Heat shock protein 90AB1 and hyperthermia rescue infectivity of HIV with defective cores.

Heat shock protein 90AB1 and hyperthermia rescue infectivity of HIV with defective cores.
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DOI:
10.1016/j.virol.2012.11.005
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发表时间:
2013-02-05
期刊:
影响因子:
3.7
通讯作者:
Stoddart CA
Stoddart CA
中科院分区:
医学3区
文献类型:
--
作者:
Joshi P;Sloan B;Torbett BE;Stoddart CA

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我们之前的研究表明,通过细胞激活或增加胞浆热休克蛋白90家族成员HSP90AB1的表达,可以降低未完全加工的衣壳间隔物蛋白1(CA-SP1)的传染性。在这里,我们证明了HSP90AB1存在于HIV病毒粒子中,HSP90AB1,而不是无功能的突变HSP90AB1E42A+D88A,通过CA中改变核心稳定性的突变恢复了对HIV的传染性。此外,CA突变体对HSP90AB1的药理抑制高度敏感。与此一致的是,我们发现,在39.5C的温度下培养艾滋病毒,可将人外周血单个核细胞中的病毒传染性提高30倍(p=0.002),并挽救未激活细胞中CA突变的传染性,同时在高温期间HSP90AB1的表达增加。总之,HSP90AB1对CA突变的HIV感染性的跨显性效应表明,这类细胞伴侣在HIV核心稳定和脱壳方面具有潜在的作用。
We previously showed that reduced infectivity of HIV with incompletely processed capsid-spacer protein 1 (CA-SP1) is rescued by cellular activation or increased expression of HSP90AB1, a member of the cytosolic heat shock protein 90 family. Here we show that HSP90AB1 is present in HIV virions and that HSP90AB1, but not nonfunctional mutated HSP90AB1E42A+D88A, restores infectivity to HIV with mutations in CA that alter core stability. Further, the CA mutants were hypersensitive to pharmacological inhibition of HSP90AB1. In agreement with, we found that culturing HIV at 39.5 °C enhanced viral infectivity up to 30-fold in human peripheral blood mononuclear cells (p = 0.002) and rescued CA-mutant infectivity in nonactivated cells, concurrent with elevated expression of HSP90AB1 during hyperthermia. In sum, the transdominant effect of HSP90AB1 on CA-mutant HIV infectivity suggests a potential role for this class of cellular chaperones in HIV core stability and uncoating.
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