Download MendeleyStructure and conformational states of the bovine mitochondrial ATP synthase by cryo-EM.
Zhou, A., Rohou, A., Schep, D.G., Bason, J.V., Montgomery, M.G., Walker, J.E., Grigorieff, N., Rubinstein, J.L.(2015) Elife 4: e10180-e10180
- PubMed: 26439008
- DOI: https://doi.org/10.7554/eLife.10180
- Primary Citation of Related Structures:
5ARA, 5ARE, 5ARH, 5ARI, 5FIJ, 5FIK, 5FIL - PubMed Abstract:
Adenosine triphosphate (ATP), the chemical energy currency of biology, is synthesized in eukaryotic cells primarily by the mitochondrial ATP synthase. ATP synthases operate by a rotary catalytic mechanism where proton translocation through the membrane-inserted FO region is coupled to ATP synthesis in the catalytic F1 region via rotation of a central rotor subcomplex. We report here single particle electron cryomicroscopy (cryo-EM) analysis of the bovine mitochondrial ATP synthase. Combining cryo-EM data with bioinformatic analysis allowed us to determine the fold of the a subunit, suggesting a proton translocation path through the FO region that involves both the a and b subunits. 3D classification of images revealed seven distinct states of the enzyme that show different modes of bending and twisting in the intact ATP synthase. Rotational fluctuations of the c8-ring within the FO region support a Brownian ratchet mechanism for proton-translocation-driven rotation in ATP synthases.
Organizational Affiliation:
The Hospital for Sick Children Research Institute, Toronto, Canada.
