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Vitamin B12.
Abstract The biosynthesis of B12, involving up to 30 different enzyme-mediated steps, only occurs in bacteria. Thus, most eukaryotes require an external source of B12, and yet the vitamin appears to have only two functions in eukaryotes: as a cofactor for the enzymes methionine synthase and methylmalonylCoA mutase. These two functions are crucial for normal health in humans, and in particular, the formation of methionine is essential for providing methyl groups for over 100 methylation processes. Interference with the methionine synthase reaction not only depletes the body of methyl groups but also leads to the ac...
Source: Advances in Food and Nutrition Research - February 27, 2018 Category: Nutrition Authors: Smith AD, Warren MJ, Refsum H Tags: Adv Food Nutr Res Source Type: research