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78 kDa Glucose-Regulated Protein (GRP78)

Target: GRP78
Molecular classification: Heat Shock Protein, Molecular Chaperone

Overview

GRP78 (also known as BiP or HSPA5) is a key ER-resident chaperone protein involved in protein folding, assembly, and degradation. It plays a crucial role in regulating the unfolded protein response (UPR) and is essential for maintaining cellular proteostasis, particularly under stress conditions. Its overexpression on tumor cell surfaces makes it an attractive therapeutic target for cancer, while it also contributes to the pathogenesis of diabetic nephropathy and cardiac hypertrophy.

Other names: BiPHSPA5Heat shock 70 kDa protein 5

Mechanism of action

Inhibition of ATPase activity, modulation of protein folding and ER stress

Biological functions

Protein foldingProtein assemblyER-associated degradation (ERAD)Unfolded protein response (UPR) regulationAnti-apoptoticProteostasis maintenance

Disease associations

Cancer progression/survivalDiabetic nephropathyCardiac hypertrophy

Safety considerations

Essential for embryonic development (knockout lethality)Potential for off-target effects due to homology with other HSP70 proteins

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