UGGT is part of the ER quality control system of glycoprotein folding and its activity increases the potential for correctly folded glycoproteins.The main proteins involved in the ER quality control system are UGGT, the ER lectin chaperones (calnexin and calreticulin), and glucosidase II. UGGT first recognizes the incompletely folded glycoprotein and monoglucosylates it. The lectins, calnexin and calreticulin, have high affinities for monoglucosylated proteins and the ER chaperones that associate with these lectins assist the folding of the misfolded glycoprotein. Subsequently, glucosidase II will deglucosylate the glycoprotein. If the glycoprotein is still misfolded, UGGT will re-glucosylate it and allow it to go through the cycle again.
Background References
1. Arnold S.M. et. al. Two homologues encoding human UDP-glucose:glycoprotein glucosyltransferase differ in mRNA expression and enzymatic activity. Biochemistry 39:2149-2163(2000).
Western blot analysis of UGGT1 on different lysates with Rabbit anti-UGGT1 antibody (HA500025) at 1/1,000 dilution.
Lane 1: HL-60 cell lysate (10 µg/Lane) Lane 2: HepG2 cell lysate (10 µg/Lane) Lane 3: Mouse liver tissue lysate (20 µg/Lane) Lane 4: Mouse kidney tissue lysate (20 µg/Lane) Lane 5: Rat liver tissue lysate (20 µg/Lane) Lane 6: Rat brain tissue lysate (20 µg/Lane)
Predicted band size: 177 kDa Observed band size: 177 kDa
Exposure time: 6 seconds; ECL: K1801;
4-20% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (HA500025) at 1/1,000 dilution was used in primary antibody dilution (K1803) at 4℃ overnight. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1/50,000 dilution was used for 1 hour at room temperature.
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