title: Crystallisation and preliminary structure determination of a NADH: quinone oxidoreductase from the extremophile Acidianus ambivalens.
abstract: NADH:quinone oxidoreductases (NDHs), constitute one of the electron entry points into membrane-bound respiratory chains, oxidising NADH and reducing quinones. Type-II NDHs (NDH-2) are functionally unable to translocate protons and are typically constituted by a single approximately 50 kDa subunit lacking iron-sulfur clusters and containing one flavin as the sole redox centre. No three dimensional crystal structure is yet available for NDHs. We describe the crystallisation and preliminary structure determination of a NDH-2 that contains a covalently bound FAD, isolated from the membrane fraction of Acidianus ambivalens, a hyperthermoacidophilic archaeon capable of growing at 80 degrees C and pH 2.0. NDH-2 was solubilised with the detergent n-dodecyl-beta-d-maltoside and crystallised using ammonium phosphate as precipitant. The structure was solved by MIRAS using Pt and I derivatives.
authors.affiliation: Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Apartado 127, 2781-901 Oeiras, Portugal.
authors.forename: José A
authors.initials: JA
authors.lastname: Brito
authors.forename: Tiago M
authors.initials: TM
authors.lastname: Bandeiras
authors.forename: Miguel
authors.initials: M
authors.lastname: Teixeira
authors.forename: Clemens
authors.initials: C
authors.lastname: Vonrhein
authors.forename: Margarida
authors.initials: M
authors.lastname: Archer
mesh_terms: D041541:Acidianus / Q000201:enzymology*; D003460:Crystallization; D018360:Crystallography, X-Ray; D011808:Quinone Reductases / Q000737:chemistry*
chemical_list: C041831:NADH dehydrogenase (quinone); D011808:Quinone Reductases