title: Heme incorporation into the cytochrome bo3 occurs at a late stage of assembly.
abstract: Respiratory complexes in both prokaryotes and eukaryotes contain multiple co-factors, which are coordinated in defined positions so that they can function as electron wires. Intriguingly, co-factors are usually buried deep within hetero-oligomeric protein complexes and it is not clear when or how they are incorporated. In this study we show that heme is incorporated into the cytochrome bo(3) complex of Escherichia coli at a late stage of assembly. Specifically the apo-form of subunit I (the catalytic subunit) interacts with subunits III and IV before accepting heme. Assembly of subunit II is stalled until heme is incorporated.
authors.affiliation: Center for Biomembrane Research, Department of Biochemistry and Biophysics, Stockholm University, SE-106 91 Stockholm, Sweden.
authors.forename: Isolde
authors.initials: I
authors.lastname: Palombo
authors.forename: Daniel O
authors.initials: DO
authors.lastname: Daley
mesh_terms: D003573:Cytochrome b Group; D003580:Cytochromes / Q000737:chemistry* / Q000378:metabolism*; D004926:Escherichia coli / Q000378:metabolism*; D029968:Escherichia coli Proteins / Q000737:chemistry* / Q000378:metabolism*; D006418:Heme / Q000378:metabolism*; D008969:Molecular Sequence Data; D017433:Protein Structure, Secondary
chemical_list: D003573:Cytochrome b Group; D003580:Cytochromes; D029968:Escherichia coli Proteins; C083850:cytochrome bo3, E coli; D006418:Heme