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Human endogenous retrovirus K endopeptidase (EC 3.4.23.50, human endogenous retrovirus K10 endopeptidase, endogenous retrovirus HERV-K10 putative protease, human endogenous retrovirus K retropepsin, HERV K10 endopeptidase, HERV K10 retropepsin, HERV-K PR, HERV-K protease, HERV-K113 protease, human endogenous retrovirus K113 protease, human retrovirus K10 retropepsin) is an enzyme derived from ...
Retroviral integrase (IN) is an enzyme produced by a retrovirus (such as HIV) that integrates (forms covalent links between) its genetic information into that of the host cell it infects. [1] Retroviral INs are not to be confused with phage integrases ( recombinases ) used in biotechnology , such as λ phage integrase, as discussed in site ...
EVEs that originate from the integration of retroviruses are known as endogenous retroviruses, or ERVs, [4] and most viral fossils are ERVs. They may preserve genetic code from millions of years ago, hence the "fossil" terminology, although no one has detected a virus in mineral fossils . [ 2 ]
A retrovirus is a type of virus that inserts a DNA copy of its RNA genome into the DNA of a host cell that it invades, thus changing the genome of that cell. [2] After invading a host cell's cytoplasm, the virus uses its own reverse transcriptase enzyme to produce DNA from its RNA genome, the reverse of the usual pattern, thus retro (backward).
The replication cycle of a retrovirus entails the insertion ("integration") of a DNA copy of the viral genome into the nuclear genome of the host cell.Most retroviruses infect somatic cells, but occasional infection of germline cells (cells that produce eggs and sperm) can also occur.
It was found that without rev expression, there was a marked increase in nuclear env RNA, which suggests that rev plays an important role in the nuclear export of env mRNA. [10] The role of rev was further elucidated when it was found that rev acts in trans to target a specific sequence present in the env gene of HIV-1 to initiate export of ...
Env genes are found in LTR retrotransposon types Ty1-copia (Pseudoviridae), Ty3-gypsy (Metaviridae) and BEL/Pao. [9] [8] They encode glycoproteins on the retrovirus envelope needed for entry into the host cell. Retroviruses can move between cells whereas LTR retrotransposons can only move themselves into the genome of the same cell. [10]
One of the first polypeptides to be translated destroys the host's DNA. In retroviruses (which inject an RNA strand), the enzyme reverse transcriptase transcribes the viral RNA into DNA, which is then transcribed again into RNA. Once the viral DNA has taken control it induces the host cell's machinery to synthesize viral DNA and proteins and ...