title: Structures of the nucleotide-binding domain of the human ABCB6 transporter and its complexes with nucleotides.
abstract: The human ATP-binding cassette (ABC) transporter ABCB6 is involved in haem-precursor transport across the mitochondrial membrane. The crystal structure of its nucleotide-binding domain (NBD) has been determined in the apo form and in complexes with ADP, with ADP and Mg(2+) and with ATP at high resolution. The overall structure is L-shaped and consists of two lobes, consistent with other reported NBD structures. Nucleotide binding is mediated by the highly conserved Tyr599 and the Walker A motif, and induces notable structural changes. Structural comparison with other structurally characterized NBDs and full-length ABC transporters gives the first insight into the possible catalytic mechanism of ABCB6 and the role of the N-terminal helix alpha(1) in full-length ABCB6.
authors.affiliation: Helmholtz Zentrum für Infektionsforschung, Braunschweig, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Haffke
authors.forename: Anja
authors.initials: A
authors.lastname: Menzel
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Carius
authors.forename: Dieter
authors.initials: D
authors.lastname: Jahn
authors.forename: Dirk W
authors.initials: DW
authors.lastname: Heinz
mesh_terms: D018528:ATP-Binding Cassette Transporters / Q000737:chemistry*; D000595:Amino Acid Sequence; D000818:Animals; D018360:Crystallography, X-Ray; D006801:Humans; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009711:Nucleotides / Q000737:chemistry*; D054730:Protein Interaction Domains and Motifs; D017434:Protein Structure, Tertiary; D016415:Sequence Alignment; D040681:Structural Homology, Protein
chemical_list: C107991:ABCB6 protein, human; D018528:ATP-Binding Cassette Transporters; D009711:Nucleotides