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NRTIs (Nucleoside Reverse Transcriptase Inhibitors)

NRTIs, or nucleoside reverse transcriptase inhibitors, are a class of antiretroviral drugs used to treat HIV. They work by competitively inhibiting nucleotide binding to reverse transcriptase, and also terminate the elongating DNA chain. Certain drugs have specific indications; for example, ZDV is used for general prophylaxis and during pregnancy to decrease transmission. This drug class is notable because they must be "activated" in the cell, and require phosphorylation.
AIDS bandaid

NRTIs are indicated for treating HIV and target reverse transcriptase activity.

Pregnancy and Prophylaxis given ZDV
Pregnant-woman with Purple-axes and Zombie-dove

ZDV, or zidovudine, is a specific NRTI that is used to provide general prophylaxis as well as for pregnant women who are HIV positive to decrease the risk of fetal transmission.

Inhibit Nucleotide Binding to Reverse Transcriptase
Inhibiting-chains preventing Reversing Train-script from Binding to Nucleotides

NRTIs are a class of drug which work by competitively inhibiting nucleotide binding to reverse transcriptase. This prevents the virus from making a DNA copy of its RNA.

Chain Termination
Chain Stop

By binding to the viral reverse transcriptase, these medications lead to elongating DNA (which is viral) chain termination. A lack of a 3'-OH group in the incorporated nucleotide analogue prevents DNA chain elongation, and therefore, the viral DNA growth is terminated.

Require Phosphorylation
Using Phosphorus-P

NRTIs need to become "activated" and require phosphorylation from the host cell.

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