 Schizosaccharomyces pombe  DNA translocases Rrp1 and Rrp2 have distinct roles at centromeres and telomeres that ensure genome stability.
The regulation of telomere and centromere structure and function is essential for maintaining genome integrity.  Schizosaccharomyces pombe  Rrp1 and Rrp2 are orthologues of  Saccharomyces cerevisiae  Uls1, a SWI2/SNF2 DNA translocase and SUMO-targeted ubiquitin ligase. Here, we show that Rrp1 or Rrp2 overproduction leads to chromosome instability and growth defects, a reduction in global histone levels and mislocalisation of centromere-specific histone Cnp1. These phenotypes depend on putative DNA translocase activities of Rrp1 and Rrp2, suggesting that Rrp1 and Rrp2 may be involved in modulating nucleosome dynamics. Furthermore, we confirm that Rrp2, but not Rrp1, acts at telomeres, reflecting a previously described interaction between Rrp2 and Top2. In conclusion, we identify roles for Rrp1 and Rrp2 in maintaining centromere function by modulating histone dynamics, contributing to the preservation of genome stability during vegetative cell growth.
Barg-Wojas A, Muraszko J, Kramarz K, Schirmeisen K, Baranowska G, Carr AM, Dziadkowiec D