Purification of a specific native genomic locus for proteomic analysis.

Purification of a specific native genomic locus for proteomic analysis.
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DOI:
10.1093/nar/gkt822
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发表时间:
2013-11
影响因子:
14.9
通讯作者:
Tackett AJ
Tackett AJ
中科院分区:
生物学2区
文献类型:
--
作者:
Byrum SD;Taverna SD;Tackett AJ

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在这里,我们描述了一种方法来分离天然染色质部分,而无需基因组工程相关蛋白质和组蛋白翻译后修饰的无标记蛋白质组学鉴定。设计了一种转录激活因子样(TAL)蛋白A融合蛋白,以识别酵母GAL 1启动子中的一个独特位点。TAL-PrA融合使染色质亲和纯化(ChAP)的一小部分天然染色质上游的GAL 1基因座,允许质谱(MS)鉴定的蛋白质和组蛋白的翻译后修饰调节半乳糖诱导的转录。这种TAL-ChAP-MS方法允许对特定的天然基因组位点进行生物化学分离以用于蛋白质组学研究,并将为调节位点特异性染色体代谢的蛋白质和表观遗传机制提供前所未有的客观见解。
Here, we describe an approach to isolate native chromatin sections without genomic engineering for label-free proteomic identification of associated proteins and histone post-translational modifications. A transcription activator-like (TAL) protein A fusion protein was designed to recognize a unique site in the yeast GAL1 promoter. The TAL-PrA fusion enabled chromatin affinity purification (ChAP) of a small section of native chromatin upstream from the GAL1 locus, permitting mass spectrometric (MS) identification of proteins and histone post-translational modifications regulating galactose-induced transcription. This TAL-ChAP-MS approach allows the biochemical isolation of a specific native genomic locus for proteomic studies and will provide for unprecedented objective insight into protein and epigenetic mechanisms regulating site-specific chromosome metabolism.
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