The central stalk in ATP synthase, made of gamma, delta and epsilon subunits in the mitochondrial enzyme, is the key rotary element in the enzyme's catalytic mechanism. The gamma subunit penetrates the catalytic (alpha beta)(3) domain and protrudes beneath it, interacting with a ring of c subunits in the membrane that drives rotation of the stalk during ATP synthesis ...
The central stalk in ATP synthase, made of gamma, delta and epsilon subunits in the mitochondrial enzyme, is the key rotary element in the enzyme's catalytic mechanism. The gamma subunit penetrates the catalytic (alpha beta)(3) domain and protrudes beneath it, interacting with a ring of c subunits in the membrane that drives rotation of the stalk during ATP synthesis. In other crystals of F(1)-ATPase, the protrusion was disordered, but with crystals of F(1)-ATPase inhibited with dicyclohexylcarbodiimide, the complete structure was revealed. The delta and epsilon subunits interact with a Rossmann fold in the gamma subunit, forming a foot. In ATP synthase, this foot interacts with the c-ring and couples the transmembrane proton motive force to catalysis in the (alpha beta)(3) domain.
Related Citations:
Molecular Architecture of the Rotary Motor in ATP Synthase Stock, D., Leslie, A.G.W., Walker, J.E. (1999) Science 286: 1700
ATP Synthesis by Rotary Catalysis (Nobel Lecture) Walker, J.E. (1998) Angew Chem Int Ed Engl 37: 2308
Crystal Structure of the Epsilon Subunit of the Proton-Translocating ATP Synthase from Escherichia Coli Uhlin, U., Cox, G.B., Guss, J.M. (1997) Structure 9: 1219
Structure at 2.8 A Resolution of F1-ATPase from Bovine Heart Mitochondria Abrahams, J.P., Leslie, A.G.W., Lutter, R., Walker, J.E. (1994) Nature 370: 621
Crystallization of F1-ATPase from Bovine Heart Mitochondria Lutter, R., Abrahams, J.P., Van Raaij, M.J., Todd, R.J., Lundqvist, T., Buchanan, S.K., Leslie, A.G., Walker, J.E. (1993) J Mol Biol 229: 787
Inactivation of Bovine Mitochondrial F1-ATPase with Dicyclohexyl-Carbodiimide [14C] Leads to the Modification of a Specific Glutamic-Acid Residue in the Beta Subunit Esch, F.S., Bohlen, P., Otsuka, A.S., Yoshida, M., Allison, W.S. (1981) J Biol Chem 256: 9084
Organizational Affiliation:
The Medical Research Council Dunn Human Nutrition Unit, Hills Road, Cambridge CB2 2XY, UK.
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