Abstract
Co-reconstitution of subunits E and G of the yeast V-ATPase and the alpha and beta subunits of the F(1)-ATPase from the thermophilic Bacillus PS3 (TF(1)) resulted in an alpha(3)beta(3)EG hybrid complex showing 53% of the ATPase activity of TF(1). The alpha(3)beta(3)EG oligomer was characterized by electron microscopy. By processing 40,000 single particle projections, averaged two-dimensional projections at 1.2-2.4-nm resolution were obtained showing the hybrid complex in various positions. Difference mapping of top and side views of this complex with projections of the atomic model of the alpha(3)beta(3) subcomplex from TF(1) (Shirakihara, Y., Leslie, A. G., Abrahams, J. P., Walker, J. E., Ueda, T., Sekimoto, Y., Kambara, M., Saika, K., Kagawa, Y., and Yoshida, M. (1997) Structure 5, 825-836) demonstrates that a seventh mass is located inside the shaft of the alpha(3)beta(3) barrel and extends out from the hexamer. Furthermore, difference mapping of the alpha(3)beta(3)EG oligomer with projections of the A(3)B(3)E and A(3)B(3)EC subcomplexes of the V(1) from Caloramator fervidus (Chaban, Y., Ubbink-Kok, T., Keegstra, W., Lolkema, J. S., and Boekema, E. J. (2002) EMBO Rep. 3, 982-987) shows that the mass inside the shaft is made ...Continue Reading
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