Characterization of a human Bid homologue protein from Gallus gallus

Dı́az-Gil, Gema; Gómez-Esquer, Francisco; Agudo, David; Delcán, José; Martínez-Arribas, Fernando; Rivas, Carmen; Schneider, J.; Palomar, María Angustias; Linares, Rafael

doi:10.1016/j.gene.2005.12.011

Cited by 2 publications

(2 citation statements)

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“…Although this underscores the evolutionary relatedness of the apoptotic program, it is possible that FPV039 may exhibit slightly different binding profiles in avian cells. Unfortunately, only Bmf (33) and Bid (19) homologues have been characterized in chicken cells, and an incompletely annotated chicken genome coupled with a paucity of reagents have so far prevented a detailed examination of avian apoptosis.…”

Section: Discussionmentioning

confidence: 99%

The Fowlpox Virus BCL-2 Homologue, FPV039, Interacts with Activated Bax and a Discrete Subset of BH3-Only Proteins To Inhibit Apoptosis

Banadyga

Veugelers

Campbell

et al. 2009

J Virol

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Apoptosis is a potent immune barrier against viral infection, and many viruses, including poxviruses, encode proteins to overcome this defense. Interestingly, the avipoxviruses, which include fowlpox and canarypox virus, are the only poxviruses known to encode proteins with obvious Bcl-2 sequence homology. We previously characterized the fowlpox virus protein FPV039 as a Bcl-2-like antiapoptotic protein that inhibits apoptosis by interacting with and inactivating the proapoptotic cellular protein Bak. However, both Bak and Bax can independently trigger cell death. Thus, to effectively inhibit apoptosis, a number of viruses also inhibit Bax. Here we show that FPV039 inhibited apoptosis induced by Bax overexpression and prevented both the conformational activation of Bax and the subsequent formation of Bax oligomers at the mitochondria, two critical steps in the induction of apoptosis. Additionally, FPV039 interacted with activated Bax in the context of Bax overexpression and virus infection. Importantly, the ability of FPV039 to interact with active Bax and inhibit Bax activity was dependent on the structurally conserved BH3 domain of FPV039, even though this domain possesses little sequence homology to other BH3 domains. FPV039 also inhibited apoptosis induced by the BH3-only proteins, upstream activators of Bak and Bax, despite interacting detectably with only two: BimL and Bik. Collectively, our data suggest that FPV039 inhibits apoptosis by sequestering and inactivating multiple proapoptotic Bcl-2 proteins, including certain BH3-only proteins and both of the critical "gatekeepers" of apoptosis, Bak and Bax.

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