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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

A baculovirus anti-apoptosis gene homolog of the Trichoplusia ni granulovirus.

An inhibitor of apoptosis ( iap) gene homolog (Tn- iap) of the Trichoplusia ni granulovirus (TnGV) was cloned, sequenced and mapped on the genome of TnGV. Tn-iap encoded a protein (Tn-IAP) of 301 amino acids with a predicted molecular mass of 35 kDa. The Tn-IAP contained the two sequence motifs, BIRs and RING finger, characteristic of IAP proteins, and shared identities of 21-27% and similarities of 28-53% with IAP proteins of Cydia pomonella GV (Cp-IAP), Orgyia pseudotsugata multinucleocapsid nucleopolyhedrovirus (MNPV) (Op-IAP1, 3), Autographa californica MNPV (Ac-IAP1), Bombyx mori NPV (Bm-IAP1), Lymantria dispar MNPV (Ld-IAP3) and Buzura suppressaria single nucleocapsid NPV (Bs-IAP1). However, Tn-IAP shared no significant homology with baculovirus IAP2 proteins. Using an antisense Tn- iap probe, two major transcripts of approximately 800 nt and 1600 nt were detected by Northern blot analysis of RNA extracted from the fat body of T. ni larvae infected with the TnGV. Unlike Cp-IAP and Op-IAP3, however, Tn-IAP did not rescue virion occlusion in SF21 cells infected with a p35-deficient AcMNPV mutant. Tn-IAP's synthesis in vivo but failure to rescue p35-deficient AcMNPV in SF21 cells suggests it is a functional IAP that is only effective in certain cell types.[1]


  1. A baculovirus anti-apoptosis gene homolog of the Trichoplusia ni granulovirus. Bideshi, D.K., Anwar, A.T., Federici, B.A. Virus Genes (1999) [Pubmed]
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