Inhibition of human immunodeficiency virus type 1 wild-type and mutant reverse transcriptases by the phenyl ethyl thiazolyl thiourea derivatives trovirdine and MSC-127.
A new class of very potent and selective non-nucleoside inhibitors of HIV reverse transcriptase (RT) has recently been identified. The prototype compound trovirdine (LY 300046 HCl) and one analogue, MSC-127, have been studied with respect to inhibition of wild-type HIV-1 RT and RT with various mutations known to give rise to resistance to other non-nucleoside RT inhibitors, namely Leu100-->Ile (Ile100), Glu138-->Arg (Arg138), Tyr181-->Cys (Cys181) and Tyr188-->His (His188). The inhibition of HIV-1 RT by trovirdine and MSC-127 was reversible and template dependent. Trovirdine inhibited HIV-1 RT with an IC50 of 0.007 microM when employing heteropolymeric primer/template (oligo-DNA/ribosomal RNA) and dGTP as substrate. Enzyme kinetic studies showed that inhibition of RT by trovirdine was non-competitive with regard to deoxynucleoside triphosphates and uncompetitive with respect to varied primer/template under steady-state conditions. The amino acid changes Leu100, Tyr181 and Tyr188 gave rise to 25-, 147- and 12-fold decrease in inhibition by trovirdine. Enzyme-kinetic studies on trovirdine have been carried out using various RT mutants and compared to the properties of the earlier reported non-nucleoside RT inhibitors 9-Cl-TIBO, nevirapine and L-697,661.
Zhang
H
H
Medivir AB, Huddinge, Sweden.
Vrang
L
L
Bäckbro
K
K
Lind
P
P
Sahlberg
C
C
Unge
T
T
Oberg
B
B
D000998:Antiviral Agents / Q000494:pharmacology*; D001483:Base Sequence; D004789:Enzyme Activation; D054303:HIV Reverse Transcriptase; D015497:HIV-1 / Q000201:enzymology*; D007700:Kinetics; D008969:Molecular Sequence Data; D009154:Mutation; D011725:Pyridines / Q000494:pharmacology*; D012194:RNA-Directed DNA Polymerase / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism; D018894:Reverse Transcriptase Inhibitors / Q000494:pharmacology; D013890:Thiourea / Q000031:analogs & derivatives* / Q000494:pharmacology
D000998:Antiviral Agents; C098935:MSC 127; D011725:Pyridines; D018894:Reverse Transcriptase Inhibitors; D054303:HIV Reverse Transcriptase; D012194:RNA-Directed DNA Polymerase; D013890:Thiourea; C095511:trovirdine