DEVELOPMENT OF TECHNOLOGIES FOR RESOLUTION AND STRUCTURAL DELINEATION OF INTACT

这个子项目是许多研究子项目中利用 资源由NIH/NCRR资助的中心拨款提供。子项目和 调查员(PI)可能从NIH的另一个来源获得了主要资金， 并因此可以在其他清晰的条目中表示。列出的机构是 该中心不一定是调查人员的机构。 组蛋白翻译后修饰包括可逆乙酰化和磷酸化、甲基化、泛素化和核糖化，这些修饰在多个位点具有不同的化学计量比。人们认为，特定氨基酸残基的某些修饰模式编码了一种语言，参与管理染色质许多功能的蛋白质可以阅读这种语言。要破译这样的编码，需要完整描述每个异构体和变体的所有翻译后修饰，以及它们作为细胞状态函数的时间变化。这一挑战需要发展质量平衡，以便明确地描述每种特定异构体的翻译后状态。可以设想，这两种FTM与解离策略一起是必不可少的，例如电子俘获解离或可能的IR激活以及独立。消化和多肽序列，以填补模板中的任何空白，可从完整的蛋白质解离获得。还可以设想，均相完整异构体的分离将必须通过基于从混合物中准确选择单个分子量的质谱学策略来分离。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Histone posttranslational modifications include reversible acetylation and phosphorylation, methylation, ubiquitinylation and ribosylation with varying stoichiometry at multiple sites. It is thought that certain patterns of modifications at specific amino acid residues encode a language that is read by proteins involved in management of chromatin's many functions. To decipher such a code will require the complete delineation of all posttranslational modifications of each isoform and variant as well as their temporal changes as a function of cell state. This challenge requires development of mass balance for unambiguous delineation of posttranslational status for each particular isoform. It is envisaged that both FTMS together with a dissociation strategy is essential, such as electron capture dissociation or possibly IR activation as well as independent. Digestion and peptide sequence to fill in any gaps in the template derivable from intact Protein dissociation. It is also envisaged that separation of homogenous intact isoforms will have to be separated by mass spectral strategies based on accurate selection of individual molecular weights from mixtures.