Replication protein A (RPA) is a heterotrimeric complex involved in many aspects of DNA metabolism, such as replication and DNA damage responses (DDR). Post-translational modifications (PTM) are important for RPA regulation and to support the multiple functions that RPA mediates. In mammalian cells following DNA damage RPA is phosphorylated at multiple sites, and which serve to initiate a repair and checkpoint response. In trypanosomatids, although the RPA-1 homologue lacks the major domain involved in interaction with repair and checkpoint proteins in mammals, we have evidence that RPA is involved in DDR. Our previous data suggest that RPA is modified after DNA damage, but how this modification affects RPA function and what additional protein partners are required for the response remains unknown. In this project, we will use cryomilling technology followed by immunoprecipitation and mass spectrometry analysis to identify PTM and interactors of the RPA complex following DNA damage in Trypanosoma brucei. These new findings will contribute to elucidating the mechanisms and pathways that regulate parasite surveillance following genotoxic stress.
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