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Updated: Jul 5, 2026
10:39
Visualization of ATP Synthase Dimers in Mitochondria by Electron Cryo-tomography
Published on: September 14, 2014
A planar dimer of bovine ATP synthase
Chimari Jiko1, Atsuki Nakano2, Yosuke Teshirogi3
1Frontier Research Project on Integrated Radiation and Nuclear Science, Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka, Japan.
Cell Death and Differentiation
|July 3, 2026
Summary
Researchers discovered a new planar dimeric form of bovine ATP synthase (adenosine triphosphate synthase). This structure, unlike typical V-shaped dimers, has minimal membrane bending and suggests specialized functions within mitochondria.
Area of Science:
- Biochemistry
- Structural Biology
- Mitochondrial Biology
Background:
- Mammalian mitochondrial ATP synthase forms V-shaped dimers crucial for mitochondrial cristae.
- These dimers induce significant membrane curvature during ATP synthesis.
Purpose of the Study:
- To identify and characterize alternative structural forms of mammalian mitochondrial ATP synthase.
- To investigate the structural basis for potential functional specialization within ATP synthase populations.
Main Methods:
- Gentle, column-free purification techniques.
- Single-particle cryo-electron microscopy (cryo-EM).
- Molecular dynamics (MD) simulations.
Main Results:
- A novel planar dimeric form of bovine ATP synthase was identified, showing minimal membrane bending.
- This planar dimer features an anti-parallel arrangement of ATP synthase complexes linked by a straight conformation of inhibitory factor 1 (IF1).
- Molecular dynamics simulations indicated facile transitions between straight and kinked IF1 conformations.
Conclusions:
- The planar ATP synthase dimer exhibits distinct structural features, including peripheral stalk positioning.
- These structural differences suggest specialized functions and localization for planar dimers.
- The findings support a model of functional division of labor among mitochondrial ATP synthase populations.
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