Calbindin, Recombinant, Rat (D28K, Vitamin D-dependent Calcium-binding Protein)

Calbindins are Ca-binding proteins belonging to the troponin C superfamily. CALB28K/Calbindin1/CALB1 (D28K/Spot35 protein or cholecalcin, rat 261 aa; mouse 261 aa; human 261-aa, chromosome 8q21.3-q22.1) was originally described as 27kD induced by vitamin D in the duodenum of chicken. In mammals, it is expressed in the kidney, pancreatic islets, and brain. In brain, its synthesis is independent of vitamin D. CABP28K contains 4 active and 2 inactive EF-hand Ca-binding domains. The gene for CABP28K is clustered in the same region as carbonic anhydrase. The neurons in the brains of patients with Huntington disease are CAB28K depleted. There are two types of CaBPs: the "trigger"- and the "buffer"-CaBPs. The conformation of "trigger" type CaBPs changes upon Ca2+ binding and exposes regions on protein that interact with target molecules, thus altering their activity. The buffer-type CABP are thought to control the intracellular calcium concentration. Calbindin D-28K is found predominantly in subpopulations of central and peripheral nervous system neurons, and in certain epithelial cells involved in Ca2+ transport such as distal tubular cells and cortical collecting tubules of the kidney, and in enteric neuroendocrine cells.\n\nApplications: \nCABP28K can be used for immunoblots, absorption experiments in immunohistochemistry, radioimmunoassay and intracellular injection. For adsorption we suggest the following procedure: A- Dilute 1 microl of the monoclonal antibody 300 against calbindin D-28k in 5 ml of the usual buffer for immunohistochemistry (final dilution 1:5000). B- Add 1ug of the recombinant protein to 1 ml of the diluted antibody solution and mix well. C- Incubate for at least 6 hours in the cold. D- Apply to tissue-sections and incubate for 3 days. E- Complete the immunohistochemical reaction as usual (biotinylated second antibody, ABC-complex, DAB). As a result, the immunostaining should be strongly reduced or even completely prevented.\n\nSolubility: \nIt is recommended to reconstitute the lyophilized CABP9K in sterile 18MOmega-cm HO not less than 100ug/ml, which can then be further diluted to other aqueous solutions.\n\nStability: \nLyophilized CABP9K although stable at room temperature for 3 weeks, should be stored desiccated below -180C. Upon reconstitution CABP9K should be stored at 40C between 2-7 days and for future use below -180C. For long term storage it is recommended to add a carrier protein (0.1% HSA or BSA). Please avoid freeze-thaw cycles.

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SPECIFICATIONS

Catalog Number

C0113-17

Size

1ug

Form

Supplied as a lyophilized powder in 10mM Tris-HCl, 0.3M sodium chloride, 2mM calcium chloride, 1mM EDTA and 1mM beta-mercaptoethanol, pH 7.4.

Purity

(same/more than) 90% as determined by reducing and non-reducing SDS-PAGE Coomassie.

References

1. Structure, binding interface and hydrophobic transitions of Ca(2+)-loaded calbindin-D(28K).\n\nNat Struct Mol Biol 2006 Jun 25;\n\n2. Calbindin-D(28K) dynamically controls TRPV5-mediated Ca(2+) transport.\n\nEMBO J 2006 Jun 8;\n\n3. Upregulation of calbindin-D(28k) expression during regeneration in the adult fish cerebellum.\n\nBrain Res 2006 Jun 20;1095(1):26-34\n\n4. Parvalbumin and calbindin D-28k immunoreactivity in transgenic mice with a G93A mutant SOD1 gene.\n\nBrain Res 2006 Apr 14;1083(1):196-203\n\n5. Calbindin-D(28k) decreases L-type calcium channel activity and modulates intracellular calcium homeostasis in response to K(+) depolarization in a rat beta cell line RINr1046-38.\n\nCell Calcium 2006 Jun;39(6):475-85\n\n6. Calretinin-containing neurons which co-express parvalbumin and calbindin D-28k in the rat spinal and cranial sensory ganglia; triple immunofluorescence study.\n\nBrain Res 2005 Nov 9;1061(2):118-23