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They cause the chronic disease lymphocystis, which is non-fatal, but substantially reduces the commercial value of the infected fish. To date, four genotypes of LCDV (LCDV1\u20134) have been identified, all of which encode the viral homologue of B-cell lymphoma 2 (Bcl-2), a key inhibitor of apoptosis. In this study, we performed biochemical and structural analyses of LCDV2 Bcl-2. Binding assays revealed that LCDV2 Bcl-2 exhibits binding selectivity toward BH3 domain-containing zebrafish proteins. It interacted with zBaxA and zNoxa, but not with zBaxB, zBid, or zBeclin 1, distinguishing it from mammalian and herpesviral Bcl-2 proteins. Subsequent structural determination of LCDV2 Bcl-2 in complex with the BH3 domain of zBaxA demonstrated that they interact in a canonical manner, primarily mediated by the BH3 consensus motif residues of zBaxA. 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