Fig. 3.

Transcriptional stimulation by promoter-proximal Z-DNA with respect to its distance from TATA box. (A and B) β-galactosidase reporter activities as a function of separation distances between upstream Z-forming d(CG)₉ repeat sequence and TATA box. Control indicates the absence of promoter-proximal Z-DNA-forming d(CG)₉ sequence, where it is replaced by a random sequence of approximately equal length (shortened by 3 bp). Average β-galactosidase activities and SDs were derived from a single representative experiment performed with each of four independent colonies per yeast reporter strain.