A novel trimethyl pyrrocorphin has been synthesized from 5-aminolevulinic acid (ALA) by the combination of the enzymes ALA dehydratase, porphobilinogen deaminase, uro'gen III synthase, and uro'gen III methylase, leading to a new concept for the synthesis of intermediates of vitamin B12 biosynthesis.
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Scott et al. (1990) studied this question.
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