Structural plasticity of methyllysine recognition by the tandem tudor domain of 53BP1.

作者: Qiong Tong , Gaofeng Cui , Maria Victoria Botuyan , Scott B. Rothbart , Ryo Hayashi

DOI: 10.1016/J.STR.2014.11.013

关键词: Peptide sequenceTudor domainDNA methylationHistoneMethyllysinePeptideProtein structureComputational biologyFunction (biology)BiologyBiochemistry

摘要: p53 is dynamically regulated through various posttranslational modifications (PTMs), which differentially modulate its function and stability. The dimethylated marks p53K370me2 p53K382me2 are associated with activation or stabilization both recognized by the tandem Tudor domain (TTD) of 53BP1, a cofactor. Here we detail molecular mechanisms for recognition 53BP1. solution structures TTD in complex peptides show remarkable plasticity 53BP1 accommodating these diverse dimethyllysine-containing sequences. We demonstrate that dimeric TTDs capable interacting two PTMs on single p53K370me2K382me2 peptide, greatly strengthening 53BP1-p53 interaction. Analysis binding affinities toward methylated histones reveals strong preference p53K382me2, H4K20me2, H3K36me2 suggests possible role multivalent contacts targeting to accumulation at sites DNA damage.

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