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. Author manuscript; available in PMC: 2016 May 26.
Published in final edited form as: Angew Chem Int Ed Engl. 2015 Apr 14;54(22):6457–6461. doi: 10.1002/anie.201500085

Figure 1.

Figure 1

A. Schematic of how chromatin with site-specific PTMs (green symbols) is conventionally assembled from protein semi-synthesis and recombinant expression, followed by DNA ligation. B. Illustration of the display of a histone peptide by a PNA targeting vector (red) which recognizes a specific DNA sequence, resulting in the surrogate of native chromatin used in this study. C. Structure of the PNA vector and the modified histone peptides. Aha = (S)- aminoheptanoic acid.