Apoptosis regulatory protein Siva is a protein that in humans is encoded by the SIVA1gene.[5][6]
This gene encodes a protein with an important role in the apoptotic (programmed cell death) pathway induced by the CD27 antigen, a member of the tumor necrosis factor receptor (TFNR) superfamily. The CD27 antigen cytoplasmic tail binds to the N-terminus of this protein. Two alternatively spliced transcript variants encoding distinct proteins have been described.[6]
Siva protein is a zinc-containing intracellular ligand of the CD4 receptor that promotes HIV-1 envelope-induced apoptosis in T-lymphoid cells. Recent research has demonstrated that Siva is a direct transcriptional target for the tumor-suppressors p53 and E2F1. [7]
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