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alpha-Methylacyl-CoA racemase (AMACR;double dagger P504S) catalysed exchange of straight-chain fatty acyl-CoA alpha-protons. One alpha-proton was removed in each catalytic cycle, with the pro-S proton preferred. This reaction was most efficient for straight-chain substrates with longer side-chains. 2-Methyldecanoyl-CoA underwent alpha-proton exchange 3x more efficiently (as judged by K-cat/K-m) than decanoyl-CoA.