Functions of human replication protein A (RPA): from DNA replication to DNA damage and stress responses

Journal of Cellular Physiology
Yue ZouSteven M Shell

Abstract

Human replication protein A (RPA), a heterotrimeric protein complex, was originally defined as a eukaryotic single-stranded DNA binding (SSB) protein essential for the in vitro replication of simian virus 40 (SV40) DNA. Since then RPA has been found to be an indispensable player in almost all DNA metabolic pathways such as, but not limited to, DNA replication, DNA repair, recombination, cell cycle, and DNA damage checkpoints. Defects in these cellular reactions may lead to genome instability and, thus, the diseases with a high potential to evolve into cancer. This extensive involvement of RPA in various cellular activities implies a potential modulatory role for RPA in cellular responses to genotoxic insults. In support, RPA is hyperphosphorylated upon DNA damage or replication stress by checkpoint kinases including ataxia telangiectasia mutated (ATM), ATR (ATM and Rad3-related), and DNA-dependent protein kinase (DNA-PK). The hyperphosphorylation may change the functions of RPA and, thus, the activities of individual pathways in which it is involved. Indeed, there is growing evidence that hyperphosphorylation alters RPA-DNA and RPA-protein interactions. In addition, recent advances in understanding the molecular basis of the st...Continue Reading

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