3i7u

Crystal structure of AP4A hydrolase (aq_158) from Aquifex aeolicus VF5

spinqualitylabelsall models 3i7u, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3i7u is a 4 chain structure with sequence from Aquifex aeolicus VF5. This structure supersedes the now removed PDB entry 2pbt. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.8Å Ligands: CL, EDO, PEG, PG4, PGE, TRS Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function O66548_AQUAE 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 Asymmetric diadenosine tetraphosphate (Ap(4)A) hydrolases degrade the metabolite Ap(4)A back into ATP and AMP. The three-dimensional crystal structure of Ap(4)A hydrolase (16 kDa) from Aquifex aeolicus has been determined in free and ATP-bound forms at 1.8 and 1.95 A resolution, respectively. The overall three-dimensional crystal structure of the enzyme shows an alphabetaalpha-sandwich architecture with a characteristic loop adjacent to the catalytic site of the protein molecule. The ATP molecule is bound in the primary active site and the adenine moiety of the nucleotide binds in a ring-stacking arrangement equivalent to that observed in the X-ray structure of Ap(4)A hydrolase from Caenorhabditis elegans. Binding of ATP in the active site induces local conformational changes which may have important implications in the mechanism of substrate recognition in this class of enzymes. Furthermore, two invariant water molecules have been identified and their possible structural and/or functional roles are discussed. In addition, modelling of the substrate molecule at the primary active site of the enzyme suggests a possible path for entry and/or exit of the substrate and/or product molecule. Free and ATP-bound structures of Ap4A hydrolase from Aquifex aeolicus V5.,Jeyakanthan J, Kanaujia SP, Nishida Y, Nakagawa N, Praveen S, Shinkai A, Kuramitsu S, Yokoyama S, Sekar K Acta Crystallogr D Biol Crystallogr. 2010 Feb;66(Pt 2):116-24. Epub 2010, Jan 22. PMID:20124691 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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