The flaviviral methyltransferase is a substrate of Casein Kinase 1.

The flaviviral methyltransferase is a substrate of Casein Kinase 1.
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DOI:
10.1016/j.virusres.2009.01.002
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发表时间:
2009-04
期刊:
影响因子:
5
通讯作者:
Striker, Rob
Striker, Rob
中科院分区:
医学3区
文献类型:
--
作者:
Bhattacharya, Dipankar;Ansari, Israrul H.;Striker, Rob

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非结构蛋白5(NS5)的丝氨酸/苏氨酸磷酸化是黄病毒的一个保守特征,但负责的蛋白激酶(S)的身份和功能(S)尚不清楚。NS5甲基转移酶结构域中的丝氨酸56可以在细胞内被磷酸化,在所有黄病毒中都是保守的,是催化机制中的关键残基。该残基上的负电荷使2‘-0甲基转移酶活性失活,这是形成病毒RNA 5’帽结构所必需的。在这里,我们显示了酪蛋白激酶1(CK1)的药物抑制黄热病病毒(YFV)的产生。我们还证明了酪蛋白激酶1的α亚型(CK1α),一种先前被认为是磷酸化丙型肝炎病毒NS5A蛋白的激酶,也可以磷酸化YFV甲基转移酶的丝氨酸56。总体而言,这些结果表明CK1的活性可以影响黄病毒的复制。
Serine/Threonine phosphorylation of the nonstructural protein 5 (NS5) is a conserved feature of flaviviruses, but the identity and function(s) of the responsible kinase(s) remain unknown. Serine 56 in the methyltransferase domain of NS5 can be phosphorylated intracellularly, is conserved in all flaviviruses, and is a critical residue in the catalytic mechanism. A negative charge at this residue inactives the 2′-0 methyltransferase activity necessary to form a 5′ cap structure of the viral RNA. Here we show pharmacologic inhibition of Casein Kinase 1 (CK1) suppresses yellow fever virus (YFV) production. We also demonstrate the alpha isoform of Casein Kinase 1 (CK1α), a kinase previously identified as phosphorylating Hepatitis C Virus NS5A protein, also phosphorylates serine 56 of YFV methyltransferase. Overall these results suggest CK1 activity can influence flaviviral replication.
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