title: Characterization of a protein tyrosine phosphatase gene CvBV202 from Cotesia vestalis polydnavirus (CvBV).
abstract: Cotesia vestalis (Haliday) (Hymenoptera: Braconidae) is an endoparasitoid of the larval stage of the diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae) and injects a polydnavirus (CvBV) into its host during oviposition. In this paper we characterize CvBV202 and its product. CvBV202 is located on segment S2 of CvBV genome; it has a size of 984 bp and encodes a putative protein of 328 amino acids, including protein phosphatase domain and tyrosine-specific protein phosphatase domain. Gene transcripts were detected in extracts of the host as early as 2 h post-parasitization (p.p.) and continued to be detected for 6 days. Tissue-specific patterns of this gene expression showed that CvBV202 had a close relationship with the host's physiological alternations including immunosuppression, modulation of hormone titer, and nutrition metabolism. The protein was detected in the parasitized hosts at 12 h p.p. using western blot assay. The product of CvBV202 was found to be around 59 kDa, much larger than the predicted molecular weight of 37.8 kDa, suggesting that post-translational modification of CvBV202 occurs in host cells, corresponding with the existence of many post-translational modification sites. Immunofluorescence staining and confocal laser scanning microscopy revealed that CvBV202 and the fused protein eGFP-CvBV202 were observed both in the nuclear region and cytoplasm of the hemocytes of the naturally parasitized host larvae and rBac-eGFP-CvBV202-infected Tn-5B1-4 cells, respectively.
authors.affiliation: Institute of Insect Sciences, Zhejiang University, Hangzhou 310029, China.
authors.forename: Min
authors.initials: M
authors.lastname: Shi
authors.forename: Ya-Feng
authors.initials: YF
authors.lastname: Chen
authors.forename: Yuan
authors.initials: Y
authors.lastname: Yao
authors.forename: Fang
authors.initials: F
authors.lastname: Huang
authors.forename: Xue-Xin
authors.initials: XX
authors.lastname: Chen
mesh_terms: D000818:Animals; D002460:Cell Line; D001517:Coleoptera / Q000502:physiology / Q000821:virology; D015967:Gene Expression Regulation, Viral; D054884:Host-Pathogen Interactions; D007814:Larva / Q000502:physiology / Q000821:virology; D008969:Molecular Sequence Data; D009036:Moths / Q000502:physiology / Q000821:virology; D018071:Polydnaviridae / Q000737:chemistry / Q000201:enzymology* / Q000235:genetics; D017434:Protein Structure, Tertiary; D017027:Protein Tyrosine Phosphatases / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D014764:Viral Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism
chemical_list: D014764:Viral Proteins; D017027:Protein Tyrosine Phosphatases