Mechanically driven ATP synthesis by F1-ATPase

Hiroyasu Itoh (), Akira Takahashi, Kengo Adachi, Hiroyuki Noji, Ryohei Yasuda, Masasuke Yoshida and Kazuhiko Kinosita
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Hiroyasu Itoh: Hamamatsu Photonics KK
Akira Takahashi: Hamamatsu Photonics KK
Kengo Adachi: Center for Integrative Bioscience, Okazaki National Research Institutes
Hiroyuki Noji: Institute of Industrial Science, University of Tokyo
Ryohei Yasuda: Cold Spring Harbor Laboratory
Masasuke Yoshida: ERATO “ATP System”
Kazuhiko Kinosita: Center for Integrative Bioscience, Okazaki National Research Institutes

Nature, 2004, vol. 427, issue 6973, 465-468

Abstract: Abstract ATP, the main biological energy currency, is synthesized from ADP and inorganic phosphate by ATP synthase in an energy-requiring reaction1,2,3. The F1 portion of ATP synthase, also known as F1-ATPase, functions as a rotary molecular motor: in vitro its γ-subunit rotates4 against the surrounding α3β3 subunits5, hydrolysing ATP in three separate catalytic sites on the β-subunits. It is widely believed that reverse rotation of the γ-subunit, driven by proton flow through the associated Fo portion of ATP synthase, leads to ATP synthesis in biological systems1,2,3,6,7. Here we present direct evidence for the chemical synthesis of ATP driven by mechanical energy. We attached a magnetic bead to the γ-subunit of isolated F1 on a glass surface, and rotated the bead using electrical magnets. Rotation in the appropriate direction resulted in the appearance of ATP in the medium as detected by the luciferase–luciferin reaction. This shows that a vectorial force (torque) working at one particular point on a protein machine can influence a chemical reaction occurring in physically remote catalytic sites, driving the reaction far from equilibrium.

Date: 2004
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DOI: 10.1038/nature02212

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