Studies on the SUMO modification system : Towards understanding regulation of the nuclear function and structure

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The small ubiquitin-related modifier 2/3 (SUMO2/3) can be post-translationally conjugated to a wide variety of proteins constituting chromatin, the platform for genetic and epigenetic regulation. Nevertheless, it is unclear how SUMO2/3 and SUMO2/3 modified proteins are delivered to the chromatin fibers. We report that the largest subunit of chromatin assembly factor 1 (CAF-1), human p150, which, in the context of DNA replication, promotes chromatin assembly, interacts directly and preferentially with SUMO2/3. Our findings suggest an expanded role of p150 as a SUMO2/3-interacting factor, and raise the intriguing possibility that p150 plays a role in promoting delivery of SUMO2/3 or SUMO2/3 modified proteins (or both) on chromatin fibers during replication.