Identification and functional analysis of LsMNPV anti-apoptosis genes.
Three anti-apoptosis genes, Ls-iap2, iap3 and p49 were found in Leucania separata multiple nuclear polyhedrovirus. Amino acid sequence homology of Ls-IAP2 and Ls-IAP3 with Op-IAP2 and Op-IAP3 from Orgyia pseddotsugata MNPV were 20% and 42%, while that of Ls-P49 is 28% with Sl-P49 from Spodoptera littorolis MNPV. Ls-IAP2 contains one baculoviral IAP repeat (BIR) domain followed by a RING domain, while Ls-IAP3 contains two BIRs and a RING. Ls-P49 contains a reactive site loop, predicted cleavage site (KKLD(74) downward arrow G) that is different from Sl-P49 (TVID(94) downward arrow G). Expressed Ls-iap3 or Ls-p49 under presence of actinomycin D in SF9 cells, DNA ladder assay revealed that Ls- IAP3 or Ls-P49 could block the apoptosis of SF9 cells induced by actinomycin D. Replication of p35 deficient-mutant Autographa californica MNPV in SF9 cells was also rescued when Ls-iap3 or Ls-p49 was expressed transiently. No anti-apoptotic activity was observed for Ls-IAP2. The results showed that both of Ls-IAP3 and Ls-P49 were functional apoptotic suppressors in SF9 cells.
Kim
Yu-Sin
YS
College of Life Scienc, KIM IL SUNG University, Pyongyang, D.P.R.K.
Xiao
Hua-Zhong
HZ
Du
En-Qi
EQ
Cai
Guo-Shuai
GS
Lu
Song-Ya
SY
Qi
Yi-Peng
YP
D000595:Amino Acid Sequence; D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D001483:Base Sequence; D002460:Cell Line; D053938:DNA Fragmentation / Q000187:drug effects; D003609:Dactinomycin / Q000494:pharmacology; D005434:Flow Cytometry; D051034:Inhibitor of Apoptosis Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D017924:Nucleopolyhedroviruses / Q000235:genetics* / Q000502:physiology; D016415:Sequence Alignment; D020539:Sequence Analysis, Protein; D018411:Spodoptera / Q000166:cytology / Q000187:drug effects; D014162:Transfection; D014764:Viral Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D014779:Virus Replication / Q000187:drug effects
D051034:Inhibitor of Apoptosis Proteins; D014764:Viral Proteins; D003609:Dactinomycin