The dynamin-like protein Vps1p of the yeast Saccharomyces cerevisiae associates with peroxisomes in a Pex19p-dependent manner

The Journal of Biological Chemistry
Franco J VizeacoumarRichard A Rachubinski

Abstract

Dynamins and dynamin-like proteins play important roles in organelle division. In Saccharomyces cerevisiae, the dynamin-like protein Vps1p (vacuolar protein sorting protein 1) is involved in peroxisome fission, as cells deleted for the VPS1 gene contain reduced numbers of enlarged peroxisomes. What relationship Vps1p has with peroxisomes remains unclear. Here we show that Vps1p interacts with Pex19p, a peroxin that acts as a shuttling receptor for peroxisomal membrane proteins or as a chaperone assisting the assembly/stabilization of proteins at the peroxisome membrane. Vps1p contains two putative Pex19p recognition sequences at amino acids 509-523 and 633-647. Deletion of the first (but not the second) sequence results in reduced numbers of enlarged peroxisomes in cells, as in vps1delta cells. Deletion of either sequence has no effect on vacuolar morphology or vacuolar protein sorting, suggesting that the peroxisome and vacuole biogenic functions of Vps1p are separate and separable. Substitution of proline for valine at position 516 of Vps1p abrogates Pex19p binding and gives the peroxisome phenotype of vps1delta cells. Microscopic analysis showed that overexpression of Pex19p or redirection of Pex19p to the nucleus does not a...Continue Reading

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