Not known; weak suppressor of a mutant of the subunit AC40 of DNA dependent RNA polymerase I and III. Pyrophosphorylated by 5-diphosphoinositol pentakisphosphate (5-IP7) (PubMed:15604408). Serine pyrophosphorylation is achieved by Mg(2+)-dependent, but enzyme independent transfer of a beta-phosphate from a inositol pyrophosphate to a pre-phosphorylated serine residue (PubMed:15604408, PubMed:17873058). Present with 12900 molecules/cell in log phase SD medium.