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.
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DOI:
10.1016/j.chom.2010.02.005
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发表时间:
2010-03-18
影响因子:
30.3
通讯作者:
Ott M
中科院分区:
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
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.
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影响因子:
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