2b8p | pdb_00002b8p

Crystal structure of Acanthamoeba polyphaga mimivirus NDK, the first viral nucleoside diphosphate kinase

spinqualitylabelsall models 2b8p, resolution 2.55Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2b8p is a 2 chain structure with sequence from Mimivirus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 Related: 2b8q Gene: NDK (Mimivirus) Activity: Nucleoside-diphosphate kinase, with EC number 2.7.4.6 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Function [NDK_MIMIV] Plays a role in the synthesis of nucleoside triphosphates. This activity may optimize the replication of the AT-rich (73%) viral genome in a thymidine-limited host environment. 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 analysis of the Acanthamoeba polyphaga mimivirus genome revealed the first virus-encoded nucleoside diphosphate kinase (NDK), an enzyme that is central to the synthesis of RNA and DNA, ubiquitous in cellular organisms, and well conserved among the three domains of life. In contrast with the broad specificity of cellular NDKs for all types of ribo- and deoxyribonucleotides, the mimivirus enzyme exhibits a strongly preferential affinity for deoxypyrimidines. In order to elucidate the molecular basis of this unique substrate specificity, we determined the three-dimensional (3D) structure of the Acanthamoeba polyphaga mimivirus NDK alone and in complex with various nucleotides. As predicted from a sequence comparison with cellular NDKs, the 3D structure of the mimivirus enzyme exhibits a shorter Kpn loop, previously recognized as a main feature of the NDK active site. The structure of the viral enzyme in complex with various nucleotides also pinpointed two residue changes, both located near the active site and specific to the viral NDK, which could explain its stronger affinity for deoxynucleotides and pyrimidine nucleotides. The role of these residues was explored by building a set of viral NDK variants, assaying their enzymatic activities, and determining their 3D structures in complex with various nucleotides. A total of 26 crystallographic structures were determined at resolutions ranging from 2.8 A to 1.5 A. Our results suggest that the mimivirus enzyme progressively evolved from an ancestral NDK under the constraints of optimizing its efficiency for the replication of an AT-rich (73%) viral genome in a thymidine-limited host environment. Dissecting the unique nucleotide specificity of mimivirus nucleoside diphosphate kinase.,Jeudy S, Lartigue A, Claverie JM, Abergel C J Virol. 2009 Jul;83(14):7142-50. Epub 2009 May 13. PMID:19439473 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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