STO-609, CAS No. 52029-86-4, is a specific inhibitor of the Ca(2+)/calmodulin-dependent protein kinase kinase. STO-609 inhibits the activities of recombinant CaM-KK alpha and CaM-KK beta isoforms, with K(i) values of 80 and 15 ng/ml, respectively, and also inhibits their autophosphorylation activities. STO-609 is highly selective for CaM-KK without any significant effect on the downstream CaM kinases (CaM-KI and -IV), and the IC(50) value of the compound against CaM-KII is approximately 10 microg/ml. STO-609 is a selective and cell-permeable inhibitor of CaM-KK and that it may be a useful tool for evaluating the physiological significance of the CaM-KK-mediated pathway in vivo as well as in vitro.

Product information

CAS Number: 52029-86-4

Molecular Weight: 314.29

Formula: C19H10N2O3

Synonym:

STO-609

STO 609

STO609

Chemical Name: 7-oxo-7H-benzo[de]benzo[4,5]imidazo[2,1-a]isoquinoline-3-carboxylic acid

Smiles: OC(=O)C1=CC=C2C3=NC4=CC=CC=C4N3C(=O)C3C=CC=C1C2=3

InChiKey: MYKOWOGZBMOVBJ-UHFFFAOYSA-N

InChi: InChI=1S/C19H10N2O3/c22-18-13-5-3-4-10-11(19(23)24)8-9-12(16(10)13)17-20-14-6-1-2-7-15(14)21(17)18/h1-9H,(H,23,24)

Technical Data

Appearance: Solid Power

Purity: ≥98% (or refer to the Certificate of Analysis)

Solubility: Soluble in DMSO

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical or refer to Certificate of Analysis

Storage Condition: Dry, dark and -20 ^oC for 1 year or refer to the Certificate of Analysis.

Shelf Life: ≥12 months if stored properly.

Stock Solution Storage: 0 - 4 ^oC for 1 month or refer to the Certificate of Analysis.

Drug Formulation: To be determined.

HS Tariff Code: 382200

How to use

In Vitro:

STO-609 inhibits the activities of recombinant CaM-KKα and CaM-KKβ isoforms, with Ki values of 80 and 15 ng/mL, respectively, and also inhibits their autophosphorylation activities. STO-609 is highly selective for CaM-KK without any significant effect on the downstream CaM kinases (CaM-KI and -IV), and the IC50 value of the compound against CaM-KII is 10 μg/mL. STO-609 inhibits constitutively active CaM-KKα as well as the wild-type enzyme. In transfected HeLa cells, STO-609 suppresses the Ca2+-induced activation of CaM-KIV in a dose-dependent manner. STO-609 significantly reduces the endogenous activity of CaM-KK in SH-SY5Y neuroblastoma cells at a concentration of 1μg/mL (80% inhibitory rate).

References:

1. Fujiwara Y, Hiraoka Y, Fujimoto T, Kanayama N, Magari M, Tokumitsu H. Analysis of Distinct Roles of CaMKK Isoforms Using STO-609-Resistant Mutants in Living Cells. Biochemistry. 2015 Jun 30;54(25):3969-77. doi: 10.1021/acs.biochem.5b00149. PubMed PMID: 26050738.
2. Ma Z, Wen D, Wang X, Yang L, Liu T, Liu J, Zhu J, Fang X. Growth inhibition of human gastric adenocarcinoma cells in vitro by STO-609 is independent of calcium/calmodulin-dependent protein kinase kinase-beta and adenosine monophosphate-activated protein kinase. Am J Transl Res. 2016 Feb 15;8(2):1164-71. PubMed PMID: 27158402; PubMed Central PMCID: PMC4846959.
3. Kukimoto-Niino M, Yoshikawa S, Takagi T, Ohsawa N, Tomabechi Y, Terada T, Shirouzu M, Suzuki A, Lee S, Yamauchi T, Okada-Iwabu M, Iwabu M, Kadowaki T, Minokoshi Y, Yokoyama S. Crystal structure of the Ca²⁺/calmodulin-dependent protein kinase kinase in complex with the inhibitor STO-609. J Biol Chem. 2011 Jun 24;286(25):22570-9. doi: 10.1074/jbc.M111.251710. PubMed PMID: 21504895; PubMed Central PMCID: PMC3121401.

Products are for research use only. Not for human use.