Complementary assays reveal a relationship between HIV-1 uncoating and reverse transcription

AE Hulme, O Perez, TJ Hope - Proceedings of the National …, 2011 - National Acad Sciences
AE Hulme, O Perez, TJ Hope
Proceedings of the National Academy of Sciences, 2011National Acad Sciences
During the early stages of HIV-1 replication the conical capsid composed of p24CA protein
dissociates from the rest of the cytoplasmic viral complex by a process called uncoating.
Although proper uncoating is known to be required for HIV-1 infection, many questions
remain about the timing and factors involved in the process. Here we have used two
complementary assays to study the process of uncoating in HIV-1–infected cells, specifically
looking at the timing of uncoating and its relationship to reverse transcription. We developed …
During the early stages of HIV-1 replication the conical capsid composed of p24CA protein dissociates from the rest of the cytoplasmic viral complex by a process called uncoating. Although proper uncoating is known to be required for HIV-1 infection, many questions remain about the timing and factors involved in the process. Here we have used two complementary assays to study the process of uncoating in HIV-1–infected cells, specifically looking at the timing of uncoating and its relationship to reverse transcription. We developed a fluorescent microscopy-based uncoating assay that detects the association of p24CA with HIV-1 viral complexes in cells. We also used an owl monkey kidney (OMK) cell assay that is based on timed TRIM-CypA–mediated restriction of HIV-1 replication. Results from both assays indicate that uncoating is initiated within 1 h of viral fusion. In addition, treatment with the reverse transcriptase inhibitor nevirapine delayed uncoating in both assays. Analysis of reverse transcription products in OMK cells revealed that the generation of early reverse transcription products coincides with the timing of uncoating in these assays. Collectively, these results suggest that some aspect of reverse transcription has the ability to influence the kinetics of uncoating.
National Acad Sciences