Clathrin and coated vesicle proteins Immunological characterization - PubMed (original) (raw)
. 1981 Mar 10;256(5):2538-44.
- PMID: 7007386
Free article
Clathrin and coated vesicle proteins Immunological characterization
J H Keen et al. J Biol Chem. 1981.
Free article
Abstract
Antisera to a purified extract of bovine brain coated vesicles have been prepared. The extract contained clathrin (greater than 90%) and polypeptides of 35,000 (less than 5%) and 38,000 (less than 5%) molecular weight. Antibodies to clathrin were affinity purified on a homogeneous clathrin-Sepharose column and demonstrated to be monospecific by sensitive immunoprecipitation and immunofluorescence experiments. These antibodies give a fluorescence pattern consistent with coated pit localization in cultured cells from diverse species indicating extensive cross-reaction, and, thus, conservation of the clathrin antigen. Antibodies to the lower molecular weight proteins (LMWP) present in the clathrin preparation were also affinity purified on a column containing these polypeptides but devoid of clathrin. These antibodies cross-reacted completely and immunoprecipitated only clathrin from 3T3 cell extracts. Although the molecular weights and isoelectric points of the LMWP presented are quite similar to tropomyosins, these immunological results and limited protease digestion data indicate that tropomyosin and the LMWP are not related. Rather, the latter may be breakdown products of clathrin.
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