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Hsp70s and lysosomal proteolysis

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Abstract

Confluent cultured cells activate a lysosomal pathway of polypeptide breakdown in response to withdrawal of serum growth factors. The substrates for this proteolytic pathway are a restricted class of cytosolic polypeptides containing peptide sequences biochemically related to lysine-phenylalanine-glutamate-arginine-glutamine, or, in single amino acid abbreviations, KFERQ. The heat shock cognate protein of 73 kD (hsc73) binds to a variety of polypeptides via this molecular determinant and facilitates their lysosomal import and degradation. In addition, a portion of intracellular hsc73 resides within the lysosome and appears to be an essential component of the proteolytic machinery. Several potential mechanisms by which hsc73 mediates selective lysosomal import and degradation of polypeptides are discussed.

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  1. Department of Biology, University of California, San Diego, 9500 Gilman Drive, 92093-0322, La Jolla, California, USA

    S. R. Terlecky

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Terlecky, S.R. Hsp70s and lysosomal proteolysis. Experientia 50, 1021–1025 (1994). https://doi.org/10.1007/BF01923456

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