Cytochrome c biogenesis ATP-binding export protein
CcmA, the ATP-binding component of the bacterial CcmAB transporter. The CCM family is involved in bacterial cytochrome c biogenesis. Cytochrome c maturation in E. coli requires the ccm operon, which encodes eight membrane proteins (CcmABCDEFGH). CcmE is a periplasmic heme chaperon that binds heme covalently and transfers it onto apocytochrome c in the presence of CcmF, CcmG, and CcmH. The CcmAB proteins represent an ABC transporter and the CcmCD proteins participate in heme transfer to CcmE.
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