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Many species are infected by lentiviruses, which are characteristically responsible for long-duration illnesses with a long incubation period. Upon entry into the target cell, the viral RNA genome is converted reverse transcribed into double-stranded DNA by a virally encoded enzyme, reverse transcriptase , that is transported along with the viral genome in the virus particle. The resulting viral DNA is then imported into the cell nucleus and integrated into the cellular DNA by a virally encoded enzyme, integrase , and host co-factors. Alternatively, the integrated viral DNA may be transcribed , producing new RNA genomes and viral proteins, using host cell resources, that are packaged and released from the cell as new virus particles that will begin the replication cycle anew. Two types of HIV have been characterized: A matrix composed of the viral protein p17 surrounds the capsid ensuring the integrity of the virion particle.
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From: Akidal(24 videos) Added: 09.01.2019 Views: 495
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