P-TEFb- the final frontier.

P-TEFb- the final frontier.
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DOI:
10.1186/1747-1028-4-19
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发表时间:
2009-09-02
期刊:
影响因子:
2.3
通讯作者:
Kohoutek J
Kohoutek J
中科院分区:
生物学3区
文献类型:
--
作者:
Kohoutek J

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基因表达的调控对单细胞和多细胞生物生理过程的各个方面都是必不可少的。它最终赋予细胞有效响应参与细胞周期、生长、分化和生存的细胞外和细胞内刺激的能力。基因表达的调控主要在RNA聚合酶II (RNAPII)对特定mrna的转录水平上执行,通常分为几个不同的阶段。其中,转录伸长受正转录伸长因子b (P-TEFb)的正调控,P-TEFb由CDK9和细胞周期蛋白T1、T2或k组成,P-TEFb通过磷酸化RNAPII中的羧基末端结构域(CTD)和负转录伸长因子,使转录伸长从无效向有效过渡。多年来,我们对P-TEFb复合物的分子组成、组装及其在特定基因转录中的作用有了大量的了解,但P-TEFb在其他生理过程中的功能直到最近才被发现。鉴于将P-TEFb与细胞周期、发育和几种疾病的调节联系起来的新发现,我想讨论这些观察结果以及未来的观点。
Regulation of gene expression is essential to all aspects of physiological processes in single-cell as well as multicellular organisms. It gives ultimately cells the ability to efficiently respond to extra- and intracellular stimuli participating in cell cycle, growth, differentiation and survival. Regulation of gene expression is executed primarily at the level of transcription of specific mRNAs by RNA polymerase II (RNAPII), typically in several distinct phases. Among them, transcription elongation is positively regulated by the positive transcription elongation factor b (P-TEFb), consisting of CDK9 and cyclin T1, T2 or K. P-TEFb enables transition from abortive to productive transcription elongation by phosphorylating carboxyl-terminal domain (CTD) in RNAPII and negative transcription elongation factors. Over the years, we have learned a great deal about molecular composition of P-TEFb complexes, their assembly and their role in transcription of specific genes, but function of P-TEFb in other physiological processes was not apparent until just recently. In light of emerging discoveries connecting P-TEFb to regulation of cell cycle, development and several diseases, I would like to discuss these observations as well as future perspectives.
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