The structure of sirohydrochlorin I, a dimethylisobacteriochlorin derived from uroporphyrinogen I
Abstract
Purified S-adenosyl-L-methionine: uroporphyrinogen (uro'gen) III methyl transferase (SUMT), the first methylase of the vitamin B12 pathway (from Pseudomonas denitrificans), synthesizes a type I isomer of sirohydrochlorin from uro'gen I (1).