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  • 420298-M - K-252a, Nocardiopsis sp. - CAS 97161-97-2 - Calbiochem

420298-M Millipore

K-252a, Nocardiopsis sp. - CAS 97161-97-2 - Calbiochem

A cell-permeable, reversible, and ATP-competitive inhibitor against multiple protein kinases.

Synonym: K-252a, Nocardiopsis sp. - CAS 97161-97-2 - Calbiochem

  • CAS Number 97161-97-2

  • Empirical Formula (Hill Notation) C27H21N3O5

  • Molecular Weight 467.47



Related Categories A to C, Biochemicals and Reagents, Calmodulin dependent Protein Kinase (CaM-KK), Cell Biology, Cell Signaling and Neuroscience,
Quality Level   100
assay   ≥95% (HPLC)
form   solid
mfr. no.   Calbiochem®
storage condition   OK to freeze
  protect from light
storage conditions   -20C
color   white
solubility   DMSO: 1 mg/mL
  DMF: soluble
InChI   1S/C27H21N3O5/c1-26-27(33,25(32)34-2)11-18(35-26)29-16-9-5-3-7-13(16)20-21-15(12-28-24(21)31)19-14-8-4-6-10-17(14)30(26)23(19)22(20)29/h3-10,18,33H,11-12H2,1-2H3,(H,28,31)


General description

A cell-permeable, reversible, and ATP-competitive inhibitor against multiple protein kinases, including, but not limited to, CaM kinase II (Ki = 1.8 nM), myosin light chain kinase (Ki = 20 nM), protein kinase A (Ki = 18 nM), protein kinase C (Ki = 25 nM), protein kinase G (Ki = 20 nM), NGF receptor gp140trk (IC50 = 3 nM), its transforming trk oncogenes, and the related neurotrophin receptors gp145trkB and gp145trkC. Reported to induce apoptosis and cell cycle arrest by decreasing Cdk1 and Cdc25c activity in T98G cells and inhibit Flt3 phosphorylation in Flt3/Itd-BaF3 cells (IC50<50 nM). Also available as a premade 1 mM (100 µg/214 µl) solution in DMSO (Cat. No. 420297).

Biochem/physiol Actions

Primary Target
CaM kinase II

Target Ki: 1.8 nM, 20 nM, 18 nM, 25 nM, 20 nM, 3 nM, against CaM kinase II, myosin light chain kinase, protein kinase A, protein kinase C, protein kinase G, NGF receptor gp140trk, respectively


Toxicity: Standard Handling (A)


Following reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 6 months at -20°C.

Other Notes

Cools, J., et al. 2004. Cancer Res. 64, 6385.
Chin, L.S., et al. 1999. Cancer Invest. 17, 391.
Tapley, P., et al. 1992. Oncogene 7, 371.
Hashimoto, Y. 1991. Biochem. Biophys. Res. Commun. 181, 423.
Nakanishi, S. 1988. J. Biol. Chem. 263, 6215.
Kase, H., et al. 1987. Biochem. Biophys. Res. Commun. 142, 436.

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