The Cellular lysine methyltransferase Set7/9-KMT7 binds HIV-1 TAR RNA, monomethylates the viral transactivator Tat, and enhances HIV transcription.

The Cellular lysine methyltransferase Set7/9-KMT7 binds HIV-1 TAR RNA, monomethylates the viral transactivator Tat, and enhances HIV transcription.
复制标题

DOI:
10.1016/j.chom.2010.02.005
复制
发表时间:
2010-03-18
影响因子:
30.3
通讯作者:
Ott M
Ott M
中科院分区:
医学1区
文献类型:
--
作者:
Pagans S;Kauder SE;Kaehlcke K;Sakane N;Schroeder S;Dormeyer W;Trievel RC;Verdin E;Schnolzer M;Ott M

文献摘要

参考文献

被引文献

相似文献

HIV-1 Tat蛋白的翻译后修饰已成为微调病毒反激活子与TAR RNA和细胞辅因子相互作用的关键调控机制。在这里,我们发现赖氨酸甲基转移酶Set7/9(更名为KMT7)是一种新的HIV转录共激活因子。Set7/9-KMT7在体内与HIV启动子结合,并使赖氨酸51单甲基化,赖氨酸51是位于Tat rna结合域的高度保守残基。敲低Set7/9-KMT7可抑制HIV启动子Tat的转录激活,但不影响甲基化缺陷Tat (K51A)的转录活性。Set7/9-KMT7本身结合TAR RNA,并与Tat和正转录延伸因子P-TEFb形成复合物。我们的研究结果揭示了Set7/9-KMT7的新的rna结合特性,并证明了Tat甲基化在Tat转激活周期的早期步骤中的积极作用。
Posttranslational modifications of the HIV-1 Tat protein have emerged as critical regulatory mechanisms that fine-tune interactions of the viral transactivator with TAR RNA and cellular cofactors. Here, we identify the lysine methyltransferase Set7/9 (renamed KMT7) as a novel co-activator of HIV transcription. Set7/9-KMT7 associates with the HIV promoter in vivo and monomethylates lysine 51, a highly conserved residue located in the RNA-binding domain of Tat. Knockdown of Set7/9-KMT7 suppresses Tat transactivation of the HIV promoter, but does not affect the transcriptional activity of methylation-deficient Tat (K51A). Set7/9-KMT7 itself binds TAR RNA and forms a complex with Tat and the positive transcription elongation factor P-TEFb. Our findings uncover novel RNA-binding properties of Set7/9-KMT7 and demonstrate a positive role of Tat methylation in early steps of the Tat transactivation cycle.
DOI: 10.1186/1742-4690-3-48
发表时间: 2006-08-07
期刊: RETROVIROLOGY
影响因子: 3.3
作者:
Agbottah, Emmanuel;Deng, Longwen;Dannenberg, Luke O.;Pumfery, Anne;Kashanchi, Fatah
通讯作者: Kashanchi, Fatah
DOI: 10.1021/bi9907274
发表时间: 1999-07-06
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
Creaven, M;Hans, F;Khochbin, S
通讯作者: Khochbin, S
DOI: 10.1093/emboj/cdf669
发表时间: 2002-12-16
期刊: EMBO JOURNAL
影响因子: 11.4
作者:
Brès, V;Tagami, H;Kiernan, RE
通讯作者: Kiernan, RE
DOI: 10.1074/jbc.m101385200
发表时间: 2001-07-27
影响因子: 4.8
作者:
Col, E;Caron, C;Khochbin, S
通讯作者: Khochbin, S
DOI: 10.1016/j.immuni.2005.03.010
发表时间: 2005-05-01
期刊: IMMUNITY
影响因子: 32.4
作者:
Bennasser, Y;Le, SY;Jeang, KT
通讯作者: Jeang, KT