Recent advances in elucidation of biological corrinoid functions |
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Authors: | Erhard Stupperich |
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Institution: | Department of Applied Microbiology, University of Ulm, Ulm, FRG |
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Abstract: | Abstract: Eleven adenosylcorrinoid-dependent rearrangements and elimination reactions have been described during the last four decades of vitamin B12 research. In contrast, only the cobamide-dependent methionine synthase was well established as a corrinoid-dependent methyl transfer reaction. Yet, investigations during the last few years revealed nine additional corrinoid-dependent methyltransferases. Many of these reactions are catalyzed by bacteria which possess a distinct C1 metabolism. Notably acetogenic and methanogenic bacteria carry out such methyl transfers in their anabolism and catabolism. Tetrahydrofolate or a similar pterine derivative is a key intermediate in these reactions. It functions as methyl acceptor and the methylated tetrahydrofolate serves as a methyl donor. |
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Keywords: | Methanogenic bacteria Acetogenic bacteria Methanol Demethylation Ether cleavage Dechlorination |
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