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Molecular analysis of an enhancin gene in the Lymantria dispar nuclear polyhedrosis virus.

机译:舞毒蛾核型多角体病毒中enhancin基因的分子分析。

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摘要

A Lymantria dispar nuclear polyhedrosis virus (LdMNPV) gene has been identified that encodes a homolog to the granulovirus (GV) enhancin proteins that are capable of enhancing the infection of other baculoviruses. Enhancin genes have been identified and sequenced for three species of GVs but have not been found in any other nuclear polyhedrosis virus to date. The LdMNPV enhancin gene is located between 67.6 and 70.1 kbp on the viral genome. Northern and primer extension analyses of viral RNAs indicate that the enhancin gene transcripts are expressed at late times postinfection from a consensus baculovirus late promoter. The LdMNPV enhancin exhibits 29% amino acid identity to the enhancin proteins of the Trichoplusia ni, Pseudaletia unipuncta, and Helicoverpa armigera GVs. All four proteins contain a conserved zinc-binding domain characteristic of metalloproteases. A recombinant virus (enhancin::cat) was constructed in which the LdMNPV enhancin gene was inactivated by insertion mutagenesis in order to ascertain the effect of the enhancin protein on viral potency. The bioassay results indicate that disruption of the enhancin gene in the LdMNPV results in a reduction in viral potency.
机译:已经确定了一种蔓延天牛核多角体病毒(LdMNPV)基因,该基因编码与粒状病毒(GV)增强蛋白的同源物,该蛋白能够增强其他杆状病毒的感染。已经为三种GV鉴定了Enhancin基因并对其进行了测序,但是迄今为止在任何其他核多角体病毒中都没有发现。 LdMNPV enhancin基因位于病毒基因组的67.6至70.1 kbp之间。病毒RNA的Northern和引物延伸分析表明,enhancin基因转录物在感染后从共有杆状病毒晚期启动子表达。 LdMNPV enhancin与Trichoplusia ni,Pseudaletia unipuncta和Helicoverpa armigera GVs的enhancin蛋白具有29%的氨基酸同一性。所有四种蛋白质均含有金属蛋白酶的保守锌结合结构域。构建了重组病毒(enhancin :: cat),其中通过插入诱变使LdMNPV enhancin基因失活,以确定enhancin蛋白对病毒效力的影响。生物测定结果表明,LdMNPV中enhancin基因的破坏导致病毒效力降低。

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