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The genome and proteins of HIV (human immunodeficiency virus) have been the subject of extensive research since the discovery of the virus in 1983. [1] [2] "In the search for the causative agent, it was initially believed that the virus was a form of the Human T-cell leukemia virus (HTLV), which was known at the time to affect the human immune system and cause certain leukemias.
Structure of the RNA genome of HIV-1. The RNA genome consists of at least seven structural landmarks (LTR, TAR, RRE, PE, SLIP, CRS, and INS), and nine genes (gag, pol, and env, tat, rev, nef, vif, vpr, vpu, and sometimes a tenth tev, which is a fusion of tat, env and rev), encoding 19 proteins.
The HIV trans-activation response (TAR) element is an RNA element which is known to be required for the trans-activation of the viral promoter and for virus replication. The TAR hairpin is a dynamic structure [1] that acts as a binding site for the Tat protein, and this interaction stimulates the activity of the long terminal repeat promoter.
Diagram of an HIV virion structure Scanning electron micrograph of HIV-1, colored green, budding from a cultured lymphocyte HIV is the cause of the spectrum of disease known as HIV/AIDS. HIV is a retrovirus that primarily infects components of the human immune system such as CD4 + T cells, macrophages and dendritic cells .
Diagram of HIV virion. The env gene codes for the gp160 protein which forms a homotrimer, and is cleaved into gp120 and gp41 by the host cell protease, furin. To form an active fusion protein, SU gp120 and TM gp41 polypeptides remain non-covalently bound together, but this interaction is often not stable, leading to shed, soluble gp120 and ...
Like other lentiviruses, HIV-1 encodes a trans-activating regulatory protein (Tat), which is essential for efficient transcription of the viral genome. [7] [8] Tat acts by binding to an RNA stem-loop structure, the trans-activation response element (TAR), found at the 5′ ends of nascent HIV-1 transcripts.
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