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We have cloned and sequenced beta-COP, a peripheral 110 kd Golgi membrane protein. beta-COP shows significant homology to beta-adaptin. It is present in a membrane-bound form and in a cytosolic complex of 13-14S, with a Stokes radius of approximately 10 nm and an estimated Mr of approximately 550,000. By immunofluorescence labeling, beta-COP is associated with the structures of the Golgi complex. Immunoelectron microscopy has localized beta-COP to non-clathrin-coated vesicles and cisternae of the Golgi complex. These coated vesicles accumulate in rat liver Golgi fractions treated with GTP gamma S and strongly label for beta-COP. Our data suggest that beta-COP is a component of a coat associated with vesicles and cisternae of the Golgi complex.
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