3ssa | pdb_00003ssa

Crystal structure of subunit B mutant N157T of the A1AO ATP synthase

spinqualitylabelsall models 3ssa, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3ssa is a 2 chain structure with sequence from Methanosarcina mazei. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 1PE, AES, CL, GOL, PEG, PGE Related: 3b2q, 3dsr, 3eiu, 2c61 Gene: ahaB, atpB, MM_0779 (Methanosarcina mazei) Activity: H(+)-transporting two-sector ATPase, with EC number 3.6.3.14 Resources: FirstGlance, OCA, RCSB, PDBsum Function [VATB_METMA] Produces ATP from ADP in the presence of a proton gradient across the membrane. The archaeal beta chain is a regulatory subunit. Publication Abstract from PubMed A strategically placed tryptophan in position of Arg416 was used as an optical probe to monitor adenosine triphosphate and adenosine-diphosphate binding to subunit B of the A(1)A(O) adenosine triphosphate (ATP) synthase from Methanosarcina mazei Go1. Tryptophan fluorescence and fluorescence correlation spectroscopy gave binding constants indicating a preferred binding of ATP over ADP to the protein. The X-ray crystal structure of the R416W mutant protein in the presence of ATP was solved to 2.1 A resolution, showing the substituted Trp-residue inside the predicted adenine-binding pocket. The cocrystallized ATP molecule could be trapped in a so-called transition nucleotide-binding state. The high resolution structure shows the phosphate residues of the ATP near the P-loop region (S150-E158) and its adenine ring forms pi-pi interaction with Phe149. This transition binding position of ATP could be confirmed by tryptophan emission spectra using the subunit B mutant F149W. The trapped ATP position, similar to the one of the binding region of the antibiotic efrapeptin in F(1)F(O) ATP synthases, is discussed in light of a transition nucleotide-binding state of ATP while on its way to the final binding pocket. Finally, the inhibitory effect of efrapeptin C in ATPase activity of a reconstituted A(3)B(3)- and A(3)B(R416W)(3)-subcomplex, composed of subunit A and the B subunit mutant R416W, of the A(1)A(O) ATP synthase is shown. Spectroscopic and crystallographic studies of the mutant R416W give insight into the nucleotide binding traits of subunit B of the A1Ao ATP synthase.,Kumar A, Manimekalai MS, Balakrishna AM, Hunke C, Weigelt S, Sewald N, Gruber G Proteins. 2009 Jun;75(4):807-19. PMID:19003877 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also ATPase

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