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Sequestration of the Transcription Factor STAT3 by the Molecular Chaperone CCT: A Potential Mechanism for Modulation of STAT3 Phosphorylation

机译:通过分子伴分子伴分子蛋白CCT的转录因子STAT3的螯合:DET3磷酸化调节的潜在机制

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摘要

Chaperonin Containing Tailless complex polypeptide 1 (CCT) is an essential molecular chaperone required for the folding of the abundant proteins actin and tubulin. The CCT oligomer also folds a range of other proteins and participates in non-folding activities such as providing assembly support for complexes of the von Hippel Lindau tumor suppressor protein and elongins. Here we show that the oncogenic transcription factor STAT3 binds to the CCT oligomer, but does not display the early binding upon translation in rabbit reticulocyte lysate typical of an obligate CCT folding substrate. Consistent with this, depletion of each of the CCT subunits by siRNA targeting indicates that loss of CCT oligomer does not suppress the activation steps of STAT3 upon stimulation with IL-6: phosphorylation, dimerisation and nuclear translocation. Furthermore, the transcriptional activity of STAT3 is not negatively affected by reduction in CCT levels. Instead, loss of CCT oligomer in MCF7 cells leads to an enhancement of STAT3 phosphorylation at Tyr705, implicating a role for the CCT oligomer in the sequestration of non-phosphorylated STAT3. Thus, as CCT is dynamic oligomer, the assembly state and also abundance of CCT oligomer may provide a means to modulate STAT3 phosphorylation. (C) 2021 The Author(s). Published by Elsevier Ltd.
机译:含有无尾复合多肽1(CCT)的伴侣蛋白是丰富的肌动蛋白和微管蛋白折叠所必需的分子伴侣。CCT寡聚体还折叠一系列其他蛋白质,并参与非折叠活动,例如为von Hippel-Lindau肿瘤抑制蛋白和elongins的复合物提供组装支持。在这里,我们显示致癌转录因子STAT3与CCT寡聚体结合,但在兔网织红细胞裂解物中未显示出典型的专一性CCT折叠底物在翻译时的早期结合。与此一致的是,通过siRNA靶向使每个CCT亚单位缺失表明,CCT寡聚体的缺失不会抑制在IL-6刺激下STAT3的激活步骤:磷酸化、二聚化和核易位。此外,CCT水平的降低不会对STAT3的转录活性产生负面影响。相反,MCF7细胞中CCT寡聚体的缺失导致Tyr705处STAT3磷酸化的增强,这意味着CCT寡聚体在非磷酸化STAT3的隔离中发挥作用。因此,由于CCT是动态寡聚体,组装状态以及丰富的CCT寡聚体可能提供一种调节STAT3磷酸化的方法。(c)2021作者。爱思唯尔有限公司出版。

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