Sirawat Srichatrapimuk. Initial characterization of the HIV-1 Uncoating factor and its role in certain early postentry tropisms. Doctoral Degree(Medical Microbiology ). Mahidol University. : Mahidol University, 2008.
Initial characterization of the HIV-1 Uncoating factor and its role in certain early postentry tropisms
การศึกษาคุณสมบัติเบื้องต้นของปัจจัยที่จำเป็นต่อกระบวนการ Uncoating ของเชื้อเอชไอวี-1 และบทบาทของปัจจัยนั้นต่อ early postentry tropism ในเซลล์บางชนิด
Abstract:
Uncoating is an essential step in the HIV-1 replication cycle. However, the
mechanism of this process remains unknown. In this work, HIV-1 uncoating was
studied in an in vitro model, with a focus on the characteristics of the cellular
uncoating factor. It was found that the HIV-1 uncoating factors were widely expressed
in various human cell types and functioned less efficiently below 37° C. These factors
were heat-sensitive and did not possess protease activity. ATP hydrolysis was not
necessary for the function of these factors. There were at least eight putative uncoating
factors in T lymphocyte cell lines. Based on a chromatographic technique, the
molecular sizes of these factors were predicted to be approximately 60 kDa and 160
kDa. HIV-1 is known to encounter early postentry blocks in the absence of cyclophilin
A-capsid interaction and in freshly isolated blood monocytes. Investigation of these
blocks revealed that the HIV uncoating in vitro occurred normally in these conditions,
indicating that the blocks are not a consequence of uncoating defect. Further studies of
the mechanism of HIV-1 uncoating may reveal new targets for antiretroviral
interventions.