BAX inhibitor-1 is a negative regulator of the ER stress sensor IRE1alpha.
BAX inhibitor-1 is a negative regulator of the ER stress sensor IRE1alpha.
复制标题
DOI:
10.1016/j.molcel.2009.02.017
复制
发表时间:
2009-03-27
期刊:
影响因子:
16
通讯作者:
Hetz, Claudio
中科院分区:
文献类型:
--
作者:
Lisbona, Fernanda;Rojas-Rivera, Diego;Thielen, Peter;Zamorano, Sebastian;Todd, Derrick;Martinon, Fabio;Glavic, Alvaro;Kress, Christina;Lin, Jonathan H.;Walter, Peter;Reed, John C.;Glimcher, Laurie H.;Hetz, Claudio
Adaptation to endoplasmic reticulum (ER) stress depends on the activation of an integrated signal transduction pathway known as the unfolded protein response (UPR). Bax inhibitor-1 (BI-1) is an evolutionarily conserved ER-resident protein that suppresses cell death. Here we have investigated the role of BI-1 in the UPR. BI-1 expression suppressed IRE1α activity in fly and mouse models of ER stress. BI-1 deficient cells displayed hyperactivation of the ER stress sensor IRE1α, leading to increased levels of its downstream target X-Box binding protein-1 (XBP-1) and upregulation of UPR target genes. This phenotype was associated with the formation of a stable protein complex between BI-1 and IRE1α, decreasing its ribonuclease activity. Finally, BI-1 deficiency increased the secretory activity of primary B cells, a phenomenon regulated by XBP-1. Our results suggest a new role for BI-1 in early adaptive responses against ER stress which contrasts with its known downstream function in apoptosis.
登录
查看更多内容
影响因子:
11.4
作者:
Lee, AH;Chu, GC;Glimcher, LH
通讯作者:
Glimcher, LH
影响因子:
64.8
作者:
Calfon, M;Zeng, HQ;Ron, D
通讯作者:
Ron, D
影响因子:
56.9
作者:
Lee, Ann-Hwee;Scapa, Erez F.;Glimcher, Laurie H.
通讯作者:
Glimcher, Laurie H.
影响因子:
16
作者:
Chae, HJ;Kim, HR;Reed, JC
通讯作者:
Reed, JC
影响因子:
4.8
作者:
Lee, Geum-Hwa;Kim, Hyun-Kyung;Chae, Han-Jung
通讯作者:
Chae, Han-Jung