Molecular basis for SNX-BAR-mediated assembly of distinct endosomal sorting tubules
2012 (English)In: EMBO Journal, ISSN 0261-4189, E-ISSN 1460-2075, Vol. 31, no 23, 4466-4480 p.Article in journal (Refereed) Published
Sorting nexins (SNXs) are regulators of endosomal sorting. For the SNX-BAR subgroup, a Bin/Amphiphysin/Rvs (BAR) domain is vital for formation/stabilization of tubular subdomains that mediate cargo recycling. Here, by analysing the in vitro membrane remodelling properties of all 12 human SNX-BARs, we report that some, but not all, can elicit the formation of tubules with diameters that resemble sorting tubules observed in cells. We reveal that SNX-BARs display a restricted pattern of BAR domain-mediated dimerization, and by resolving a 2.8 angstrom structure of a SNX1-BAR domain homodimer, establish that dimerization is achieved in part through neutralization of charged residues in the hydrophobic BAR-dimerization interface. Membrane remodelling also requires functional amphipathic helices, predicted to be present in all SNX-BARs, and the formation of high order SNX-BAR oligomers through selective 'tip-loop' interactions. Overall, the restricted and selective nature of these interactions provide a molecular explanation for how distinct SNX-BAR-decorated tubules are nucleated from the same endosomal vacuole, as observed in living cells. Our data provide insight into the molecular mechanism that generates and organizes the tubular endosomal network.
Place, publisher, year, edition, pages
2012. Vol. 31, no 23, 4466-4480 p.
BAR domain, phosphoinositide, retromer, sorting nexin, VPS35
Cell and Molecular Biology
IdentifiersURN: urn:nbn:se:umu:diva-63025DOI: 10.1038/emboj.2012.283ISI: 000311828400010OAI: oai:DiVA.org:umu-63025DiVA: diva2:581122