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2 results for “HIV-1 budding”
Datasets for: The HIV-1 viral protease is activated during assembly and budding prior to particle release
<p>HIV-1 encodes a viral protease that is essential for the maturation of infectious viral particles. While protease inhibitors are effective antiretroviral agents, recent studies have shown that prematurely activating – rather than inhibiting – protease function leads to the pyroptotic death of infected cells, with exciting implications for efforts to eradicate viral reservoirs. Despite 40 years of research into the kinetics of protease activation, it remains unclear exactly when protease becomes activated. Recent reports have estimated that protease activation occurs minutes to hours after viral release, suggesting that premature protease activation may be challenging to induce efficiently. Here, combining a powerful FRET-based assay to monitor viral protease activity with sensitive techniques including nanoscale flow cytometry and instant structured illumination microscopy, we demonstrate that the viral protease is activated within cells prior to the release of free virions. Using genetic mutants that lock protease into a 'precursor' conformation, we further show that both the precursor and mature protease have rapid activation kinetics and that the activity of the precursor protease is sufficient for viral fusion with target cells. Our finding that HIV-1 protease is activated within producer cells prior to release of free virions helps resolve a long-standing question of when protease is activated and suggests that only a modest acceleration of protease activation kinetics may be required to induce potent and specific elimination of HIV-infected cells.</p>
Datasets for: The HIV-1 viral protease is activated during assembly and budding prior to particle release
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