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• W808110422 abstract "Cell cycle checkpoints provide surveillance mechanisms to activate the DNA damage response, thus preserving genomic integrity. The heterotrimeric Rad9-Rad1-Hus1 (9-1-1) clamp is a DNA damage response sensor and can be loaded onto DNA. 9-1-1 is involved in base excision repair (BER) by interacting with nearly every enzyme in BER. Here, we show that individual 9-1-1 components play distinct roles in BER directed by MYH DNA glycosylase. Analyses of Hus1 deletion mutants revealed that the interdomain connecting loop (residues 134-155) is a key determinant of MYH binding. Both the N-(residues 1-146) and C-terminal (residues 147-280) halves of Hus1, which share structural similarity, can interact with and stimulate MYH. The Hus1(K136A) mutant retains physical interaction with MYH but cannot stimulate MYH glycosylase activity. The N-terminal domain, but not the C-terminal half of Hus1 can also bind DNA with moderate affinity. Intact Rad9 expressed in bacteria binds to and stimulates MYH weakly. However, Rad9(1-266) (C-terminal truncated Rad9) can stimulate MYH activity and bind DNA with high affinity, close to that displayed by heterotrimeric 9(1-266)-1-1 complexes. Conversely, Rad1 has minimal roles in stimulating MYH activity or binding to DNA. Finally, we show that preferential recruitment of 9(1-266)-1-1 to 5'-recessed DNA substrates is an intrinsic property of this complex and is dependent on complex formation. Together, our findings provide a mechanistic rationale for unique contributions by individual 9-1-1 subunits to MYH-directed BER based on subunit asymmetry in protein-protein interactions and DNA binding events." @default.
• W808110422 created "2016-06-24" @default.
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• W808110422 date "2015-07-01" @default.
• W808110422 modified "2023-10-03" @default.
• W808110422 title "Association of the Rad9–Rad1–Hus1 checkpoint clamp with MYH DNA glycosylase and DNA" @default.
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• W808110422 doi "https://doi.org/10.1016/j.dnarep.2015.05.004" @default.
• W808110422 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4458174" @default.
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