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논문 기본 정보

자료유형
학술저널
저자정보
Kim, Yonggyun (School of Bioresource Sciences, College of Natural Sciences, Andong National University) Bruce A. Webb (Department of Entomology, University of Kentucky)
저널정보
한국응용곤충학회 Journal of Asia-Pacific Entomology Journal of asia-pacific entomology 제6권 제2호
발행연도
2003.1
수록면
243 - 246 (4page)

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An endoparasitic wasp, Campoletis sonorensis, is associated with a polydnavirus that protects the host wasp from the cellular immune defenses of its lepidopteran hosts. This virus, the Campoletis sonorensis ichnovirus (CsIV), also delays development of the parasitized host by inhibiting the synthesis of several proteins associated with development. VHv1.4, a cysteine-motif protein encoded in the CsIV genome, is expressed in parasitized host tissues and secreted into the plasma. VHv1.4 is abundantly expressed during parasitization, suggesting that it may playa critical role for a successful parasitization of C. sonorensis. This study tests a possibility that VHv1.4 inhibits the expression of an immune-related gene, lysozyme, of Heliothis virescens at the translation level because earlier studies showed that bacterial immune challenge increases lysozyme transcription, but this was not accompanied by a corresponding increase in enzyme activity in parasitized larvae. The lysozyme gene including open reading frame (ORF) plus both 3' and 5' untranslated regions (UTRs) was cloned from the fat body-originated cDNA of H. virescens and transcribed in vitro. The in vitro transcription product ($\approx$1 Kb) was translated in vitro using the rabbit reticulocyte lysate system and $\approx$ 16 kDa lysozyme protein was synthesized. VHv1.4 ($2\mu\textrm{M}$) did not inhibit the translation of the lysozyme mRNA. This study suggests that lysozyme is not the direct target of VHv1.4 action although its activity may be inhibited indirectly by other parasitization factors.

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