1nbm: Difference between revisions

==Overview==

BACKGROUND: F1-ATPase is the globular domain of F1F0-ATP synthase that, catalyses the hydrolysis of ATP to ADP and phosphate. The crystal, structure of bovine F1-ATPase has been determined previously to 2.8 A, resolution. The enzyme comprises five different subunits in the, stoichiometry alpha 3 beta 3 gamma delta epsilon; the three catalytic beta, subunits alternate with the three alpha subunits around the centrally, located single gamma subunit. To understand more about the catalytic, mechanisms, F1-ATPase was inhibited by reaction with, 4-chloro-7-nitrobenzofurazan (NBD-Cl) and the structure of the inhibited, complex (F1-NBD) determined by X-ray crystallography. RESULTS: In the, structure the three beta subunits adopt a different conformation with, different nucleotide occupancy. NBD-Cl reacts with the phenolic oxygen of, Tyr311 of the beta E subunit, which contains no bound nucleotide. The two, other catalytic subunits beta TP and beta DP contain bound, adenylyl-imidodiphosphate (AMP-PNP) and ADP, respectively. The binding, site of the NBD moiety does not overlap with the regions of beta E that, form the nucleotide-binding pocket in subunits beta TP and beta DP nor, does it occlude the nucleotide-binding site. Catalysis appears to be, inhibited because neither beta TP nor beta DP can accommodate a Tyr311, residue bearing an NBD group. CONCLUSIONS: The results presented here are, consistent with a rotary catalytic mechanism of ATP synthesis and, hydrolysis, which requires the sequential and concerted participation of, all three catalytic sites. NBD-Cl inhibits the enzyme by preventing the, modified subunit from adopting a conformation that is essential for, catalysis to proceed.

==About this Structure==

1NBM is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] with MG, PO4, ATP and ADP as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Transferred_entry:_3.6.3.14 Transferred entry: 3.6.3.14], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.6.1.34 3.6.1.34] Known structural/functional Sites: <scene name='pdbsite=CA1:The Carboxylate Group Of GLU Residue Is Believed To Acti ...'>CA1</scene>, <scene name='pdbsite=CA2:The Carboxylate Group Of GLU Residue Is Believed To Acti ...'>CA2</scene>, <scene name='pdbsite=CA3:The Carboxylate Group Of GLU Residue Is Believed To Acti ...'>CA3</scene>, <scene name='pdbsite=PL1:The Residue Listed Is The LYS Within The P-Loop (Phospha ...'>PL1</scene>, <scene name='pdbsite=PL2:The Residue Listed Is The LYS Within The P-Loop (Phospha ...'>PL2</scene>, <scene name='pdbsite=PL3:The Residue Listed Is The LYS Within The P-Loop (Phospha ...'>PL3</scene>, <scene name='pdbsite=PL4:The Residue Listed Is The LYS Within The P-Loop (Phospha ...'>PL4</scene>, <scene name='pdbsite=PL5:The Residue Listed Is The LYS Within The P-Loop (Phospha ...'>PL5</scene>, <scene name='pdbsite=PL6:The Residue Listed Is The LYS Within The P-Loop (Phospha ...'>PL6</scene> and <scene name='pdbsite=PL7:The Residue Listed Is The LYS Within The P-Loop (Phospha ...'>PL7</scene>. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1NBM OCA].

 

[[Category: Protein complex]]

[[Category: Transferred entry: 3.6.3.14]]

[[Category: Braig, K.]]

[[Category: Leslie, A.G.W.]]

[[Category: Orriss, G.L.]]

[[Category: Walker, J.E.]]

[[Category: f1-atpase]]