Analyzing conformational changes in single FRET-labeled A1 parts of archaeal A1AO-ATP synthase

Hendrik Sielaff; Dhirendra Singh; Gerhard Grüber; Michael Börsch

doi:10.1117/12.2286785

20 February 2018 Analyzing conformational changes in single FRET-labeled A₁ parts of archaeal A₁A_O-ATP synthase

Hendrik Sielaff, Dhirendra Singh, Gerhard Grüber, Michael Börsch

Proceedings Volume 10500, Single Molecule Spectroscopy and Superresolution Imaging XI; 1050007 (2018) https://doi.org/10.1117/12.2286785
Event: SPIE BiOS, 2018, San Francisco, California, United States

Abstract

ATP synthases utilize a proton motive force to synthesize ATP. In reverse, these membrane-embedded enzymes can also hydrolyze ATP to pump protons over the membrane. To prevent wasteful ATP hydrolysis, distinct control mechanisms exist for ATP synthases in bacteria, archaea, chloroplasts and mitochondria. Single-molecule Förster resonance energy transfer (smFRET) demonstrated that the C-terminus of the rotary subunit ε in the Escherichia coli enzyme changes its conformation to block ATP hydrolysis. Previously, we investigate the related conformational changes of subunit F of the A₁A_O-ATP synthase from the archaeon Methanosarcina mazei Gö1. Here, we analyzed the lifetimes of fluorescence donor and acceptor dyes to distinguish between smFRET signals of conformational changes and potential artefacts.

Citation Download Citation

Hendrik Sielaff, Dhirendra Singh, Gerhard Grüber, and Michael Börsch "Analyzing conformational changes in single FRET-labeled A₁ parts of archaeal A₁A_O-ATP synthase", Proc. SPIE 10500, Single Molecule Spectroscopy and Superresolution Imaging XI, 1050007 (20 February 2018); https://doi.org/10.1117/12.2286785

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