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ACS Chem Biol. 2014 Aug 15;9(8):1698-705. doi: 10.1021/cb500256u. Epub 2014 Jun 17.

Affinity purification probes of potential use to investigate the endogenous Hsp70 interactome in cancer.

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Program in Molecular Pharmacology and Chemistry and Department of Medicine and §Program in Molecular Biology, Proteomics Core, Memorial Sloan-Kettering Cancer Center , New York, New York 10021, United States.


Heat shock protein 70 (Hsp70) is a family of proteins with key roles in regulating malignancy. Cancer cells rely on Hsp70 to inhibit apoptosis, regulate senescence and autophagy, and maintain the stability of numerous onco-proteins. Despite these important biological functions in cancer, robust chemical tools that enable the analysis of the Hsp70-regulated proteome in a tumor-by-tumor manner are yet unavailable. Here we take advantage of a recently reported Hsp70 ligand to design and develop an affinity purification chemical toolset for potential use in the investigation of the endogenous Hsp70-interacting proteome in cancer. We demonstrate that these tools lock Hsp70 in complex with onco-client proteins and effectively isolate Hsp70 complexes for identification through biochemical techniques. Using these tools we provide proof-of-concept analyses that glimpse into the complex roles played by Hsp70 in maintaining a multitude of cell-specific malignancy-driving proteins.

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