Journal
MOLECULAR BIOLOGY OF THE CELL
Volume 18, Issue 4, Pages 1203-1219Publisher
AMER SOC CELL BIOLOGY
DOI: 10.1091/mbc.E06-11-1035
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Funding
- NCRR NIH HHS [P20 RR15563-06, P20 RR015563] Funding Source: Medline
- NIGMS NIH HHS [R01 GM026755, R01 GM26755] Funding Source: Medline
- NATIONAL CENTER FOR RESEARCH RESOURCES [P20RR015563] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM026755] Funding Source: NIH RePORTER
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The branching of exocytic transport routes in both yeast and mammalian cells has complicated studies of the late secretory pathway, and the mechanisms involved in exocytic cargo sorting and exit from the Golgi and endosomes are not well understood. Because cargo can be sorted away from a blocked route and secreted by an alternate route, mutants defective in only one route do not exhibit a strong secretory phenotype and are therefore difficult to isolate. In a genetic screen designed to isolate such mutants, we identified a novel conserved protein, Avl9p, the absence of which conferred lethality in a vps1 Delta apl2 Delta strain background (lacking a dynamin and an adaptor-protein complex 1 subunit). Depletion of Avl9p in this strain resulted in secretory defects as well as accumulation of Golgi-like membranes. The triple mutant also had a depolarized actin cytoskeleton and defects in polarized secretion. Overexpression of Avl9p in wild-type cells resulted in vesicle accumulation and a post-Golgi defect in secretion. Phylogenetic analysis indicated evolutionary relationships between Avl9p and regulators of membrane traffic and actin function.
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