histone 变体的翻译修正正在玩的帖子在 chro- 早课,基因活动的规定和疾病的诊断的结构的一个重要角色,和进行的深入的研究和发现新地点取决于新、合理的分析方法到某程度。在这个工作,高分辨率 LTQ-Orbitrap 集体 spectrometry 和多重酶的组合方法被采用识别柱子人的肝房间的 histone H4 的翻译修正(PTM ) 。新奇 methylation 地点, argnine 67 (R 67 ) ,除以前报导例如离氨酸 31 的一些地点(K 31 ) 以外被观察,离氨酸 44 (K 44 ) , argnine 55 (R 55 ) 并且离氨酸 59 (K 59 ) 在全球领域。同时,离氨酸 5 的 acetylation ( K 5 )的各种各样的联合,离氨酸 8 ( K 8 ),离氨酸 12 ( K 12 ),离氨酸 16 ( K 16 )并且在NH2终端尾巴的离氨酸 20 的 methylation ( K 20 )也在胰岛素, Arg-C , Glu-C 和糜蛋白酶文摘的 LC-MS/MS 分析以后被识别。
The post translational modifications of histone variants are playing an important role in the structure of chromatin, the regulation of gene activities and the diagnosis of diseases, and conducting in-depth researches and discovering new sites depend on new and rational analytical methods to some extent. In this work, the combinatorial method of high resolution LTQ-Orbitrap mass spectrometry and multiple enzymes was employed to identify the post translational modifications (PTMs) of histone H4 of human liver cells. The novel methylation site, argnine 67 (R 67), was observed besides some sites reported previously such as lysine 31 (K 31), lysine 44 (K 44), argnine 55 (R 55) and lysine 59 (K 59) in the global domain. Meanwhile, various combinations of acetylation of lysine 5 (K 5), lysine 8 (K 8), lysine 12 (K 12), lysine 16 (K 16) and methylation of lysine 20 (K 20) in the NH2-terminal tails were also identified after the LC-MS/MS analysis of trypsin, Arg-C, Glu-C and chymotrypsin digests.