Functional anatomy of an allosteric protein

Prasad Purohit, Shaweta Gupta, Snehal Jadey and Anthony Auerbach ()
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Prasad Purohit: State University of New York at Buffalo
Shaweta Gupta: State University of New York at Buffalo
Snehal Jadey: State University of New York at Buffalo
Anthony Auerbach: State University of New York at Buffalo

Nature Communications, 2013, vol. 4, issue 1, 1-12

Abstract: Abstract Synaptic receptors are allosteric proteins that switch on and off to regulate cell signalling. Here, we use single-channel electrophysiology to measure and map energy changes in the gating conformational change of a nicotinic acetylcholine receptor. Two separated regions in the α-subunits—the transmitter-binding sites and αM2–αM3 linkers in the membrane domain—have the highest ϕ-values (change conformation the earliest), followed by the extracellular domain, most of the membrane domain and the gate. Large gating-energy changes occur at the transmitter-binding sites, α-subunit interfaces, the αM1 helix and the gate. We hypothesize that rearrangements of the linkers trigger the global allosteric transition, and that the hydrophobic gate unlocks in three steps. The mostly local character of side-chain energy changes and the similarly high ϕ-values of separated domains, both with and without ligands, suggest that gating is not strictly a mechanical process initiated by the affinity change for the agonist.

Date: 2013
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3984

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DOI: 10.1038/ncomms3984

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