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• W2039632938 abstract "Posttranslational histone modifications play an important role in regulating chromatin based nuclear processes including transcription. Of these modifications, histone ubiquitination is among the least understood. Histone ubiquitination predominately targets histones H2A and H2B. While ubiquitination of H2B is evolutionarily conserved from budding yeast to mammals, ubiquitination of H2A has not been detected in budding yeast, worms, or plants. Until recently, studies of histone ubiquitination lagged far behind the study of other histone modifications, largely because antibodies specific for ubiquitinated histones are difficult to generate. Despite this obstacle, the identification of the enzymatic machineries involved in histone ubiquitination, together with the successful use of a combination of genetic and immunoblot approaches to detect ubiquitinated histones, have helped to reveal important regulatory roles for this modification in transcriptional initiation and elongation, cell cycle progression, and DNA damage response. With the aid of the recently developed ubiquitinated histone-specific antibodies, an intriguing link between histone ubiquitination and cancer development has been established. While the enzymes involved in H2B ubiquitination were identified first in budding yeast and subsequently in higher organisms based on gene homology, the identification of the enzymatic machineries involved in H2A ubiquitination largely depended on a biochemical purification approach. The unbiased search for ubiquitin ligases targeting histones also led to the identification of a H3 and H4 ubiquitin ligase. Here we detail a protocol for the biochemical approach to identify histone ubiquitin ligase(s) from HeLa cells. Similar approaches have been successfully used to identify histone methyltransferases, histone demethylases, chromatin remodeling factors, and general transcription factors. So long as an in vitro enzymatic assay can be established, the approach we describe can be easily adapted to identify other histone and non-histone modifying enzymes." @default.
• W2039632938 created "2016-06-24" @default.
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• W2039632938 date "2011-07-01" @default.
• W2039632938 modified "2023-09-25" @default.
• W2039632938 title "Purification of histone ubiquitin ligases from HeLa cells" @default.
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• W2039632938 doi "https://doi.org/10.1016/j.ymeth.2011.03.003" @default.
• W2039632938 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3119374" @default.
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