2x0i

2.9 A RESOLUTION STRUCTURE OF MALATE DEHYDROGENASE FROM ARCHAEOGLOBUS FULGIDUS IN COMPLEX WITH NADH

spinqualitylabelsall models 2x0i, resolution 2.91Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2x0i is a 1 chain structure with sequence from Archaeoglobus fulgidus DSM 4304. This structure supersedes the now removed PDB entry 1ojs. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.91Å Ligands: NA, NAI, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function MDH_ARCFU Catalyzes the reversible oxidation of malate to oxaloacetate.[HAMAP-Rule:MF_00487] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The crystal structure of malate dehydrogenase from the hyperthermophilic archaeon Archeoglobus fulgidus, in complex with its cofactor NAD, was solved at 2.9A resolution. The crystal structure shows a compact homodimer with one coenzyme bound per subunit. The substrate binding site is occupied by a sulphate ion. In order to gain insight into adaptation mechanisms, which allow the protein to be stable and active at high temperatures, the 3D structure was compared to those of several thermostable and hyperthermostable homologues, and to halophilic malate dehydrogenase. The hyperthermostable A. fulgidus MalDH protein displays a reduction of the solvent-exposed surface, an optimised compact hydrophobic core, a high number of hydrogen bonds, and includes a large number of ion pairs at the protein surface. These features occur concomitantly with a reduced number of residues in the protein subunit, due to several deletions in loop regions. The loops are further stiffened by ion pair links with secondary structure elements. A. fulgidus malate dehydrogenase is the only dimeric protein known to date that belongs to the [LDH-like] MalDH family. All the other known members of this family are homo-tetramers. The crystal structures revealed that the association of the dimers to form tetramers is prevented by several deletions, taking place at the level of two loops that are known to be essential for the tetramerisation process within the LDH and [LDH-like] MalDH enzymes. The 2.9A resolution crystal structure of malate dehydrogenase from Archaeoglobus fulgidus: mechanisms of oligomerisation and thermal stabilisation.,Irimia A, Vellieux FM, Madern D, Zaccai G, Karshikoff A, Tibbelin G, Ladenstein R, Lien T, Birkeland NK J Mol Biol. 2004 Jan 2;335(1):343-56. PMID:14659762 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Malate dehydrogenase

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