Clathrin-associated proteins of bovine brain coated vesicles. An analysis of their number and assembly-promoting activity - PubMed (original) (raw)
. 1992 Aug 15;267(23):16567-73.
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- PMID: 1644836
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Clathrin-associated proteins of bovine brain coated vesicles. An analysis of their number and assembly-promoting activity
R Lindner et al. J Biol Chem. 1992.
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Abstract
In search of hitherto undiscovered coat proteins, clathrin-associated proteins (APs) from coated vesicles of bovine brain were affinity-purified by one cycle of coat assembly and fractionated by gel filtration on Superose 6. Immunochemical and gel electrophoretic analysis of the fractions revealed, besides AP180, auxilin, HA1, and HA2, a component with M(r) approximately 140,000. This protein (p140) is present in coated vesicles in about equimolar proportion to auxilin. The contribution of HA1, HA2, AP180, and auxilin to the total assembly activity in the Tris-soluble coat protein fraction were quantitatively analyzed by measuring the reduction in activity when each protein was removed from the mixture by immunoaffinity chromatography. It was found that AP180 accounts for 61% and HA2 for 33% of the activity, whereas auxilin, HA1, and p140 made a negligible contribution. Based on the relative molar concentration of APs in the coat protein fraction, AP180 is about 4 times more active in promoting clathrin assembly than are HA2 or the other APs.
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