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STO-609 | CAMKK inhibitor

STO-609 (1173022-21-3) is a selective inhibitor of Ca2+-calmodulin-dependent protein kinase kinase (Ki = 80 and 15 ng/ml for inhibition of CaM-KKα and CaM-KKβ respectively).1 Binds to the  ATP-binding site.2 Displays > 80-fold selectivity over CaMK1, CaMK2, CaMK4, MLCK, PKC, PKA and p42 MAPK. Important tool for probing distinct CaMK pathways in LTP.3 Reduces starvation-induced autophagosomal membrane formation.4 Reverses age-associated decline in bone mass.5 Stimulates osteoblast formation, inhibits osteoclast differentiation.6

1) Tokumitsu et al. (2002), STO-609, a Specific Inhibitor of the Ca2+/Calmodulin-dependent Protein Kinase Kinase; J. Biol. Chem. 277 15813
2) Tokumitsu et al. (2003) A single amino acid difference between alpha and beta Ca2+/calmodulin-dependent protein kinase kinase dictates sensitivity to the specific inhibitor, STO-609; J. Biol. Chem. 278 10908
3) Redondo et al. (2010) Synaptic tagging and capture: differential role of distinct calcium/calmodulin kinases in protein synthesis-dependent long-term potentiation; J. Neurosci. 30 4981
4) Pfisterer et al. (2011) Ca+2/calmodulin –dependent kinase (CaMK) signaling via CaMKI and AMP-activated protein kinase contributes to the regulation of WIPI-1 ar the onset of autophagy; Mol. Pharmacol. 80 1066
5) Pritchard et al. (2015) Inhibition of CaMKK2 reverese age-associated decline in bone mass; Bone, 75 120
6)Cary et al. (2013) Inhibition of Ca+2/Calmodulin-dependent protein kinase kinase 2 stimulates osteoblast formation and inhibits osteoclast differentiation; J. Bone Miner. Res. 28 1599
7) Matsukawa et al. (2017) Upregulation of skeletal muscle PGC-1α through the elevation of cyclic AMP levels by Cyanidin-3-glucoside enhances exercise performance; Sci. Rep., 7 44799


Focus Biomolecules cell signaling reagent supplier, chemical structure of STO-609 | CAMKK inhibitor | CAS 1173022-21-3

Catalog#  10-1036

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Catalog Number:
CAMKK inhibitor
Chemical Name:
7-Oxo-7H-benzimidazo[2,1-a]benz[de]isoquinoline-3-carboxylic acid acetate
Molecular Weight:
Molecular Formula:
Soluble in DMSO (up to 10 mg/ml).
Physical Properties:
Yellow solid
98% by TLC
NMR (Conforms)
Storage Temperature:
Stable for 2 years as supplied. Solutions in DMSO may be stored at -20°C for up to 3 months.
Shipping Code:
Materials provided by Focus Biomolecules are for laboratory research use only and are not intended for human or veterinary applications.

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