Abstract
Histones are proteins which help to organize DNA. The way in which they function is complex and is partially controlled by post-translational modifications (PTMs). Histone proteins from numerous organisms can be recombinantly produced in bacteria, but many bacterial strains are incapable of installing the variety of PTMs that histones possess. An alternative method of producing histones, which can be used to introduce PTMs, is native chemical ligation (NCL). This chapter provides a general NCL protocol which can be used to produce synthetic, post-translationally modified, histone proteins. The focus is on the NCL procedure itself and not on producing the modified histone protein fragments as there are many different ways in which these can be synthesized, depending on the modification(s) required. The same NCL protocol is also applicable for expressed protein ligation (EPL) with only small modifications to the purification procedure potentially required.
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