ジャーナル: Nat Commun / 年: 2023 タイトル: Architecture of the Heme-translocating CcmABCD/E complex required for Cytochrome c maturation. 著者: Lorena Ilcu / Lukas Denkhaus / Anton Brausemann / Lin Zhang / Oliver Einsle / 要旨: Mono- and multiheme cytochromes c are post-translationally matured by the covalent attachment of heme. For this, Escherichia coli employs the most complex type of maturation machineries, the Ccm- ...Mono- and multiheme cytochromes c are post-translationally matured by the covalent attachment of heme. For this, Escherichia coli employs the most complex type of maturation machineries, the Ccm-system (for cytochrome c maturation). It consists of two membrane protein complexes, one of which shuttles heme across the membrane to a mobile chaperone that then delivers the cofactor to the second complex, an apoprotein:heme lyase, for covalent attachment. Here we report cryo-electron microscopic structures of the heme translocation complex CcmABCD from E. coli, alone and bound to the heme chaperone CcmE. CcmABCD forms a heterooctameric complex centered around the ABC transporter CcmAB that does not by itself transport heme. Our data suggest that the complex flops a heme group from the inner to the outer leaflet at its CcmBC interfaces, driven by ATP hydrolysis at CcmA. A conserved heme-handling motif (WxWD) at the periplasmic side of CcmC rotates the heme by 90° for covalent attachment to the heme chaperone CcmE that we find interacting exclusively with the CcmB subunit.
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a: Cytochrome c biogenesis ATP-binding export protein CcmA b: Heme exporter protein B c: Heme exporter protein C d: Heme exporter protein D A: Cytochrome c biogenesis ATP-binding export protein CcmA B: Heme exporter protein B C: Heme exporter protein C D: Heme exporter protein D