It does this by using an enzyme called reverse transcriptase.

HIV-1 RT does not have proof-reading activity.

Get kids back-to-school ready with Expedition: Learn! NNRTIs are therefore classified as Nucleoside analog reverse-transcriptase inhibitors (NARTIs or NRTIs) compose the first class of antiretroviral drugs developed. To spread, the virus needs to enter these cells and make copies of itself. If that person has taken antiretroviral drugs before, their healthcare provider will also factor this in when deciding on treatment options.Once HIV treatment starts, the medication needs to be taken on a daily basis exactly as instructed. Blocking reverse transcriptase and reverse transcription prevents HIV from replicating. Also important is L74, which interacts with the template strand to position it for base pairing with the nucleotide. All rights reserved. The first being reduced incorporation of the nucleotide analog into DNA over the normal nucleotide. Some side effects can be avoided or controlled.Anyone who experiences these severe side effects should contact their healthcare provider immediately to determine whether they should keep taking the medication. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox.



This, combined with selective pressure from the drug, leads to mutations in reverse transcriptase that make the virus less susceptible to NRTIs and NNRTIs. The healthcare provider may be able to change the combination of drugs to decrease side effects.The risk of side effects may be higher depending on a person’s medical history and lifestyle.



NNRTIs are not incorporated into the viral DNA like NRTIs, but instead inhibit the movement of protein domains of reverse transcriptase that are needed to carry out the process of DNA synthesis. Entry inhibitors include: CCR5 antagonist — maraviroc (Selzentry, Celsentri) Fusion inhibitor — enfuvirtide (T-20, Fuzeon) Reverse transcription.



Antiretroviral drugs interfere with the ability of a virus to multiply or reproduce. A prime example for this mechanism is the M184V mutation that confers resistance to lamivudine (3TC) and emtricitabine (FTC).The second mechanism is the excision or the hydrolytic removal of the incorporated drug or NNRTIs do not bind to the active site of the polymerase but in a less conserved pocket near the active site in the p66 subdomain.

Reverse transcriptase: discovery and impacts. …with an enzyme, called a reverse transcriptase, that copies the single-stranded RNA to form double-stranded DNA.… The ability of reverse transcriptase to synthesize DNA from RNA has been used in the laboratory. HIV uses reverse transcriptase to convert its genetic material (RNA) into DNA, which results viral DNA migrating into the nucleus of the cell. Blocking reverse transcriptase and reverse transcription prevents HIV from replicating. NNRTIs block reverse transcriptase by binding directly to the enzyme.


This class of drugs was first described at the Researchers have designed molecules which dually inhibit both reverse transcriptase (RT) and integrase (IN). This animation shows how a medication called AZT, which is a reverse transcriptase inhibitor, can be used to treat HIV/AIDS.

Some of the same compounds used as RTIs can also block HBV replication; when used in this way they are referred to as polymerase inhibitors.

For these important drugs, newer versions cause fewer severe side effects than previous versions, but some side effects may still occur for any of these medications.It’s important for people whose healthcare providers have prescribed NRTIs to stick to their treatment plan to manage HIV. Protease inhibitors are antiviral drugs. Reverse transcriptase first transcribes a complementary strand of DNA to make an RNA:DNA hybrid. Without reverse transcriptase, HIV can't make new virus copies of itself.

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