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Information on EC 4.99.1.3 - sirohydrochlorin cobaltochelatase

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IUBMB Comments
This enzyme is a type II chelatase, being either a monomer (CbiX) or a homodimer (CibK) and being ATP-independent. CbiK from Salmonella enterica uses precorrin-2 as the substrate to yield cobalt-precorrin-2. The enzyme contains two histidines at the active site that are thought to be involved in the deprotonation of the tetrapyrrole substrate as well as in metal binding. CbiX from Bacillus megaterium inserts cobalt at the level of sirohydrochlorin (factor-II) rather than precorrin-2.
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Word Map
The expected taxonomic range for this enzyme is: Archaea, Bacteria
Synonyms
cobalt chelatase, cbixl, cbixs, sirohydrochlorin-ferrochelatase, anaerobic cobalt chelatase, archaeal cobaltochelatase, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
cobalt-sirohydrochlorin + 2 H+ = sirohydrochlorin + Co2+
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