Telaprevir

Category	HCV Protease
CAS	402957-28-2
Description	Telaprevir is a potent, selective, peptidomimetic inhibitor of the hepatitis C virus (HCV) NS3-4A serine protease, and it demonstrated excellent antiviral activity both in genotype 1b HCV replicon cells (50% inhibitory concentration [IC50] = 354 nM) and in human fetal hepatocytes infected with genotype 1a HCV-positive patient sera (IC50 = 280 nM). Telaprevir forms a covalent but reversible complex with the genotype 1a HCV NS3-4A protease in a slow-on, slow-off process with a steady-state inhibition constant (K(i)*) of 7 nM. Dissociation of the covalent enzyme-inhibitor complex of Telaprevir and genotype 1a HCV protease has a half-life of almost an hour. A >4-log10 reduction in the HCV RNA levels was observed after a 2-week incubation of replicon cells with Telaprevir, with no rebound of viral RNA observed after withdrawal of the inhibitor. In several animal species, Telaprevir exhibits a favorable pharmacokinetic profile with high exposure in the liver. In a recently developed HCV protease mouse model, Telaprevir showed excellent inhibition of HCV NS3-4A protease activity in the liver.

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Product Information

Synonyms	Telavic; VRT 111950; VX 950; Incivek; Incivo; LY 570310; MP 424; S-Telaprevir; (1S,3aR,6aS)-(2S)-2-Cyclohexyl-N-(2-pyrazinylcarbonyl)glycyl-3-methyl-L-valyl-N-[(1S)-1-[2-(cyclopropylamino)-2-oxoacetyl]butyl]octahydrocyclopenta[c]pyrrole-1-carboxamide
IUPAC Name	(3S,3aS,6aR)-2-[(2S)-2-[[(2S)-2-cyclohexyl-2-(pyrazine-2-carbonylamino)acetyl]amino]-3,3-dimethylbutanoyl]-N-[(3S)-1-(cyclopropylamino)-1,2-dioxohexan-3-yl]-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]pyrrole-3-carboxamide
Molecular Weight	679.85
Molecular Formula	C36H53N7O6
Canonical SMILES	CCCC(C(=O)C(=O)NC1CC1)NC(=O)C2C3CCCC3CN2C(=O)C(C(C)(C)C)NC(=O)C(C4CCCCC4)NC(=O)C5=NC=CN=C5
InChI	InChI=1S/C36H53N7O6/c1-5-10-25(29(44)34(48)39-23-15-16-23)40-33(47)28-24-14-9-13-22(24)20-43(28)35(49)30(36(2,3)4)42-32(46)27(21-11-7-6-8-12-21)41-31(45)26-19-37-17-18-38-26/h17-19,21-25,27-28,30H,5-16,20H2,1-4H3,(H,39,48)(H,40,47)(H,41,45)(H,42,46)/t22-,24-,25-,27-,28-,30+/m0/s1
InChIKey	BBAWEDCPNXPBQM-GDEBMMAJSA-N
Melting Point	221-224°C (dec.)
Purity	≥98% (HPLC)
Density	1.3 g/cm3
Solubility	Soluble in water (<1 mg/ml at 25 °C), DMSO (136 mg/mL at 25 °C), ethanol (<1 mg/ml at 25 °C)
Appearance	White Solid
Application	Oligopeptides
Storage	Powder: -20°C: 3 years 4°C: 2 years In solvent: -80°C: 6 months -20°C: 1 month
Complexity	1240
Exact Mass	679.40573244
Index Of Refraction	1.584
In Vitro	Telaprevir (VX-950) is a covalent, reversible inhibitor of the NS3-4A protease with a slow-binding and slow-dissociation mechanism. Telaprevir exhibits significantly different kinetics in enzyme inhibition, which is most clearly exemplified by a very long half-life (58 min) of the bound enzyme-inhibitor complex. Telaprevir is additive to moderately synergistic with IFN-α in inhibiting HCV replication and in suppressing the emergence of resistance in replicon cells. Telaprevir reduces HCV RNA levels in a time- and dose-dependent manner. The IC50s following a 24, 48, 72, and 120 h incubation with Telaprevir are determined to be 0.574, 0.488, 0.21, and 0.139 μM, respectively, indicating an increase in inhibitory effects with time. Following three independent experiments using the 48 h incubation in the presence of 2% FBS, the average IC50 of Telaprevir is determined to be 0.354 ± 0.035 μM, and the average IC90 is 0.830 ± 0.190 μM. Telaprevir (VX-950) is a potent, selective, peptidomimetic inhibitor of the hepatitis C virus (HCV) NS3-4A serine protease, and Telaprevir demonstrates excellent antiviral activity both in genotype 1b HCV replicon cells (IC50=354 nM) and in human fetal hepatocytes infected with genotype 1a HCV-positive patient sera (IC50=280 nM).
In Vivo	There is an ~5-fold reduction of serum SEAP activity in mice dosed with Telaprevir (VX-950) at either 10 or 25 mg/kg, which has an average value (±SEM) of 18.7±8.3% or 18.4±5.4%, respectively, compare to those administered vehicle (100±28%). These data demonstrates that Telaprevir is able to inhibit the HCV NS3-4A serine protease activity in mouse liver and block cleavage and subsequent secretion of SEAP into blood circulation in these mice.
PSA	179.56000
Target	Ki: 7 nM (genotype 1 HCV NS3-4A protease)
XLogP3-AA	4.2