This region is present in both eukaryotes and eubacteria. The yeast PSP1 protein is involved in suppressing mutations in the DNA polymerase alpha subunit in yeast [1].

1: Suppressors of the temperature sensitivity of DNA polymerase alpha mutations in Saccharomyces cerevisiae. Formosa T, Nittis T; Mol Gen Genet 1998;257:461-468. PMID:9529527