Download MendeleyThe molecular basis for the endocytosis of small R-SNAREs by the clathrin adaptor CALM.
Miller, S.E., Sahlender, D.A., Graham, S.C., Honing, S., Robinson, M.S., Peden, A.A., Owen, D.J.(2011) Cell 147: 1118-1131
- PubMed: 22118466
- DOI: https://doi.org/10.1016/j.cell.2011.10.038
- Primary Citation of Related Structures:
3ZYK, 3ZYL, 3ZYM - PubMed Abstract:
SNAREs provide a large part of the specificity and energy needed for membrane fusion and, to do so, must be localized to their correct membranes. Here, we show that the R-SNAREs VAMP8, VAMP3, and VAMP2, which cycle between the plasma membrane and endosomes, bind directly to the ubiquitously expressed, PtdIns4,5P(2)-binding, endocytic clathrin adaptor CALM/PICALM. X-ray crystallography shows that the N-terminal halves of their SNARE motifs bind the CALM(ANTH) domain as helices in a manner that mimics SNARE complex formation. Mutation of residues in the CALM:SNARE interface inhibits binding in vitro and prevents R-SNARE endocytosis in vivo. Thus, CALM:R-SNARE interactions ensure that R-SNAREs, required for the fusion of endocytic clathrin-coated vesicles with endosomes and also for subsequent postendosomal trafficking, are sorted into endocytic vesicles. CALM's role in directing the endocytosis of small R-SNAREs may provide insight into the association of CALM/PICALM mutations with growth retardation, cognitive defects, and Alzheimer's disease.
Organizational Affiliation:
Cambridge Institute for Medical Research and Department of Clinical Biochemistry, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0XY, UK.
