Cryo-EM structures of the TTYH family reveal a novel architecture for lipid interactions

Anastasiia Sukalskaia, Monique S. Straub, Dawid Deneka, Marta Sawicka () and Raimund Dutzler ()
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Anastasiia Sukalskaia: University of Zurich
Monique S. Straub: University of Zurich
Dawid Deneka: University of Zurich
Marta Sawicka: University of Zurich
Raimund Dutzler: University of Zurich

Nature Communications, 2021, vol. 12, issue 1, 1-12

Abstract: Abstract The Tweety homologs (TTYHs) are members of a conserved family of eukaryotic membrane proteins that are abundant in the brain. The three human paralogs were assigned to function as anion channels that are either activated by Ca2+ or cell swelling. To uncover their unknown architecture and its relationship to function, we have determined the structures of human TTYH1–3 by cryo-electron microscopy. All structures display equivalent features of a dimeric membrane protein that contains five transmembrane segments and an extended extracellular domain. As none of the proteins shows attributes reminiscent of an anion channel, we revisited functional experiments and did not find any indication of ion conduction. Instead, we find density in an extended hydrophobic pocket contained in the extracellular domain that emerges from the lipid bilayer, which suggests a role of TTYH proteins in the interaction with lipid-like compounds residing in the membrane.

Date: 2021
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DOI: 10.1038/s41467-021-25106-4

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