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Description

A cell-permeable oxothiazolo-imidazo-pyridinylidene-benzoate that competitively blocks the activity of hematopoietic protein tyrosine phosphatase (HePTP) (IC50 = 210 nM, Ki = 211 nM) and thereby induces sustained hyperactivation of ERK1/2 and p38 MAP kinase (in OKT3-stimulated Jurkat TAg T cells at 4 microM, and in mouse leukocytes (3 mg/kg, i.p.)) without affecting MEK and Akt. Shown to interact with the catalytic pocket of HePTP loop and act as a pTyr mimetic. Displays adequate selectivity over HePTP-H237A, MKP-3, VHR, STEP, PTP-SL, PTP1B, LYP, TCPTP, SHP1, SHP2, CD45 and PAR phosphatases (IC50 = 2.8, 5.2, 1.9, 6.3, 1.1, 1.7, 1.9, 1.0, 2.5, 1.1, 3.1 and 73 microM, respectively). Exhibits greater microsomal stability (t1/2 = 50 min in rat liver microsomes).