Sequence-function analysis of the Sendai virus L protein domain VI.

Sequence-function analysis of the Sendai virus L protein domain VI.
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DOI:
10.1016/j.virol.2010.06.019
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发表时间:
2010-09-30
期刊:
影响因子:
3.7
通讯作者:
Grdzelishvili VZ
Grdzelishvili VZ
中科院分区:
医学3区
文献类型:
--
作者:
Murphy AM;Moerdyk-Schauwecker M;Mushegian A;Grdzelishvili VZ

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非节段性负链病毒L聚合酶蛋白(约2200个氨基酸)含有6个保守的序列区域(“结构域”),它们参与了病毒基因的合成、5‘端封端、封端甲基化、3’端多聚腺苷化和基因组核糖核酸的复制。以前对水疱性口炎病毒的研究发现,L蛋白结构域VI中的氨基酸残基是mRNA帽甲基化所必需的。在我们最近的研究中,我们分析了仙台病毒L蛋白第六结构域中的四个氨基酸残基,我们的数据表明,L蛋白对帽甲基化的要求在横纹夜蛾病毒和副粘病毒这两个不同的家族中可能存在差异。在本研究中,我们针对SeV L蛋白结构域VI进行了更全面的突变分析,创建了24个L突变株,并测试了这些突变对病毒基因合成、帽甲基化、病毒基因组复制和病毒生长动力学的影响。我们的分析确定了成功的帽甲基化和病毒复制所需的几个残基,并清楚地表明了K-D-K-E四个基序和富含甘氨酸的基序在SeV帽甲基化中的重要性。本研究是首次对副粘病毒科L蛋白结构域VI进行了广泛的序列分析,证实了该结构域在单核病毒目不同家族中的结构和功能上的相似性。
The large (about 2200 amino acids) L polymerase protein of nonsegmented negative-strand RNA viruses (order Mononegavirales) has six conserved sequence regions (“domains”) postulated to constitute the specific enzymatic activities involved in viral mRNA synthesis, 5′-end capping, cap methylation, 3′ polyadenylation, and genomic RNA replication. Previous studies with vesicular stomatitis virus identified amino acid residues within the L protein domain VI required for mRNA cap methylation. In our recent study we analyzed four amino acid residues within domain VI of the Sendai virus L protein and our data indicated that there could be differences in L protein sequence requirements for cap methylation in two different families of Mononegavirales — rhabdoviruses and paramyxoviruses. In this study, we conducted a more comprehensive mutational analysis by targeting the entire SeV L protein domain VI, creating twenty-four L mutants, and testing these mutations for their effects on viral mRNA synthesis, cap methylation, viral genome replication and virus growth kinetics. Our analysis identified several residues required for successful cap methylation and virus replication and clearly showed the importance of the K-D-K-E tetrad and glycine-rich motif in the SeV cap methylation. This study is the first extensive sequence analysis of the L protein domain VI in the family Paramyxoviridae, and it confirms structural and functional similarity of this domain across different families of the order Mononegavirales.
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