Figure 6.

Three phosphorylation sites are identified in YY1. Three phosphorylation sites were identified by mass spectrometry in tryptic digests of Flag-YY1 immunoprecipitated from nocodazole-arrested HeLa cells. The location of these sites is indicated relative to the functional domains of YY1 previously reported by Austen et al. (1997). Serine 247 is found in the spacer region. Threonines 348 and 378 are found in the DNA-binding domain, specifically in the linker peptides between fingers 2–3, and 3–4.