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Synonyms
CSK, C-src tyrosine kinase
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Alternative_names
CSK, C-src tyrosine kinase, Protein-tyrosine kinase CYL
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Description
Phosphorylates human Src
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Recombinant
Yes
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Source
Baculovirus (Sf9 insect cells)
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Purity by SDS PAGE
≥85%
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Assay
SDS-PAGE
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Activity Specifications test method
425 nmol phosphate incorporated into Poly(Glu-Tyr) per minute per mg protein at 30°C for 15 minutes using a final concentration of 50 µM ATP (0.83 µCi/assay).
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Molecular Weight
78.0 kDa
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Storage Temp
-80°C
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Shipping
dry ice
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Shelf Life
12 months
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Concentration
5µg/50 µl
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Appearance
Lyophilized powder
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Physical form description
Lyophilized from sterile 20 mM Tris, 500 mM NaCl, 0.5 mM PMSF, pH 7.4, 5% trehalose and 5% mannitol.
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Background Information
CSK is a cytoplasmic tyrosine kinase that has been shown to downregulate the tyrosine kinase activity of the c-src oncoprotein through tyrosine phosphorylation of the c-src carboxy terminus (1). Cell transformation by src oncoprotein is caused by several oncogenic mechanisms, which interfere with the carboxy terminal phosphorylation. The CSK could therefore potentially function as an anti-oncogene. CSK is ubiquitously expressed in human tissues as 2 mRNA species of 2.6 and 3.4 kb, although in some tissues and cell lines, only the larger mRNA is detected (2). A yeast 2-hybrid system has been used to identify proteins associated with CSK. The Src homology-3 (SH3) domain of CSK associates with a proline-rich region of PEP, a protein-tyrosine phosphatase expressed in hemopoietic cells (2). This association is highly specific and it is speculated that PEP may be an effector and/or regulator of CSK in T cells and other hemopoietic cells. An in situ hybridization has been used to map the CSK gene to chromosome 15q23-q25 (3).
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Handling
Centrifuge the vial prior to opening.
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Usage
For Research Use Only! Not to be used in humans
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