alexa ChAP-MS: a method for identification of proteins and histone posttranslational modifications at a single genomic locus.
Bioinformatics & Systems Biology

Bioinformatics & Systems Biology

Journal of Proteomics & Bioinformatics

Author(s): Byrum SD, Raman A, Taverna SD, Tackett AJ

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Abstract The field of epigenomics has been transformed by chromatin immunoprecipitation approaches that provide for the localization of a defined protein or posttranslationally modified protein to specific chromosomal sites. While these approaches have helped us conceptualize epigenetic mechanisms, the field has been limited by the inability to define features such as the proteome and histone modifications at a specific genomic locus in an unbiased manner. We developed an unbiased approach whereby a unique native genomic locus was isolated, which was followed by high-resolution proteomic identification of specifically associated proteins and histone posttranslational modifications. This chromatin affinity purification with mass spectrometry (ChAP-MS) technique was used to specifically enrich a ~1,000 base pair section of GAL1 chromatin under transcriptionally active and repressive conditions, as well as to identify the specifically bound proteins and histone posttranslational modifications. ChAP-MS should yield insight into the regulatory mechanisms of transcription and help identify factors that epigenetically control chromatin function. Copyright © 2012 The Authors. Published by Elsevier Inc. All rights reserved.
This article was published in Cell Rep and referenced in Journal of Proteomics & Bioinformatics

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