3fks
From Proteopedia
Yeast F1 ATPase in the absence of bound nucleotides
Structural highlights
FunctionATPA_YEAST Mitochondrial membrane ATP synthase (F(1)F(0) ATP synthase or Complex V) produces ATP from ADP in the presence of a proton gradient across the membrane which is generated by electron transport complexes of the respiratory chain. F-type ATPases consist of two structural domains, F(1) - containing the extramembraneous catalytic core, and F(0) - containing the membrane proton channel, linked together by a central stalk and a peripheral stalk. During catalysis, ATP synthesis in the catalytic domain of F(1) is coupled via a rotary mechanism of the central stalk subunits to proton translocation. Subunits alpha and beta form the catalytic core in F(1). Rotation of the central stalk against the surrounding alpha(3)beta(3) subunits leads to hydrolysis of ATP in three separate catalytic sites on the beta subunits. Subunit alpha does not bear the catalytic high-affinity ATP-binding sites (By similarity). 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 PubMedThe crystal structure of nucleotide-free yeast F(1) ATPase has been determined at a resolution of 3.6 A. The overall structure is very similar to that of the ground state enzyme. In particular, the beta(DP) and beta(TP) subunits both adopt the closed conformation found in the ground state structure despite the absence of bound nucleotides. This implies that interactions between the gamma and beta subunits are as important as nucleotide occupancy in determining the conformational state of the beta subunits. Furthermore, this result suggests that for the mitochondrial enzyme, there is no state of nucleotide occupancy that would result in more than one of the beta subunits adopting the open conformation. The adenine-binding pocket of the beta(TP) subunit is disrupted in the apoenzyme, suggesting that the beta(DP) subunit is responsible for unisite catalytic activity. Asymmetric structure of the yeast F1 ATPase in the absence of bound nucleotides.,Kabaleeswaran V, Shen H, Symersky J, Walker JE, Leslie AG, Mueller DM J Biol Chem. 2009 Apr 17;284(16):10546-51. Epub 2009 Feb 20. PMID:19233840[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
| ||||||||||||||||||||
