1llq

Crystal Structure of Malic Enzyme from Ascaris suum Complexed with Nicotinamide Adenine Dinucleotide

spinqualitylabelsall models 1llq, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1llq is a 2 chain structure with sequence from Ascaris suum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: NAD Activity: Malate dehydrogenase (oxaloacetate-decarboxylating), with EC number 1.1.1.38 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum 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 structure of the Ascaris suum mitochondrial NAD-malic enzyme in binary complex with NAD has been solved to a resolution of 2.3 A by X-ray crystallography. The structure resembles that of the human mitochondrial enzyme determined in complex with NAD [Xu, Y., Bhargava, G., Wu, H., Loeber, G., and Tong, L. (1999) Structure 7, 877-889]. The enzyme is a tetramer comprised of subunits possessing four domains organized in an "open" structure typical of the NAD-bound form. The subunit organization, as in the human enzyme, is a dimer of dimers. The Ascaris enzyme contains 30 additional residues at its amino terminus relative to the human enzyme. These residues significantly increase the interactions that promote tetramer formation and give rise to different subunit-subunit interactions. Unlike the mammalian enzyme, the Ascaris malic enzyme is not regulated by ATP, and no ATP binding site is observed in this structure. Although the active sites of the two enzymes are similar, residues interacting with NAD differ between the two. The structure is discussed in terms of the mechanism and particularly with respect to previously obtained kinetic and site-directed mutagenesis experiments. Crystal structure of the malic enzyme from Ascaris suum complexed with nicotinamide adenine dinucleotide at 2.3 A resolution.,Coleman DE, Rao GS, Goldsmith EJ, Cook PF, Harris BG Biochemistry. 2002 Jun 4;41(22):6928-38. PMID:12033925 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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