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The function of the African swine fever virus (ASFV)bcl-2homologue, geneA179L,in the regulation of apoptosis was investigated using as a model system the human myeloid leukemia cell line K562 induced to die by apoptosis with inhibitors of macromolecular synthesis, a process that is prevented by overexpression of humanbcl-2.It is shown that transfection of K562 cells with the ASFVA179Lgene protects these cells from apoptotic cell death induced by a combination of cycloheximide and actinomycin D or by treatment with cytosine arabinoside. To test the functional role of the highly conserved BH1 domain present in the A179L protein, the Gly residue at position 85 was mutated to Ala, since it has been shown that substitution of the corresponding Gly in human Bcl-2 abrogates its death-repressor activity. It was found that the Gly-to-Ala mutation in the BH1 domain of the viral protein abolished its capacity to protect …