Preparation of fully synthetic histone H3 reveals that acetyl-lysine 56 facilitates protein binding within nucleosomes.
Preparation of fully synthetic histone H3 reveals that acetyl-lysine 56 facilitates protein binding within nucleosomes.
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DOI:
10.1016/j.jmb.2011.01.003
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发表时间:
2011-04-29
影响因子:
5.6
通讯作者:
Ottesen JJ
中科院分区:
文献类型:
--
作者:
Shimko JC;North JA;Bruns AN;Poirier MG;Ottesen JJ
Post-translational modification (PTM) of histones plays a central role in genome regulation. Engineering histones with defined PTMs on one or multiple residues is crucial for understanding their function within nucleosomes and chromatin. We introduce a sequential native chemical ligation strategy suitable for the preparation of fully synthetic histone proteins, which allows for site-specific incorporation of varied PTMs throughout the sequence. We demonstrate this method with the generation of histone H3 acetylated at lysine 56 [H3(K56ac)]. H3(K56ac) is essential for transcription, replication, and repair. We examined the influence of H3(K56ac) on the targeting of a model DNA binding factor (LexA) to a site ∼30 bp within the nucleosome. We find that H3(K56ac) increases LexA binding to its DNA target site by 3-fold at physiological ionic strength. We then demonstrate that H3(K56ac) facilitates LexA binding by increasing DNA unwrapping and not by nucleosome repositioning. Furthermore, we find that H3(K56Q) quantitatively imitates H3(K56ac) function. Together these studies introduce powerful tools for the analysis of histone PTM functions.
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