HIV-1 TAT Clade-C protein.HIV-1 TAT Recombinant-produced in E.coli is a single, non-glycosylated, polypeptide chain containing 100amino acids encoded by two exons and having a molecular mass of 21 kDa.Recombinant HIV-1 TAT is purified by proprietary chromatographic technique.HIV belongs to the retrovirus family, distinguished by possession of a viral reverse transcriptase that transcribes viral RNA into DNA which is integrated into the host-cellgenome.HIV-1 regulatory Trans-Acting Transcription factor (TAT)plays an essential role in viral replication and infectivity.In addition, during acute infection, TAT is released extracellularly by infected cells and is taken up by neighboringcells where it transactivates viral replication and increasesvirus infectivity.HIV-1 Tat activates transcription of HIV-1 viral genes by inducing phosphorylation of the C-terminaldomain(CTD) of RNA polymerase II.Tat can also disturbcellular metabolism by inhibiting proliferation of antigenspecific T lymphocytes and by inducing cellular apoptosis.