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        Functional Analysis of the Inhibitor of Apoptosis Genes in Antheraea pernyi Nucleopolyhedrovirus

        Feng Yan,Xiaobei Deng,Junpeng Yan,Jiancheng Wang,Lunguang Yao,Songya lv,Yipeng Qi,Hua Xu 한국미생물학회 2010 The journal of microbiology Vol.48 No.2

        The inhibitor of apoptosis proteins (IAP) plays an important role in cell apoptosis. We cloned two novel IAP family members, Ap-iap1 and Ap-iap2, from Antheraea pernyi nucleopolyhedrovirus (ApNPV) genome. Ap-IAP1 contains two baculoviral IAP repeat (BIR) domains followed by a RING domain, but Ap-IAP2 has only one BIR domain and RING. The result of transient expression in Spodoptera frugiperda (Sf21) showed that Ap-iap1 blocked cell apoptosis induced by actinomycin D treatment and also rescued the p35 deficient Autographa californica nucleopolyhedrovirus (AcNPV) to replicate in Sf9 cells, while Ap-iap2 does not have this function. Several Ap-IAP1 truncations were constructed to test the activity of BIRs or RING motif to inhibit cell apoptosis. The results indicated that BIRs or RING of Ap-IAP1 had equally function to inhibit cell apoptosis. Therefore deletion of above both of the above domains could not block apoptosis induced by actinomycin D or rescue the replication of AcMNPV△p35. We also screened two phage-display peptides that might interact with Ap-IAP1.

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