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Proposed reaction scheme for BciD and BchK to convert BChlide c into BChl e. BciD is proposed to act by sequential hydroxylation of the C-7 methyl group, producing 71-monohydroxy and 71-dihydroxy derivatives of BChlide c as intermediates. Spontaneous dehydration of the geminal-diol intermediate produces the 7-formyl group of BChlide e. BChlide e is esterified in vivo by BchK to produce BChl e.
