WHI-P258
目录号 : GC38053A negative control for JAK3 inhibition
Cas No.:21561-09-1
Sample solution is provided at 25 µL, 10mM.
Quality Control & SDS
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- Purity: >99.50%
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- SDS (Safety Data Sheet)
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WHI-P258 is a quinazoline compound that modeling studies suggested would bind to the active site of JAK3 with an estimated Ki value of 72 ?M.1 However, it is inactive at JAK3 (IC50 = >300 ?M) and has been used as a negative control for structurally similar compounds that inhibit platelet aggregation and herpes simplex virus 1 (HSV-1) replication.2,3
1.Sudbeck, E.A., Liu, X.P., Narla, R.K., et al.Structure-based design of specific inhibitors of Janus kinase 3 as apoptosis-inducing antileukemic agentsClin. Cancer Res.5(6)1569-1582(1999) 2.Yakota, S.-i., Yokosawa, N., Okabayashi, T., et al.Induction of suppressor of cytokine signaling-3 by herpes simplex virus type 1 confers efficient viral replicationVirology338(1)173-181(2005) 3.Tibbles, H.E., Vassilev, A., Wendorf, H., et al.Role of a JAK3-dependent biochemical signaling pathway in platelet activation and aggregationJ. Biol. Chem.276(21)17815-17822(2001)
Cas No. | 21561-09-1 | SDF | |
Canonical SMILES | COC1=CC2=NC=NC(NC3=CC=CC=C3)=C2C=C1OC | ||
分子式 | C16H15N3O2 | 分子量 | 281.31 |
溶解度 | DMSO: 31.25 mg/mL (111.09 mM) | 储存条件 | Store at -20°C |
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1 mg | 5 mg | 10 mg | |
1 mM | 3.5548 mL | 17.774 mL | 35.548 mL |
5 mM | 0.711 mL | 3.5548 mL | 7.1096 mL |
10 mM | 0.3555 mL | 1.7774 mL | 3.5548 mL |
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2.
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Structure-based design of specific inhibitors of Janus kinase 3 as apoptosis-inducing antileukemic agents
Clin Cancer Res 1999 Jun;5(6):1569-82.PMID:10389946doi
A novel homology model of the kinase domain of Janus kinase (JAK) 3 was used for the structure-based design of dimethoxyquinazoline compounds with potent and specific inhibitory activity against JAK3. The active site of JAK3 in this homology model measures roughly 8 A x 11 A x 20 A, with a volume of approximately 530 A3 available for inhibitor binding. Modeling studies indicated that 4-(phenyl)-amino-6,7-dimethoxyquinazoline (parent compound WHI-258) would likely fit into the catalytic site of JAK3 and that derivatives of this compound that contain an OH group at the 4' position of the phenyl ring would more strongly bind to JAK3 because of added interactions with Asp-967, a key residue in the catalytic site of JAK3. These predictions were consistent with docking studies indicating that compounds containing a 4'-OH group, WHI-P131 [4-(4'-hydroxyphenyl)-amino-6,7-dimethoxyquinazoline], WHI-P154 [4-(3'-bromo-4'-hydroxylphenyl)-amino-6,7-dimethoxyquinazoline], and WHI-P97 [4-(3',5'-dibromo-4'-hydroxylphenyl)-amino-6,7-dimethoxyquinazolin e], were likely to bind favorably to JAK3, with estimated K(i)s ranging from 0.6 to 2.3 microM. These compounds inhibited JAK3 in immune complex kinase assays in a dose-dependent fashion. In contrast, compounds lacking the 4'-OH group, WHI-P79 [4-(3'-bromophenyl)-amino-6,7-dimethoxyquinazoline], WHI-P111 [4-(3'-bromo-4'-methylphenyl)-amino-6,7-dimethoxyquinazoline], WHI-P112 [4-(2',5'-dibromophenyl)-amino-6,7-dimethoxyquinazoline], WHI-P132 [4-(2'-hydroxylphenyl)-amino-6,7-dimethoxyquinazoline], and WHI-P258 [4-(phenyl)-amino-6,7-dimethoxyquinazoline], were predicted to bind less strongly, with estimated K(i)s ranging from 28 to 72 microM. These compounds did not show any significant JAK3 inhibition in kinase assays. Furthermore, the lead dimethoxyquinazoline compound, WHI-P131, which showed potent JAK3-inhibitory activity (IC50 of 78 microM), did not inhibit JAK1 and JAK2, the ZAP/SYK family tyrosine kinase SYK, the TEC family tyrosine kinase BTK, the SRC family tyrosine kinase LYN, or the receptor family tyrosine kinase insulin receptor kinase, even at concentrations as high as 350 microM. WHI-P131 induced apoptosis in JAK3-expressing human leukemia cell lines NALM-6 and LC1;19 but not in melanoma (M24-MET) or squamous carcinoma (SQ20B) cells. Leukemia cells were not killed by dimethoxyquinazoline compounds that were inactive against JAK3. WHI-P131 inhibited the clonogenic growth of JAK3-positive leukemia cell lines DAUDI, RAMOS, LC1;19, NALM-6, MOLT-3, and HL-60 (but not JAK3-negative BT-20 breast cancer, M24-MET melanoma, or SQ20B squamous carcinoma cell lines) in a concentration-dependent fashion. Potent and specific inhibitors of JAK3 such as WHI-P131 may provide the basis for the design of new treatment strategies against acute lymphoblastic leukemia, the most common form of childhood cancer.