染色质组装相关因子的分离、纯化及染色质为模板hsp90α基因热诱导转录的研究
[Abstract]:Aim: eukaryotic genomic DNA contained in chromatin is the basic unit of chromatin which is formed around histone octamer. In addition to packaging DNA, chromatin can effectively "turn on / off" DNA and induce or suppress the binding of activator to DNA by adjusting its structure, that is, histone covalent modification and ATP-dependent chromatin remodeling complex. In order to promote or inhibit gene expression. Many covalent modifications of core histone tail include acetylation phosphorylation methylation ubiquification and so on which are involved in the activation and inhibition of gene regulation and formation of histone code as an important epigenetic marker. We have established a chromatin assembly system in vitro, which provides the basis for a better study of protein modification and the interaction between various modifications on the regulation of gene transcription. During chromatin assembly, (H3 / H4) 2 tetramer first binds to DNA, then H2A / H2B heterodimer binds to (H3 / H4) 2 binding site to form nucleosome on (H3 / H4) 2 binding site. Many molecular chaperones are involved in nucleosome formation, most of them are binding proteins of core histone, such as nucleosome assembly protein 1 (nucleosome assembly protein-1 (NAP-1), which can preferentially bind to histone H2A and H2B to facilitate the binding of histone to (nucleosome assembly. Therefore, we extracted and purified the core histone from HeLa cells, expressed it in insect expression system, extracted the chromatin assembly related factor (NAP-1), and provided an effective method for further study on the regulation mechanism of gene expression on chromatin template.
【学位授予单位】:河北医科大学
【学位级别】:硕士
【学位授予年份】:2005
【分类号】:R346
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