Integrase – Enzyme, Function and HIV Therapy
Integrase is a viral enzyme that allows HIV to insert its genetic material into the DNA of human cells. It is a key target of modern HIV treatments.
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Integrase is a viral enzyme that allows HIV to insert its genetic material into the DNA of human cells. It is a key target of modern HIV treatments.
What is Integrase?
Integrase is an enzyme produced by certain viruses – most notably the human immunodeficiency virus (HIV). Its primary function is to insert viral DNA into the chromosomal DNA of an infected human cell, a step that is essential for the virus to replicate and persist in the body.
Mechanism of Action
After HIV enters a human cell, it undergoes several steps before it can replicate:
- The viral RNA is first converted into DNA by another enzyme called reverse transcriptase.
- Integrase then cleaves specific sequences at the ends of the viral DNA in a step called 3'-processing.
- In the next step, known as strand transfer, integrase catalyzes the insertion of the processed viral DNA into the host cell's chromosomal DNA.
- The integrated viral DNA is referred to as the provirus and remains permanently within the genome of the infected cell.
The provirus serves as a permanent template for producing new viral particles and cannot easily be recognized or eliminated by the immune system.
Medical Significance
Because integrase is a viral enzyme with no equivalent in human cells, it represents an ideal target for antiviral drugs. Compounds that specifically block integrase are known as integrase inhibitors or integrase strand transfer inhibitors (INSTIs).
Integrase Inhibitors in HIV Therapy
Integrase inhibitors are now among the most widely used drugs in antiretroviral therapy (ART) for HIV. They block the strand transfer step, preventing viral DNA from being incorporated into the host genome. Well-known agents in this drug class include:
- Raltegravir – the first approved integrase inhibitor
- Elvitegravir – commonly used in combination formulations
- Dolutegravir – widely used due to its high efficacy and favorable tolerability
- Bictegravir – a newer agent with a long half-life
- Cabotegravir – also available as a long-acting injectable formulation
Resistance
As with other antiretroviral agents, HIV can develop resistance to integrase inhibitors through mutations in the viral integrase gene that reduce the binding affinity of the drug to the enzyme. However, newer second-generation agents such as dolutegravir and bictegravir have a significantly higher genetic barrier to resistance, making them much harder for the virus to overcome through mutation.
Integrase in Other Viruses
Integrase-like enzymes are not unique to HIV – they are also found in other retroviruses and in mobile genetic elements known as transposons. Research into these enzymes continues to provide valuable insights for the development of new antiviral therapies and for understanding the evolution of genomes.
References
- World Health Organization (WHO): Consolidated Guidelines on HIV Prevention, Testing, Treatment, Service Delivery and Monitoring (2021). Available at: https://www.who.int
- Engelman AN, Cherepanov P. The structural basis of HIV-1 DNA integration. Nature Reviews Microbiology, 2012; 10(4): 279-290. doi:10.1038/nrmicro2747
- European AIDS Clinical Society (EACS): EACS Guidelines Version 12.0 (2023). Available at: https://www.eacsociety.org
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