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Science 20 October 1989:
Vol. 246. no. 4928, pp. 382 - 385
DOI: 10.1126/science.2799391
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Articles

Science, Vol 246, Issue 4928, 382-385
Copyright © 1989 by American Association for the Advancement of Science

articles

A role for a 70-kilodalton heat shock protein in lysosomal degradation of intracellular proteins

HL Chiang, Terlecky SR, CP Plant, and JF Dice

Department of Physiology, Tufts University School of Medicine, Boston, MA 02111.

A 73-kilodalton (kD) intracellular protein was found to bind to peptide regions that target intracellular proteins for lysosomal degradation in response to serum withdrawal. This protein cross-reacted with a monoclonal antibody raised to a member of the 70-kD heat shock protein (hsp70) family, and sequences of two internal peptides of the 73-kD protein confirm that it is a member of this family. In response to serum withdrawal, the intracellular concentration of the 73-kD protein increased severalfold. In the presence of adenosine 5'-triphosphate (ATP) and MgCl2, the 73-kD protein enhanced protein degradation in two different cell-free assays for lysosomal proteolysis.


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