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Papers In Press, published online ahead of print April 11, 2002
Dept. of Molecular and Cell Biology, University of California Berkeley, Berkeley, CA 94720
Corresponding Author: schekman{at}uclink4.berkeley.edu
The yeast plasma membrane H+-ATPase, Pma1p, is one of the most abundant proteins to traverse the secretory pathway. Newly synthesized Pma1p exits the endoplasmic reticulum (ER) via COPII-coated vesicles bound for the Golgi. Unlike most secreted proteins, efficient incorporation of Pma1p into COPII vesicles requires the Sec24p homolog, Lst1p, suggesting a unique role for Lst1p in ER export. Vesicles formed with mixed Sec24p/Lst1p coats are larger than those with Sec24p alone. Here we examine the relationship between Pma1p biosynthesis and the requirement for this novel coat subunit. We show that Pma1p forms a large oligomeric complex of >1 MDa in the ER, which is packaged into COPII vesicles. Furthermore, oligomerization of Pma1p is linked to membrane lipid composition; Pma1p is rendered monomeric in cells depleted of ceramide, suggesting that association with lipid rafts may influence oligomerization. Surprisingly, monomeric Pma1p present in ceramide-deficient membranes can be exported from the ER in COPII-vesicles in a reaction that is stimulated by Lst1p. We suggest that Lst1p directly conveys Pma1p into a COPII vesicle and that the larger size of Lst1/Sec24p mixed COPII vesicles is not essential to the packaging of large oligomeric complexes.
J. Biol. Chem, 10.1074/jbc.M200450200
Submitted on January 15, 2002
Revised on April 9, 2002
Accepted on April 10, 2002
Ceramide biosynthesis is required for the formation of oligomeric H+-ATPase, Pma1p, in the yeast endoplasmic reticulum
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