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. 1994 Mar 29;91(7):2597–2601. doi: 10.1073/pnas.91.7.2597

Ctk: a protein-tyrosine kinase related to Csk that defines an enzyme family.

S Klages 1, D Adam 1, K Class 1, J Fargnoli 1, J B Bolen 1, R C Penhallow 1
PMCID: PMC43416  PMID: 7511815

Abstract

We used the polymerase chain reaction with degenerate oligonucleotide primers to search for Csk-related kinases. A cDNA coding for a Csk-like protein-tyrosine kinase was cloned from mouse brain and was designated ctk, for csk-type protein-tyrosine kinase. The 1.9-kb ctk mRNA was found to be expressed predominantly in brain and capable of encoding a 52-kDa protein-tyrosine kinase. The amino acid sequence of Ctk was found to possess 53% identity with mouse Csk, shared all the predicted structural features of Csk, and was capable of phosphorylating the carboxyl-terminal conserved tyrosine of Src family members. Our results thereby indicate that ctk represents a gene that defines a family of structurally and functionally related Csk-like protein-tyrosine kinases.

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