Heat Shock Protein 40 (Heat Shock 40kD Protein 1, HSP40, DnaJ Homolog Subfamily B Member 1, DNAJB1, DnaJ Protein Homolog 1, DNAJ1, HSPF1, Human DnaJ Protein 1, HDJ1, hDj-1, RSPH16B, Sis1)

Human Hsp40/DnaJ proteins comprise a large protein family, members of which feature the J domain (named after the bacterial DnaJ protein) (1). The J-domain spans the first 75 N-terminal amino acids and is separated from the C-terminal by a glycine/phenylalanine-rich domain (2). There are two main types of Hsp40; type 1 DNAJ proteins including HDJ2 and yeast YdjI; type II includes yeast Sis1 and human Hdj1. Whereas type I possesses a zinc finger domain which helps in the function of protein folding. (3, 4), type II does not. Members of the Hsp40/DnaJ family play diverse roles in many cellular processes, such as folding, translocation, \ndegradation and assembly of multi-protein complexes. Hsp40 stimulates the ATPase activity of Hsp70 which in turn causes conformational changes of the unfolded proteins (5, 6). The Hsp40-Hsp70-unfolded protein complex further binds to co-chaperones Hip, Hop and HSP90 which leads to protein folding, or components of protein degradation machinery CHIP and BAG-1 (7). \n\nApplications:\nSuitable for use in ELISA, Western Blot and Immunoprecipitation. Other applications not tested.\n\nRecommended Dilution:\nWestern Blot:1:2000\nOptimal dilutions to be determined by the researcher.\n\nStorage and Stability:\nMay be stored at 4 degrees C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20 degrees C. Aliquots are stable for at least 12 months. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.

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