Creatine kinase B-type/CKB Protein, Human (His)

Creatine kinaseB-type/CKB Protein, Human (His) is the most abundant creatine kinase isoenzyme in purified brown adipocytes. CKB reversibly catalyzes the transfer of phosphate between ATP and various phosphogens.

Creatine kinase B (CKB) is indispensable for thermogenesis resulting from the futile creatine cycle, during which it traffics to mitochondria using an internal mitochondrial targeting sequence. CKB is powerfully induced by thermogenic stimuli in both mouse and human adipocytes. Adipocyte-selective inactivation of Ckb in mice diminishes thermogenic capacity, increases predisposition to obesity, and disrupts glucose homeostasis. CKB is therefore a key effector of the futile creatine cycle^[1].

Measured by its ability to phosphorylate creatine. The specific activity is 248.967 pmol/min/μg, as measured under the described conditions.

Human

E. coli

N-6*His

P12277 (M1-K381)

1152  [NCBI]

MPFSNSHNALKLRFPAEDEFPDLSAHNNHMAKVLTPELYAELRAKSTPSGFTLDDVIQTGVDNPGHPYIMTVGCVAGDEESYEVFKDLFDPIIEDRHGGYKPSDEHKTDLNPDNLQGGDDLDPNYVLSSRVRTGRSIRGFCLPPHCSRGERRAIEKLAVEALSSLDGDLAGRYYALKSMTEAEQQQLIDDHFLFDKPVSPLLLASGMARDWPDARGIWHNDNKTFLVWVNEEDHLRVISMQKGGNMKEVFTRFCTGLTQIETLFKSKDYEFMWNPHLGYILTCPSNLGTGLRAGVHIKLPNLGKHEKFSEVLKRLRLQKRGTGGVDTAAVGGVFDVSNADRLGFSEVELVQMVVDGVKLLIEMEQRLEQGQAIDDLMPAQK

Approximately 50.0 kDa

Greater than 90% as determined by reducing SDS-PAGE

Solution

Supplied as a 0.2 μm filtered solution of 20 mM Tris-HCl, 150 mM NaCl, 10% Glycerol, pH 7.5.

<1 EU/μg, determined by LAL method.

Stored at -80°C for 1 year. It is stable at -20°C for 3 months after opening. It is recommended to freeze aliquots at -80°C for extended storage. Avoid repeated freeze-thaw cycles.

Shipping with dry ice.

• [1]. Janane F Rahbani, et al. Creatine kinase B controls futile creatine cycling in thermogenic fat. Nature. 2021 Feb;590(7846):480-485.  [Content Brief]