JC virus agnoprotein enhances large T antigen binding to the origin of viral DNA replication: evidence for its involvement in viral DNA replication.

JC virus agnoprotein enhances large T antigen binding to the origin of viral DNA replication: evidence for its involvement in viral DNA replication.
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DOI:
10.1016/j.virol.2012.06.017
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发表时间:
2012-11-10
期刊:
影响因子:
3.7
通讯作者:
Safak M
Safak M
中科院分区:
医学3区
文献类型:
--
作者:
Saribas AS;White MK;Safak M

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Agnoprotein是JC病毒(JCV)生命周期成功完成所必需的,并且先前显示与JCV大T抗原(LT-Ag)相互作用。在这里,我们进一步描述了未知蛋白参与病毒DNA复制的特征。Agnoprotein增强LT-Ag与病毒来源(Ori)的DNA结合活性,而不直接与DNA相互作用。预测的两亲性α-螺旋的未知蛋白在这种增强中起着重要作用。未知蛋白的所有三个苯丙氨酸(Phe)残基都定位于该α-螺旋,并且已知Phe残基通常在蛋白质-蛋白质相互作用、蛋白质折叠和稳定性中起关键作用。通过诱变研究所有Phe残基的功能相关性。当全部突变为丙氨酸(Ala)时,突变病毒(F31 AF 35 AF 39 A)的复制效率显著低于单独的每个Phe突变病毒,表明Phe残基对未知蛋白功能的重要性。总的来说,这些研究表明,在病毒DNA复制的一个密切参与的未知蛋白。
Agnoprotein is required for the successful completion of the JC virus (JCV) life cycle and was previously shown to interact with JCV large T-antigen (LT-Ag). Here, we further characterized agnoprotein’s involvement in viral DNA replication. Agnoprotein enhances the DNA binding activity of LT-Ag to the viral origin (Ori) without directly interacting with DNA. The predicted amphipathic α-helix of agnoprotein plays a major role in this enhancement. All three phenylalanine (Phe) residues of agnoprotein localize to this α-helix and Phe residues in general are known to play critical roles in protein-protein interaction, protein folding and stability. The functional relevance of all Phe residues was investigated by mutagenesis. When all were mutated to alanine (Ala), the mutant virus (F31AF35AF39A) replicated significantly less efficiently than each individual Phe mutant virus alone, indicating the importance of Phe residues for agnoprotein function. Collectively, these studies indicate a close involvement of agnoprotein in viral DNA replication.
DOI: 10.1016/0168-1702(92)90136-w
发表时间: 1992-09-15
期刊: VIRUS RESEARCH
影响因子: 5
作者:
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通讯作者: FRISQUE, RJ
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发表时间: 1982-01-01
影响因子: 5.4
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发表时间: 1984-01-01
影响因子: 5.4
作者:
FRISQUE, RJ;BREAM, GL;CANNELLA, MT
通讯作者: CANNELLA, MT