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The specificity toward substrate analogs of the first two methyltransferases in the vitamin B 12 biosynthetic pathway was probed with 15 synthetic porphyrinogens. Several novel methylated chlorins and isobacteriochlorins were isolated and characterized, suggesting the same methylation sequence C-2>C-7>C-20 as for the natural substrate, uro’gen III. The results allow us to narrow down...
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