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Expression of Human Tyrosine Kinase, Lck, in Yeast Saccharomyces cerevisiae: Growth Suppression and Strategy for Inhibitor Screening

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We report the successful expression and detection of a phosphorylated form of human T cell tyrosine kinase, Lck, in Saccharomyes cerevisiae, which leads to growth suppression of the yeast cells. Expression of an inactive Lck mutant resulted in no phosphorylation and no growth suppression, indicating that cell growth inhibition by Lck is due to the activity of the kinase, consistent with the observed tyrosine-phosphorylation of the Lck and yeast host cell proteins. The addition of a known inhibitor of Lck to the cell culture resulted in recovery of cell growth expressing the active Lck, suggesting that the growth inhibition by lck gene expression can be used to screen inhibitors for the gene product. We have extended such approach to Tob, another potential therapeutic target.

Keywords: Expression; Inhibitor screening; Lck; Saccharomyces cerevisiae; Tob; Tyrosine kinase

Document Type: Research Article


Affiliations: Applied and Molecular Microbiology, Faculty of Agriculture, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan.

Publication date: September 1, 2006

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.

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