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By performing DNase I footprint and band-shift analyses of a 170-base-pair region of the murine thymidine kinase promoter, we identified an inducible DNA binding activity that we named Yi. Yi binding activity was not detected in G0 and G1 extracts, but it was observed as cells crossed the G1/S boundary. Yi proteins bind specifically to a consensus sequence (CCCNCNNNCT) found at three distinct sites in this promoter region. We also observed a murine Sp1 binding activity that was constitutive throughout the cell cycle. We propose that the G1/S-specific Yi binding is important for murine thymidine kinase gene regulation and perhaps also for initiation of DNA synthesis.

Inducible proteins binding to the murine thymidine kinase promoter in late G1/S phase.