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Promega Corporation

Casein Kinase I

Casein Kinase I (CKI or CK-1) is a ubiquitous and highly conserved serine/threonine protein kinase found in eukaryotic cells. CKI exists in multiple forms in mammalian tissue and is present in the nucleus, cytosol, plasma membrane and microsomes. CKI isolated from most species is a 35–37kDa monomer. In contrast to Casein Kinase II, CKI primarily uses Mg2+/ATP as the phosphate donor and is not sensitive to heparin inhibition.

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Casein Kinase I

- V5631 Please Enquire


E. coli strain expressing a recombinant CKI clone derived from a rat testis cDNA library.

Storage Buffer

20mM Tris-HCl (pH 7.0 at 25°C), 1mM EDTA, 2mM DTT, 250mM NaCl, 1mM EGTA, 0.1% Triton® X-100 and 50% glycerol.

Storage Conditions

Store at –20°C.

Unit Definition

One unit is the amount of enzyme required to transfer 1pmol of phosphate per minute at 37°C to the casein substrate.

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