2v7q

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spinqualitylabelsall models 2v7q, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

THE STRUCTURE OF F1-ATPASE INHIBITED BY I1-60HIS, A MONOMERIC FORM OF THE INHIBITOR PROTEIN, IF1.

Overview

The structure of bovine F(1)-ATPase inhibited by a monomeric form of the, inhibitor protein, IF(1), known as I1-60His, lacking most of the, dimerization region, has been determined at 2.1-A resolution. The resolved, region of the inhibitor from residues 8-50 consists of an extended, structure from residues 8-13, followed by two alpha-helices from residues, 14-18 and residues 21-50 linked by a turn. The binding site in the, beta(DP)-alpha(DP) catalytic interface is complex with contributions from, five different subunits of F(1)-ATPase. The longer helix extends from the, external surface of F(1) via a deep groove made from helices and loops in, the C-terminal domains of subunits beta(DP), alpha(DP), beta(TP), and, alpha(TP) to the internal cavity surrounding the central stalk. The linker, and shorter helix interact with the gamma-subunit in the central stalk, and the N-terminal region extends across the central cavity to interact, with the nucleotide binding domain of the alpha(E) subunit. To form these, complex interactions and penetrate into the core of the enzyme, it is, likely that the initial interaction of the inhibitor with F(1) forms via, the open conformation of the beta(E) subunit. Then, as two ATP molecules, are hydrolyzed, the beta(E)-alpha(E) interface converts to the, beta(DP)-alpha(DP) interface via the beta(TP)-alpha(TP) interface, trapping the inhibitor progressively in its binding site and a nucleotide, in the catalytic site of subunit beta(DP). The inhibition probably arises, by IF(1) imposing the structure and properties of the beta(TP)-alpha(TP), interface on the beta(DP)-alpha(DP) interface, thereby preventing it from, hydrolyzing the bound ATP.

About this Structure

2V7Q is a Protein complex structure of sequences from Bos taurus with , , and as ligands. Active as Adenosine-tetraphosphatase, with EC number 3.6.1.14 Known structural/functional Site: . Full crystallographic information is available from OCA.

Reference

How the regulatory protein, IF1, inhibits F1-ATPase from bovine mitochondria., Gledhill JR, Montgomery MG, Leslie AG, Walker JE, Proc Natl Acad Sci U S A. 2007 Oct 2;104(40):15671-6. Epub 2007 Sep 25. PMID:17895376

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