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Previous studies had indicated that lack of Zn2+ inhibits the expression of thymidine kinase activity and produces a corresponding reduction in the concentration of its mRNA. The present investigations have shown that with human thymidine kinase this is associated with increased binding of a specific protein to the gene's promoter in the region between -55 and -83 bp 5' to the transcription initiation site. A second binding site for the protein is present within the sixth exon of the human thymidine kinase gene.

Role of the promoter in the sensitivity of human thymidine kinase to lack of Zn2+