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To complete the molecular characterization of coatomer, the preformed cytosolic complex that is involved in the formation of biosynthetic transport vesicles, we have cloned and characterized the gene for non-clathrin-coat protein alpha (alpha-COP) from Saccharomyces cerevisiae. The derived protein, molecular weight of 135,500, contains four WD-40 repeated motifs (Trp/Asp-containing motifs of approximately 40 amino acids). Disruption of the yeast alpha-COP gene is lethal. Comparison of the DNA-derived primary structure with peptides from bovine alpha-COP shows a striking homology. alpha-COP is localized to coated transport vesicles and coated buds of Golgi membranes derived from CHO cells.

Non-clathrin-coat protein alpha is a conserved subunit of coatomer and in Saccharomyces cerevisiae is essential for growth.