Interaction of the PAS B domain with HSP90 accelerates hypoxia-inducible factor-1α stabilization

被引:102
作者
Katschinski, DM
Le, L
Schindler, SG
Thomas, T
Voss, AK
Wenger, RH
机构
[1] Univ Halle Wittenberg, Cell Physiol Grp, Fac Med, D-06112 Halle An Der Saale, Germany
[2] Univ Lubeck, Inst Physiol, Lubeck, Germany
[3] Walter & Eliza Hall Inst Med Res, Melbourne, Vic 3050, Australia
[4] Univ Zurich, Inst Physiol, CH-8006 Zurich, Switzerland
关键词
chaperone; geldanamycin; gene regulation; hyperthermia; oxygen; prolyl hydroxylation; proteasome;
D O I
10.1159/000080345
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Hypoxia-inducible factor (HIF) alpha subunits are induced under hypoxic conditions, when limited oxygen supply prevents prolyl hydroxylation-dependent binding of the ubiquitin ligase pVHL and subsequent proteasomal degradation. A short normoxic half-life of HIF-alpha and a very rapid hypoxic protein stabilization are crucial to the cellular adaptation to changing oxygen supply. However, the molecular requirements for the unusually rapid mechanisms of protein synthesis, folding and nuclear translocation are not well understood. We and others previously found that the chaperone heat-shock protein 90 (HSP90) can interact with HIF-1alpha in vitro. Here we show that HSP90 also interacts with HIF-2alpha and HIF-3alpha, suggesting a general involvement of HSP90 in HIF-alpha stabilization. The PAS B domain, common to all three alpha subunits, was required for HSP90 interaction. ARNT competed with HSP90 for binding to the PAS B domain since an excess of either component inhibited the activity of the other. HSP90 as well as the heterocomplex members HSP70 and p23, but not HSP40, were detected in immunoprecipitations of endogenous cellular HIF-1alpha. While HSP90 and HSP70 bound to HIF-1alpha predominantly under normoxic conditions, ARNT bound to HIF-1alpha primarily under hypoxic conditions, suggesting that ARNT displaced HSP90 from HIF-1alpha following nuclear translocation. Hypoxic accumulation of HIF-1alpha was delayed in a novel cell model deficient for HSP90beta as well as after treatment of wild-type cells with the HSP90 inhibitor geldanamycin, suggesting that HSP90 activity is involved in the rapid HIF-1alpha protein induction. Copyright (C) 2004 S. Karger AG, Basel.
引用
收藏
页码:351 / 360
页数:10
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