3gqb

Publication Abstract from PubMed

Vacuolar-type ATPases (V-ATPases) exist in various cellular membranes of many organisms to regulate physiological processes by controlling the acidic environment. Here, we have determined the crystal structure of the A(3)B(3) subcomplex of V-ATPase at 2.8 A resolution. The overall construction of the A(3)B(3) subcomplex is significantly different from that of the alpha(3)beta(3) sub-domain in F(o)F(1)-ATP synthase, because of the presence of a protruding 'bulge' domain feature in the catalytic A subunits. The A(3)B(3) subcomplex structure provides the first molecular insight at the catalytic and non-catalytic interfaces, which was not possible in the structures of the separate subunits alone. Specifically, in the non-catalytic interface, the B subunit seems to be incapable of binding ATP, which is a marked difference from the situation indicated by the structure of the F(o)F(1)-ATP synthase. In the catalytic interface, our mutational analysis, on the basis of the A(3)B(3) structure, has highlighted the presence of a cluster composed of key hydrophobic residues, which are essential for ATP hydrolysis by V-ATPases.

Crystal structure of A3B3 complex of V-ATPase from Thermus thermophilus.,Maher MJ, Akimoto S, Iwata M, Nagata K, Hori Y, Yoshida M, Yokoyama S, Iwata S, Yokoyama K EMBO J. 2009 Dec 2;28(23):3771-9. Epub 2009 Nov 5. PMID:19893485^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.