The cryo-EM structure of the SNX–BAR Mvp1 tetramer

Dapeng Sun, Natalia V. Varlakhanova, Bryan A. Tornabene, Rajesh Ramachandran, Peijun Zhang () and Marijn G. J. Ford ()
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Dapeng Sun: University of Pittsburgh School of Medicine
Natalia V. Varlakhanova: University of Pittsburgh School of Medicine
Bryan A. Tornabene: University of Pittsburgh School of Medicine
Rajesh Ramachandran: Case Western Reserve University School of Medicine
Peijun Zhang: University of Pittsburgh School of Medicine
Marijn G. J. Ford: University of Pittsburgh School of Medicine

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Sorting nexins (SNX) are a family of PX domain-containing proteins with pivotal roles in trafficking and signaling. SNX-BARs, which also have a curvature-generating Bin/Amphiphysin/Rvs (BAR) domain, have membrane-remodeling functions, particularly at the endosome. The minimal PX-BAR module is a dimer mediated by BAR-BAR interactions. Many SNX-BAR proteins, however, additionally have low-complexity N-terminal regions of unknown function. Here, we present the cryo-EM structure of the full-length SNX-BAR Mvp1, which is an autoinhibited tetramer. The tetramer is a dimer of dimers, wherein the membrane-interacting BAR surfaces are sequestered and the PX lipid-binding sites are occluded. The N-terminal low-complexity region of Mvp1 is essential for tetramerization. Mvp1 lacking its N-terminus is dimeric and exhibits enhanced membrane association. Membrane binding and remodeling by Mvp1 therefore requires unmasking of the PX and BAR domain lipid-interacting surfaces. This work reveals a tetrameric configuration of a SNX-BAR protein that provides critical insight into SNX-BAR function and regulation.

Date: 2020
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DOI: 10.1038/s41467-020-15110-5

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