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Structural interactions between chemokine receptors, gp120 Env and CD4
1Division of Human Retrovirology, Dana-Farber Cancer Institute, Harvard School of Public Health, Boston, MA, 02115, USA.
Seminars in Immunology
|July 7, 1998
Summary
Chemokine receptors like CCR5 and CXCR4 are crucial co-receptors for HIV and SIV entry into cells. Understanding these seven transmembrane segment (7TMS) receptors aids in developing HIV entry inhibitors.
Area of Science:
- Virology
- Immunology
- Molecular Biology
Background:
- Seven transmembrane segment (7TMS) receptors, including CCR5 and CXCR4, are essential for HIV and SIV infection alongside CD4.
- CCR5 is the principal co-receptor for early and chronic HIV-1 infection, supporting most primary HIV-1 and SIV isolates.
Purpose of the Study:
- To elucidate the role of chemokine receptors as co-receptors in HIV and SIV entry.
- To identify the molecular determinants governing the interaction between viral envelope glycoproteins and chemokine receptors.
Main Methods:
- Analysis of mutated chemokine receptors to understand binding sites.
- Comparative studies of HIV, HIV-2, and SIV isolates to determine co-receptor usage.
Main Results:
- CCR5 is critical for most primary HIV-1 and SIV infections.
- Late-stage and adapted HIV/SIV strains utilize alternative 7TMS receptors, notably CXCR4.
- Specific, conformation-dependent sites on chemokine receptors mediate viral envelope binding.
Conclusions:
- Chemokine receptor specificity is a key factor in HIV and SIV entry mechanisms.
- Identifying these interaction sites is vital for designing effective HIV entry inhibitors.