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Adenovirus E1B 19 kDa and Bcl-2 proteins interact with a common set of cellular proteins.

Authors:
Boyd JM, Malstrom S, Subramanian T, Venkatesh LK, Schaeper U, Elangovan B, D'Sa-Eipper C, Chinnadurai G
Affiliation:
Journal:
Cell

Abstract

Adenovirus E1B 19 kDa protein protects against cell death induced by viral infection and certain external stimuli. The Bcl-2 protein can functionally substitute for the E1B 19 kDa protein. To identify cellular targets for the 19 kDa protein, we used the two-hybrid screen in yeast. We have isolated cDNAs for three different proteins, designated Nip1, Nip2, and Nip3, that interact with the 19 kDa protein. Mutational analysis indicates that these proteins do not associate with 19 kDa mutants defective in suppression of cell death, suggesting a correlation between interaction of these proteins and suppression of cell death. These proteins also associate with discrete sequence motifs in the Bcl-2 protein that are homologous to motifs of the 19 kDa protein. Our results suggest that two diverse proteins, the E1B 19 kDa and the Bcl-2 proteins, promote cell survival through interaction with a common set of cellular proteins.

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