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Structure-activity relationships in HIV-1 reverse transcriptase revealed by radiation target analysis.
Nicolas Sluis-Cremer1, Ellis Kempner, Michael A Parniak
1University of Pittsburgh, Department of Medicine, Pittsburgh, Pennsylvania 15261, USA.
Protein Science : a Publication of the Protein Society
|August 22, 2003
Summary
Radiation target analysis reveals HIV-1 reverse transcriptase (RT) functions as a dimer. DNA substrates promote p51 subunit homodimerization, suggesting broader applications for radiation inactivation studies in enzyme analysis.
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- Radiation target analysis is a method to determine macromolecular size and function.
- HIV-1 reverse transcriptase (RT) exists in different recombinant forms, including p66/p51 and p66/p66 dimers.
Purpose of the Study:
- To investigate structure-function relationships of recombinant HIV-1 RT using radiation target analysis.
- To determine the inactivation mechanisms of different HIV-1 RT forms and the role of DNA substrates.
Main Methods:
- Radiation inactivation analysis was employed to assess structural and functional target sizes.
- Studies were conducted on p66/p51 and p66/p66 dimeric forms, as well as isolated p51 subunits of HIV-1 RT.
- Analyses were performed both with and without DNA template/primer substrates.
Main Results:
- For p66/p51 and p66/p66 HIV-1 RT, target sizes indicated inactivation of both subunits upon ionization of one.
- Isolated p51 subunits inactivated as monomers.
- In the presence of DNA, p51 subunits showed a dimeric target size, suggesting substrate-induced homodimerization.
Conclusions:
- HIV-1 RT primarily functions as a dimer, with ionization affecting both subunits.
- DNA substrates can facilitate p51 homodimer formation.
- Radiation inactivation is a valuable tool for studying enzyme structure-function and determining the functional forms of enzymes like murine leukemia virus RT.