Mechanism of inhibition of HIV-1 reverse transcriptase by non-nucleoside inhibitors.
The structure of unliganded HIV-1 reverse transcriptase has been determined at 2.35 A resolution and refined to an R-factor of 0.219 (for all data) with good stereochemistry. The unliganded structure was produced by soaking out a weak binding non-nucleoside inhibitor, HEPT, from pregrown crystals. Comparison with the structures of four different RT and non-nucleoside inhibitor complexes reveals that only minor domain rearrangements occur, but there is a significant repositioning of a three-stranded beta-sheet in the p66 subunit (containing the catalytic aspartic acid residues 110, 185 and 186) with respect to the rest of the polymerase site. This suggests that NNIs inhibit RT by locking the polymerase active site in an inactive conformation, reminiscent of the conformation observed in the inactive p51 subunit.
Esnouf
R
R
Laboratory of Molecular Biophysics, Oxford, UK.
Ren
J
J
Ross
C
C
Jones
Y
Y
Stammers
D
D
Stuart
D
D
D000998:Antiviral Agents / Q000737:chemistry / Q000494:pharmacology*; D001665:Binding Sites; D018360:Crystallography, X-Ray; D054303:HIV Reverse Transcriptase; D015497:HIV-1 / Q000187:drug effects / Q000201:enzymology; D008958:Models, Molecular; D011487:Protein Conformation; D017433:Protein Structure, Secondary; D012194:RNA-Directed DNA Polymerase / Q000737:chemistry*; D018894:Reverse Transcriptase Inhibitors; D013941:Thymine / Q000031:analogs & derivatives* / Q000737:chemistry / Q000494:pharmacology
D000998:Antiviral Agents; D018894:Reverse Transcriptase Inhibitors; C061818:1-((2-hydroxyethoxy)methyl)-6-(phenylthio)thymine; D054303:HIV Reverse Transcriptase; D012194:RNA-Directed DNA Polymerase; D013941:Thymine