| 背景信息 |
DnaJ heat shock protein family (Hsp40) member B11 (DNAJB11), also known as ERdj3, is a soluble glycoprotein and Type II HSP40 co-chaperone localized to the lumen of the endoplasmic reticulum (ER). It features an N-terminal J-domain that stimulates the ATPase activity of BiP (HSPA5), a master chaperone in the ER. DNAJB11 is unique among HSP40 family members due to its ability to form tetramers, a structural feature that enhances its substrate-binding capacity and facilitates ATP-independent chaperoning. It plays a vital role in protein folding, trafficking, and the degradation of secretory clients such as immunoglobulins and glucocerebrosidase. By coordinating ER-extracellular proteostasis, DNAJB11 ensures the quality control of proteins entering the secretory pathway, particularly during periods of ER stress. Its function is essential for maintaining cellular proteostasis and preventing the accumulation of misfolded proteins. |