|Jingjing Zhang, Di Shi, Xiaoli Li, Lin Ding, Jun Tang, Cong Liu, Katsuhiko Shirahige, Qinhong Cao& Huiqiang Lou. Rtt101-Mms1-Mms22 coordinates replicationcoupledsister chromatid cohesion andnucleosome assembly.EMBO reports. DOI: 10.15252/embr.201643807|
Rtt101-Mms1-Mms22 coordinates replicationcoupledsister chromatid cohesion andnucleosome assembly
Jingjing Zhang, Di Shi, Xiaoli Li, Lin Ding, Jun Tang, Cong Liu, Katsuhiko Shirahige, Qinhong Cao& Huiqiang Lou
Two sister chromatids must be held together by a cohesion process from their synthesis during S phase to segregation in anaphase. Despite its pivotal role in accurate chromosomesegregation, how cohesion is established remains elusive. Here, we demonstrate that yeast Rtt101-Mms1, Cul4 family E3 ubiquitin ligases are stronger dosage suppressors of loss-of-functioneco1 mutants than PCNA. The essential cohesion reaction, Eco1-catalyzed Smc3 acetylation is reduced in the absence of Rtt101-Mms1. One of the adaptor subunits, Mms22, associates directlywith Eco1. Point mutations (L61D/G63D) in Eco1 that abolish the interaction with Mms22 impair Smc3 acetylation. Importantly, an eco1LGpol30A251V double mutant displays additive Smc3ac reduction. Moreover, Smc3 acetylation and cohesion defects alsooccur in the mutants of other replication-coupled nucleosome assembly (RCNA) factors upstream or downstream of Rtt101-Mms1, indicating unanticipated cross talk between histone modifications and cohesion acetylation. These data suggest that fork-associated Cul4-Ddb1 E3s, together with PCNA, coordinate chromatin reassembly and cohesion establishment on the newly replicated sister chromatids, which are crucial for maintaining genome and chromosome stability.