Restricted accessResearch articleFirst published online 2012-06
Physical Links Between the Nuclear Envelope Protein Mps3,Three Alternate Replication Factor C Complexes,and a Variant Histone in Saccharomyces cerevisiae
Viability of cell progeny upon cell division require that genomes are replicated, repaired, and maintained with high fidelity. Central to both DNA replication and repair are Replication Factor C (RFC) complexes which catalyze the unloading/loading of sliding clamps such as PCNA or 9-1-1 complexes on DNA. Budding yeast contain four alternate RFC complexes which play partially redundant roles. Rfc1, Ctf18, Rad24, and Elg1 are all large subunits that bind, in a mutually exclusive fashion to RFC 2–5 small subunits. Ctf18, Rad24, and Elg1 are of particular interest because, in addition to their roles in maintaining genome integrity, all three play critical roles in sister chromatid tethering reactions that appear coupled to their roles in DNA replication/repair. Intriguingly, the nuclear envelope protein Mps3 similarly exhibits roles in repair and cohesion, leading us to hypothesize that Mps3 and RFCs function through a singular mechanism. Here we report that the nuclear envelope protein Mps3 physically associates with all three of these large RFC complex subunits (Ctf18, Elg1, and Rad24). In addition we report a physical interaction between Mps3 and the histone variant Htz1, a factor previously shown to promote DNA repair. In combination, these findings reveal a direct link between the nuclear envelope and chromatin and provide support for a model that telomeres and chromatin interact with the nuclear envelope during both DNA repair and sister chromatid pairing reactions.
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