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CbiX/SirB N-terminal domain-containing protein
The function of CbiX is uncertain, however it is found in cobalamin biosynthesis operons and so may have a related function. Some CbiX proteins contain a striking histidine-rich region at their C-terminus, which suggests that it might be involved in metal chelation [1]. [1]. 9742225. Cobalamin (vitamin B12) biosynthesis: identification and characterization of a Bacillus megaterium cobI operon. Raux E, Lanois A, Warren MJ, Rambach A, Thermes C;. Biochem J 1998;335:159-166. (from Pfam)
sirohydrochlorin chelatase
sirohydrochlorin chelatase catalyzes the ferro-/cobalt- chelation of sirohydrochlorin to siroheme or cobalt-sirohydrochlorin
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