GRP78 Antibodies

Target Information

Endoplasmic reticulum chaperone that plays a key role in protein folding and quality control in the endoplasmic reticulum lumen. Involved in the correct folding of proteins and degradation of misfolded proteins via its interaction with DNAJC10/ERdj5, probably to facilitate the release of DNAJC10/ERdj5 from its substrate. Acts as a key repressor of the ERN1/IRE1-mediated unfolded protein response (UPR). In the unstressed endoplasmic reticulum, recruited by DNAJB9/ERdj4 to the luminal region of ERN1/IRE1, leading to disrupt the dimerization of ERN1/IRE1, thereby inactivating ERN1/IRE1. Accumulation of misfolded protein in the endoplasmic reticulum causes release of HSPA5/BiP from ERN1/IRE1, allowing homodimerization and subsequent activation of ERN1/IRE1. Plays an auxiliary role in post-translational transport of small presecretory proteins across endoplasmic reticulum (ER). May function as an allosteric modulator for SEC61 channel-forming translocon complex, likely cooperating with SEC62 to enable the productive insertion of these precursors into SEC61 channel. Appears to specifically regulate translocation of precursors having inhibitory residues in their mature region that weaken channel gating. Belongs to the heat shock protein 70 family. Note: This description may include information from UniProtKB.

Alternate Names

78 kDa glucose-regulated protein; Binding-immunoglobulin protein; BiP; Endoplasmic reticulum chaperone BiP; Endoplasmic reticulum lumenal Ca(2+)-binding protein grp78; epididymis secretory sperm binding protein Li 89n; FLJ26106; glucose-regulated protein, 78kDa; GRP-78; GRP78; Heat shock 70 kDa protein 5; heat shock 70kD protein 5 (glucose-regulated protein, 78kD); heat shock 70kDa protein 5 (glucose-regulated protein, 78kDa); Heat shock protein 70 family protein 5; heat shock protein family A (Hsp70) member 5; Heat shock protein family A member 5; Heat-shock 70kD protein-5 (glucose-regulated protein, 78kD); HEL-S-89n; HSP70 family protein 5; HSPA5; Immunoglobulin heavy chain-binding protein; MIF2