Glucose Regulated Protein 94 (Grp94, gp96, ECGP, Endoplasmin, Heat Shock Protein 90kD beta Member 1, HSP90b1, Stress Inducible Tumor Rejection Antigen gp96, Tumor Rejection Antigen 1, TRA1)

Glucose-regulated protein 94, also known as Grp94 or gp96, is an abundant resident endoplasmic reticulum (ER) lumenal stress protein which together with cytosolic Hsp90 belongs to the Hsp90 family of molecular chaperones. Grp94 and other resident soluble proteins of the ER such as members of the Ca(2+) binding protein subfamily (CaBP), CaBPI and CaBP2 as well as calreticulin, possess the COOH-terminal tetrapeptide Lys-Asp-Glu-Leu (KDEL) which is a sorting signal that is thought to lead to the retention of these proteins in the pre-Golgi compartments (1). Grp94 expression is upregulated by stress conditions such as lucose starvation and heat shock, which promote protein misfolding or unfolding (2). In addition to a homeostatic role in protein folding and assembly, Grp94 can function in the intracellular trafficking of peptides from the extracellular space to the MHC class I antigen processing pathway of antigen presentation cells (3,4). Grp94 and Hsp90 share high sequence identity and presumably identical adenosine nucleotide-dependent modes of regulation. Earlier data suggests that Hsp90 and Grp94 may differ in their nucleotide binding properties. The N-terminal domain of eukaryotic Hsp90 proteins contains a conserved adenosine nucleotide binding pocket which also serves as the inding site for the Hsp90 inhibitors geldanamycin and radicicol. However, the molecular basis for adenosine nucleotide-dependent regulation of Grp94remains to be established. Recent data has entified a ligand dependent regulation of Grp94 function and suggest a model whereby Grp94 function is regulated through a ligand-dependent conversion of Grp94 from an inactive to an active conformation (5, 6).\n\nPositive Control: 3T3 lysate

Prices direct from United States Biological

Quick response times

Exclusive Biosave savings/discounts

SPECIFICATIONS

Catalog Number

G3057-44B

Size

100ug

Hosts

Goat

Reactivities

Mouse, Rat, Can

Form

Supplied as a liquid in Tris-saline, pH7.2, 0.5% BSA.

P Type

Pab

Purity

Purified by immunoaffinity chromatography.

Isotype

IgG

References

Stojkovic M, Lako M, Stojkovic P, Stewart R, Przyborski S, Armstrong L, Evans J, Herbert M, Hyslop L, Ahmad S, Murdoch A, Strachan T. Derivation of human embryonic stem cells from day-8 blastocysts recovered after three-step in vitro culture. Stem Cells. 2004;22(5):790-7. PMID: 15342943

Additional Info

Species Crossreactivity: Mouse. Other species not tested. Expected based upon sequence homology: Mouse, Rat, canine