3kta

Structural Basis for Adenylate Kinase Activity in ABC ATPases

spinqualitylabelsall models 3kta, resolution 1.63Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3kta is a 4 chain structure with sequence from Pyrococcus furiosus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.627Å Ligands: AP5, MG, MSE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function SMC_PYRFU Required for chromosome condensation and partitioning (By similarity). Binds single-stranded but not double-stranded DNA.[HAMAP-Rule:MF_01894] 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 ATP-binding cassette (ABC) enzymes are involved in diverse biological processes ranging from transmembrane transport to chromosome cohesion and DNA repair. They typically use ATP hydrolysis to conduct energy-dependent biological reactions. However, the cystic fibrosis transmembrane conductance regulator and the DNA repair protein Rad50 can also catalyze the adenylate kinase reaction (ATP+AMP<-->2ADP). To clarify and provide a mechanistic basis for the adenylate kinase activity of ABC enzymes, we report the crystal structure of the nucleotide-binding domain of the Pyrococcus furiosus structural maintenance of chromosome protein (pfSMC(nbd)) in complex with the adenylate kinase inhibitor P(1),P(5)-di(adenosine-5')pentaphosphate. We show that pfSMC(nbd) possesses reverse adenylate kinase activity. Our results suggest that in adenylate kinase reactions, ATP binds to its canonical binding site while AMP binds to the Q-loop glutamine and a hydration water of the Mg(2+) ion. Furthermore, mutational analysis indicates that adenylate kinase reaction occurs in the engaged pfSMC(nbd) dimer and requires the Signature motif for phosphate transfer. Our results explain how ATP hydrolysis and adenylate kinase reactions can be catalyzed by the same functional motifs within the structural framework of ABC enzymes. Thus, adenylate kinase activity is likely to be a latent activity in many ABC enzymes. Structural basis for adenylate kinase activity in ABC ATPases.,Lammens A, Hopfner KP J Mol Biol. 2010 Aug 13;401(2):265-73. Epub 2010 Jun 19. PMID:20600125 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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