The effects of transcription factors S-II and S-II′, a phosphorylated form of S-II, on accurate transcription were compared in a reconstituted transcription system greatly depleted of S-II. S-II, but not S-II′, stimulated the syntheses of run-off products of various truncated class II genes in this system, suggesting that the activity of this factor is regulated by its phosphorylation and dephosphorylation. © 1988.
Hirai, H., Sekimizu, K., Horikoshi, M., Nakanishi, Y., & Natori, S. (1988). Stimulation of transcription from accurate initiation sites by purified S-II. FEBS Letters, 238(1), 119–122. https://doi.org/10.1016/0014-5793(88)80239-4