Coat assembly directs v-SNARE concentration into synthetic COPII vesicles - PubMed (original) (raw)
Coat assembly directs v-SNARE concentration into synthetic COPII vesicles
K Matsuoka et al. Mol Cell. 1998 Nov.
Free article
Abstract
COPII proteins are required to create transport vesicles and to select cargo molecules for transit from the ER. A reconstituted liposome budding reaction was used to detect the capture and concentration of membrane-associated v-SNARE molecules into synthetic COPII vesicles. A novel glutathione-phosphatidyl-ethanolamine conjugate (Glut-PE) was synthesized and incorporated into chemically defined liposomes to provide binding sites for GST hybrid proteins. Large liposomes containing bound cytoplasmic domains of the v-SNAREs, Sec22p or Bos1p, or of the ER resident proteins, Sec12p and Ufe1p, were exposed to COPII proteins and GMP-PNP. v-SNAREs but not resident proteins were concentrated in synthetic COPII vesicles generated from donor liposomes. We conclude that COPII proteins are necessary and sufficient for cargo selection and vesicle morphogenesis.
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