1w7w

Structure and mutational analysis of a plant mitochondrial nucleoside diphosphate kinase: identification of residues involved in serine phosphorylation and oligomerization.

spinqualitylabelsall models 1w7w, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1w7w is a 6 chain structure with sequence from Pisum sativum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.8Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q9SP13_PEA 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 We report the first crystal structure of a plant (Pisum sativum L. cv Oregon sugarpod) mitochondrial nucleoside diphosphate kinase. Similar to other eukaryotic nucleoside diphosphate kinases, the plant enzyme is a hexamer; the six monomers in the asymmetric unit are arranged as trimers of dimers. Different functions of the kinase have been correlated with the oligomeric structure and the phosphorylation of Ser residues. We show that the occurrence of Ser autophosphorylation depends on enzymatic activity. The mutation of the strictly conserved Ser-119 to Ala reduced the Ser phosphorylation to about one-half of that observed in wild type with only a modest change of enzyme activity. We also show that mutating another strictly conserved Ser, Ser-69, to Ala reduces the enzyme activity to 6% and 14% of wild-type using dCDP and dTDP as acceptors, respectively. Changes in the oligomerization pattern of the S69A mutant were observed by cross-linking experiments. A reduction in trimer formation and a change in the dimer interaction could be detected with a concomitant increase of tetramers. We conclude that the S69 mutant is involved in the stabilization of the oligomeric state of this plant nucleoside diphosphate kinase. Structure and mutational analysis of a plant mitochondrial nucleoside diphosphate kinase. Identification of residues involved in serine phosphorylation and oligomerization.,Johansson M, Mackenzie-Hose A, Andersson I, Knorpp C Plant Physiol. 2004 Oct;136(2):3034-42. Epub 2004 Oct 1. PMID:15466238 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Nucleoside diphosphate kinase 3D structures

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