1. Metabolic Enzyme/Protease
  2. Gutathione S-transferase

TLK117 (Synonyms: TER117)

目录号: HY-13634B

TLK197是TLK199的活性代谢物,选择性抑制谷胱甘肽S-转移酶P1-1 (Glutathione S-transferase P1–1 (GSTP1-1)),结合 GSTP的 Ki 值为0.4 μM。 TLK117还竞争性地抑制乙二醛酶I (glyoxalase I), Ki值为0.56 μM。

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TLK117 Chemical Structure

TLK117 Chemical Structure

CAS No. : 152684-53-2

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TLK117, the active metabolite of TLK199, selective inhibits Glutathione S-transferase P1–1 (GSTP1-1) with a Ki of 0.4 μM for GSTP. TLK117 also competitively inhibits glyoxalase I with a Ki of 0.56 μM.

IC50 & Target

Ki: 0.4 μM[1], 0.56 μM (glyoxalase I)[2]

In Vitro

TLK117 is the most specific GSTP inhibitor to date, with a binding affinity greater than GSH itself and a selectivity for GSTP over 50-fold greater than the GSTM and GSTA classes (Ki=0.4 μM)[1]. TER 117 is developed as a GST P1-1 isoenzyme inhibitor to circumvent the indicated contribution of GST P1-1 to drug resistance of tumor cells. To facilitate the cellular uptake of TER 117, it is delivered as a diethyl ester (TER 117 DEE, also called TER 199). TER 117 is found to be a competitive inhibitor of both GST P1-1 and glyoxalase I[2].

In Vivo

Oropharyngeal administration of the GSTP inhibitor, TLK117, at a time when fibrosis is already apparent, attenuated bleomycin- and AdTGFβ-induced remodeling, α-SMA, caspase activation, FAS S-glutathionylation, and total protein S-glutathionylation. Four hours after administration of 50 mg/kg TLK117, GSTP activity is strongly decreased and remains decreased by about 60% for at least 24 hours[2].

Solvent & Solubility
In Vitro: 

10 mM in DMSO

Stock Solutions
Concentration Solvent Mass 1 mg 5 mg 10 mg
1 mM 2.1118 mL 10.5588 mL 21.1175 mL
5 mM 0.4224 mL 2.1118 mL 4.2235 mL
10 mM 0.2112 mL 1.0559 mL 2.1118 mL
*Please refer to the solubility information to select the appropriate solvent.
Kinase Assay

The potency of TER 117 in the inhibition of GST P1-1/Ile-105 and GST P1-1/Val-105 is determined by means of GSH competition experiments using 1 μM TER 117 and three different fixed concentrations of GSH: 0.2, 0.6, and 2.0 mM. The concentration of the second substrate, 1-chloro-2,4-dinitrobenzene (CDNB) ranged between 0.15 and 1.8 mM. In addition, the inhibitor is tested at different concentrations, 0 to 8 μM, at a CDNB concentration of 1 mM and the above GSH concentrations. Initial velocities are determined spectrophotometrically at 30°C. The conjugation reaction between GSH and CDNB is monitored at 340 nm in 1 mL of 0.1 M sodium phosphate, pH 7.0[2].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Animal Administration


TLK117 is administered oropharyngeally at a dose of 50 mg/kg in a 0.375 M Tris-HCl solution, pH =7.4, with 0.02% DMSO. This Tris-HCl/DMSO solution is used as a vehicle control. Treatments are performed once every 3 days from day 14 to day 26 in both >bleomycin and AdTGFβ models

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Molecular Weight









Please store the product under the recommended conditions in the Certificate of Analysis.


Room temperature in continental US; may vary elsewhere

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Cat. No.: HY-13634B