Abstract
Purified methyl-CoM reductase of Methanobacterium thermoautotrophicum (strain Marburg) catalyzed the reduction of methyl-CoM to methane with reduced cobalamin, when either synthetic 7-mercaptoheptanoyl-threonine phosphate (HS-HTP) or naturally occurring component B was present. With both compounds the same maximal specific acitivity was obtained and ATP was neither required nor stimulatory. These findings indicate that HS-HTP functions as component B and do not support the idea that HS-HT is only active in an adenosine monophosphorylated form.
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