Biochem/physiol Actions

Reversible: yes

Primary TargetCryptocrome protein

Cell permeable: yes

General description

A cell-permeable carbazole compound that competes against FAD (flavin adenine dinucleotide) for cryptocrome (CRY) 1 & 2 binding, displaying little affinity toward other clock proteins (PER1/2, CLOCK, or BMAL1) or inhibitory activity against casein kinase (CKIα, CKIδ, and CK2) activity even at concentrations as high as 100 µM. Shown to selectively stabilize cellular CRY1/2 protein, but not mRNA, by preventing FBXL3-mediated CRY1/2 ubiquitination and proteasomal degradation, effectively lengthening the period and reducing the amplitude of the circadian transcription rhythms of Bmal1 and Per2 promoter-mediated transcription activity (IC₅₀ of intensity reduction = 14 and 0.82 µM, respectively, in U2OS reporter assay). KL001 is also reported to block glucagon-induced Pck1 and G6pc mRNA upregulation as well as glucose production in primary murine hepatocyte cultures (IC₅₀﹤8 µM). Longdaysin (Cat. No. 438075), in comparison, exerts its circadian perturbation activity via casein kinase inhibition.

Legal Information

CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany

Other Notes

Hirota, T., et al. 2012. Science337, 1094.

Packaging

25 mg in Glass bottle

Packaged under inert gas

Reconstitution

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

Warning

Toxicity: Standard Handling (A)