1ghj
From Proteopedia
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SOLUTION STRUCTURE OF THE LIPOYL DOMAIN OF THE 2-OXOGLUTARATE DEHYDROGENASE COMPLEX FROM AZOTOBACTER VINELAND II, NMR, MINIMIZED AVERAGE STRUCTURE
Overview
The three-dimensional solution structure of the lipoyl domain of the, 2-oxoglutarate dehydrogenase complex from Azotobacter vinelandii has been, determined from nuclear magnetic resonance data by using distance geometry, and dynamical simulated annealing refinement. The structure determination, is based on a total of 580 experimentally derived distance constraints and, 65 dihedral angle constraints. The solution structure is represented by an, ensemble of 25 structures with an average root-mean-square deviation, between the individual structures of the ensemble and the mean coordinates, of 0.71 A for backbone atoms and 1.08 A for all heavy atoms. The overall, fold of the lipoyl domain is that of a beta-barrel-sandwich hybrid. It, consists of two almost parallel four-stranded anti-parallel beta-sheets, formed around a well-defined hydrophobic core, with a central position of, the single tryptophan 21. The lipoylation site, lysine 42, is found in a, beta-turn at the far end of one of the sheets, and is close in space to a, solvent-exposed loop comprising residues 7 to 15. The lipoyl domain, displays a remarkable internal symmetry that projects one beta-sheet onto, the other beta-sheet after rotation of approximately 180 degrees about a, 2-fold rotational symmetry axis. There is close structural similarity, between the structure of this 2-oxoglutarate dehydrogenase complex lipoyl, domain and the structures of the lipoyl domains of pyruvate dehydrogenase, complexes from Bacillus stearothermophilus and Escherichia coli, and, conformational differences occur primarily in a solvent-exposed loop close, in space to the lipoylation site. The lipoyl domain structure is discussed, in relation to the process of molecular recognition of lipoyl domains by, their parent 2-oxo acid dehydrogenase.
About this Structure
1GHJ is a Single protein structure of sequence from Azotobacter vinelandii. Active as Dihydrolipoyllysine-residue succinyltransferase, with EC number 2.3.1.61 Full crystallographic information is available from OCA.
Reference
Solution structure of the lipoyl domain of the 2-oxoglutarate dehydrogenase complex from Azotobacter vinelandii., Berg A, Vervoort J, de Kok A, J Mol Biol. 1996 Aug 23;261(3):432-42. PMID:8780784
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