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Assembly and Purification of Prototype Foamy Virus Intasomes
Published on: March 19, 2018
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Structural basis for strand-transfer inhibitor binding to HIV intasomes
Dario Oliveira Passos1, Min Li2, Ilona K Jóźwik1
1The Salk Institute for Biological Studies, Laboratory of Genetics, La Jolla, CA 92037, USA.
Science (New York, N.Y.)
|February 1, 2020
Summary
New cryo-EM structures reveal how HIV intasomes bind to integrase strand-transfer inhibitors (INSTIs). These findings explain INSTI efficacy against resistant HIV variants and inform future drug design for better treatments.
Area of Science:
- Structural Biology
- Virology
- Drug Discovery
Background:
- The human immunodeficiency virus (HIV) intasome is a crucial complex for viral DNA integration into host cells.
- Integrase strand-transfer inhibitors (INSTIs) are a key class of antiretroviral drugs targeting HIV replication.
- Previous biochemical challenges have limited high-resolution structural analysis of intasome-INSTI interactions.
Purpose of the Study:
- To determine high-resolution cryo-electron microscopy (cryo-EM) structures of HIV intasomes bound to modern INSTIs.
- To elucidate the structural basis of INSTI binding and mechanism of action.
- To understand how INSTIs overcome drug resistance in HIV variants.
Main Methods:
- High-resolution cryo-electron microscopy (cryo-EM) was employed.
- Structural analysis of HIV intasomes complexed with the latest generation of INSTIs.
- Biochemical and structural characterization of drug-target interactions.
Main Results:
- High-resolution cryo-EM structures of HIV intasomes with INSTIs were obtained.
- Detailed insights into the binding interactions within the integrase active site were revealed.
- Structural basis for the broad efficacy of a leading INSTI against resistant HIV variants was elucidated.
Conclusions:
- Small modifications in the integrase active site significantly impact INSTI binding and drug design.
- Structural data provide mechanistic understanding of INSTI effectiveness against resistant HIV strains.
- These findings will aid in the development of improved and next-generation antiretroviral therapies for HIV.
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