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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.
The rev response element (RRE) is a 240 base-pair sequence located in the second intron of the HIV-1 genome, immediately downstream of the env gene. [18] The RRE remains functional if translocated, but needs to remain in the same orientation (cannot be inverted). The RRE is retained by incompletely processed mRNA transcripts.
A 3D representation that includes the retroviral psi packaging element. This is a solution RNA structure model of the HIV-1 dimerization initiation site in the kissing-loop dimer. [7] In HIV, the psi element is around 80–150 nucleotides in length, and located at the 5' end of the genome just upstream of the gag initiation codon. [8]
The HIV-1 Rev response element (RRE) is a highly structured, ~350 nucleotide RNA segment present in the Env coding region of unspliced and partially spliced viral mRNAs.In the presence of the HIV-1 accessory protein Rev, HIV-1 mRNAs that contain the RRE can be exported from the nucleus to the cytoplasm for downstream events such as translation and virion packaging.
Identical LTR sequences at either end of a retrotransposon. A long terminal repeat (LTR) is a pair of identical sequences of DNA, several hundred base pairs long, which occur in eukaryotic genomes on either end of a series of genes or pseudogenes that form a retrotransposon or an endogenous retrovirus or a retroviral provirus.
Dual-tropic HIV-1 strains are thought to be transitional strains of HIV-1 and thus are able to use both CCR5 and CXCR4 as co-receptors for viral entry. The α-chemokine SDF-1, a ligand for CXCR4, suppresses replication of T-tropic HIV-1 isolates. It does this by down-regulating the expression of CXCR4 on the surface of HIV target cells. M ...
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