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PMID: 8432727 Published · ppublish English Comparative Study Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S.

Cytosolic Sec13p complex is required for vesicle formation from the endoplasmic reticulum in vitro.

The Journal of cell biology ·Vol. 120 ·No. 4 ·1993-02-00 ·Pages 865-75

Pryer NK, Salama NR, Schekman R, Kaiser CA

Abstract

The SEC13 gene of Saccharomyces cerevisiae is required in vesicle biogenesis at a step before or concurrent with the release of transport vesicles from the ER membrane. SEC13 encodes a 33-kD protein with sequence homology to a series of conserved internal repeat motifs found in beta subunits of heterotrimeric G proteins. The product of this gene, Sec13p, is a cytosolic protein peripherally associated with membranes. We developed a cell-free Sec13p-dependent vesicle formation reaction. Sec13p-depleted membranes and cytosol fractions were generated by urea treatment of membranes and affinity depletion of a Sec13p-dihydrofolate reductase fusion protein, respectively. These fractions were unable to support vesicle formation from the ER unless cytosol containing Sec13p was added. Cytosolic Sec13p fractionated by gel filtration as a large complex of about 700 kD. Fractions containing the Sec13p complex restored activity to the Sec13p- dependent vesicle formation reaction. Expression of SEC13 on a multicopy plasmid resulted in overproduction of a monomeric form of Sec13p, suggesting that another member of the complex becomes limiting when Sec13p is overproduced. Overproduced, monomeric Sec13p was inactive in the Sec13p-dependent vesicle formation assay.

Related Genes
MeSH Terms
Alleles Amino Acid Sequence Base Sequence Cloning, Molecular Consensus Sequence Endoplasmic Reticulum/metabolism,physiology Fungal Proteins/metabolism Genes, Fungal Macromolecular Substances Membrane Proteins/metabolism Molecular Sequence Data Mutagenesis, Insertional Nuclear Pore Complex Proteins Organelles/metabolism Restriction Mapping Saccharomyces cerevisiae/metabolism Saccharomyces cerevisiae Proteins Sequence Alignment
Chemicals
Fungal Proteins Macromolecular Substances Membrane Proteins Nuclear Pore Complex Proteins SEC13 protein, S cerevisiae Saccharomyces cerevisiae Proteins
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Pryer N K
Department of Molecular and Cell Biology, University of California, Berkeley 94720.
Salama N R
Schekman R
Kaiser C A
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46 references, click to expand
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Article Info
Journal
The Journal of cell biology
Abbr.
J Cell Biol
ISSN
0021-9525
Published
1993-02-00
Pages
865-75
Language
English
Region
United States
NLM ID
0375356
PMCID
PMC2200066
Subset
IM
Grants
NIGMS NIH HHS · GM 26755 · United States
Databases
GENBANK
L05929
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