A novel quality control compartment derived from the endoplasmic reticulum

被引:161
作者
Kamhi-Nesher, S [1 ]
Shenkman, M [1 ]
Tolchinsky, S [1 ]
Fromm, SV [1 ]
Ehrlich, R [1 ]
Lederkremer, GZ [1 ]
机构
[1] Tel Aviv Univ, George S Wise Fac Life Sci, Dept Cell Res & Immunol, IL-69978 Tel Aviv, Israel
关键词
D O I
10.1091/mbc.12.6.1711
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Degradation of proteins that, because of improper or suboptimal processing, are retained in the endoplasmic reticulum (ER) involves retrotranslocation to reach the cytosolic ubiquitin-proteasome machinery. We found that substrates of this pathway, the precursor of human asialoglycoprotein receptor H2a and free heavy chains of murine class I major histocompatibility complex (MHC), accumulate in a novel preGolgi compartment that is adjacent to but not overlapping with the centrosome, the Golgi complex, and the ER-to-Golgi intermediate compartment (ERGIC). On its way to degradation, H2a associated increasingly after synthesis with the ER translocon Sec61. Nevertheless, it remained in the secretory pathway upon proteasomal inhibition, suggesting that its retrotranslocation must be tightly coupled to the degradation process. In the presence of proteasomal inhibitors, the ER chaperones calreticulin and calnexin, but not BiP, PDI, or glycoprotein glucosyltransferase, concentrate in the subcellular region of the novel compartment. The "quality control" compartment is possibly a subcompartment of the ER. It depends on microtubules but is insensitive to brefeldin A. We discuss the possibility that it is also the site for concentration and retrotranslocation of proteins that, like the mutant cystic fibrosis transmembrane conductance regulator, are transported to the cytosol, where they form large aggregates, the "aggresomes."
引用
收藏
页码:1711 / 1723
页数:13
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