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Structure 23312—321. Cell Cycle 41834—1841. The crystal structure of the tandem Tudor domain of 53BP1 revealed that the first Tudor repeat of this domain forms an aromatic cage that bruke di-methyl lysine recognition [ 85 ]. Bannister AJ, Kouzarides T. Nature 458591—596. Riballo E, et al.

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RNF168-mediated ubiquitylation is critical for the recruitment of 53BP1 her er linken 4142 ]. B 37220160281 10. The cell has evolved multiple mechanisms to deal with DSBs, which must be highly tailored to the specific incident. While 53BP1 is a bona fide modulator of p53 [ 130131 ], it has a separate and better-characterized role in the repair of DSBs, as a key regulator of the NHEJ pathway [ 132133 ]. Cell 47383—395. While not absolutely essential for the recruitment or repair function of 53BP1 [ 140 — 142 ], mutations in the BRCT domain lead to persistent γ-H2AX signalling after damage, characteristic of impaired heterochromatin repair [ 82 ]. Cell Cycle 9389—397.

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Structural and biochemical studies using isolated fragments will be crucial in our understanding of chromatin reading at DNA DSBs. Wilson MD, et al. A role for the Tip60 histone acetyltransferase in the acetylation and activation of ATM. Adding insult to injury, the acetyltransferase can then acetylate the primary ubiquitin acceptor site H2A Lys-15, blocking the ubiquitylation by RNF168 and preventing ubiquitin-based recognition by 53BP1. A brief histone in time:

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