selenocysteine, is reduced by thioredoxin, and is needed to convert the carboxymethyl group into a ketene equivalent, in turn used by subunit C to produce acetyl phosphate. Only subunit B distinguishes this enzyme from EC 1.21.4.2 (glycine reductase) and EC 1.21.4.3 (sarcosine reductase). |
| Cofactor | |
| History | |
| Reactions | Acetyl phosphate + trimethylamine + thioredoxin disulfide + H(2)O = betaine + phosphate + thioredoxin. |
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