3m4y

Structural characterization of the subunit A mutant P235A of the A-ATP synthase

spinqualitylabelsall models 3m4y, resolution 2.38Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3m4y is a 1 chain structure with sequence from Pyrococcus horikoshii OT3. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.38Å Ligands: ACY, MPD, TRS Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function VATA_PYRHO Produces ATP from ADP in the presence of a proton gradient across the membrane. The archaeal alpha chain is a catalytic subunit. Publication Abstract from PubMed The mutants P235A and F236A have been generated and their crystal structure was determined to resolutions of 2.38 and 2.35 A, respectively, in order to understand the residues involved in the formation of the novel arched P-loop of subunit A of the A-ATP synthase from Pyrococcus horikoshii OT3. Both the structures show unique, altered conformations for the P-loop. Comparison with the previously solved wild type and P-loop mutant S238A structures of subunit A showed that the P-loop conformation for these two novel mutants occupy intermediate positions, with the wild type fully arched and the well-relaxed S238A mutant structures taking the extreme positions. Even though the deviation is similar for both mutants, the curvature of the P-loop faces the opposite direction. Deviations in the GER-loop, lying above the P-loop, are similar for both mutants, but in F236A, it moves towards the P-loop by around 2 A. The curvature of the loop region V392-V410, located directly behind the P-loop, moves close by 3.6 A towards the P-loop in the F236A structure and away by 2.5 A in the P235A structure. Two major deviations were observed in the P235A mutant, which are not identified in any of the subunit A structures analyzed so far, one being a wide movement of the N-terminal loop region (R90-P110) making a rotation of 80 degrees and the other being rigid-body rotation of the C-terminal helices from Q520-A588 by around 4 degrees upwards. Taken together, the data presented demonstrate the concerted effects of the critical residues P235A, F236, and S238 in the unique P-loop conformation of the A-ATP synthases. The critical roles of residues P235 and F236 of subunit A of the motor protein A-ATP synthase in P-loop formation and nucleotide binding.,Kumar A, Manimekalai MS, Balakrishna AM, Priya R, Biukovic G, Jeyakanthan J, Gruber G J Mol Biol. 2010 Sep 3;401(5):892-905. Epub 2010 Jul 6. PMID:20615420 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also ATPase 3D structures

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