Electron transfer in the respiratory chain at low salinity

Ana Paula Lobez, Fei Wu, Justin M. Di Trani, John L. Rubinstein, Mikael Oliveberg (), Peter Brzezinski () and Agnes Moe ()
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Ana Paula Lobez: Stockholm University
Fei Wu: Stockholm University
Justin M. Di Trani: Toronto
John L. Rubinstein: Toronto
Mikael Oliveberg: Stockholm University
Peter Brzezinski: Stockholm University
Agnes Moe: Stockholm University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Recent studies have established that cellular electrostatic interactions are more influential than assumed previously. Here, we use cryo-EM and perform steady-state kinetic studies to investigate electrostatic interactions between cytochrome (cyt.) c and the complex (C) III2-IV supercomplex from Saccharomyces cerevisiae at low salinity. The kinetic studies show a sharp transition with a Hill coefficient ≥2, which together with the cryo-EM data at 2.4 Å resolution indicate multiple cyt. c molecules bound along the supercomplex surface. Negatively charged loops of CIII2 subunits Qcr6 and Qcr9 become structured to interact with cyt. c. In addition, the higher resolution allows us to identify water molecules in proton pathways of CIV and, to the best of our knowledge, previously unresolved cardiolipin molecules. In conclusion, the lowered electrostatic screening renders engagement of multiple cyt. c molecules that are directed by electrostatically structured CIII2 loops to conduct electron transfer between CIII2 and CIV.

Date: 2024
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DOI: 10.1038/s41467-024-52475-3

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