Radioactivity from [14C]glycolaldehyde enters pyridoxal phosphate specifically, and is confined to the two-carbon unit C(5)–C(5′). Glycolaldehyde enters as an intact two-carbon unit, the aldehyde carbon atom supplying C-5, and the carbinol carbon atom C-5′ of the vitamin. These observations are interpreted in terms of the early stages of the biosynthesis of vitamin B6.
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Hill et al. (1975) studied this question.
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