The role of 7-mercaptoheptanoylthreonine phosphate (cas 104302-77-4) in the methylcoenzyme M methylreductase system from Methanobacterium thermoautotrophicum
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Add time:08/02/2019 Source:sciencedirect.com
The structure of component B of the methylcoenzyme M methylreductase system from Methanobacterium thermoautotrophicum was recently found to be 7-mercaptoheptanoylthreonine phosphate (cas 104302-77-4) (HS-HTP). Three potential roles for this cofactor were considered. First, a methyl thioether derivative of the cofactor was synthesized to investigate its possible role as a methyl donor. This derivative was found to be incapable of acting as a substrate for methanogenesis and proved inhibitory. Secondly, an adenylated form of the cofactor was considered as the potential active form of the coenzyme. This possibility was ruled out based upon collaborative observations with Ankel-Fuchs et al. (FEBS Lett., in press) that HS-HTP is required by the methylreductase system even when ATP is not. Finally, HS-HTP was found to act as a reductant in a partially-purified methylreductase preparation that was incubated under nitrogen. The rate of methane production from HS-HTP exceeded that from other thiols or hydrogen.
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