Abstract
To accompany the Focus on Chromatin appearing in this issue of Nature Structural & Molecular Biology, a series of primers has been specially prepared that covers the wealth of knowledge in four areas of chromatin research. These areas include functions associated with covalent histone modifications, the enzymes that mediate these modifications, modules that recognize chromatin, and the ATP-dependent chromatin-remodeling complexes. In such a complex field, the information has inevitably been somewhat simplified. As an example, the correlation between modifications and functions are often context dependent. For instance, H3K9 methylation has been associated with transcriptional activation when present in the coding region of the gene, but has also been associated with repression. The reference list provides further reading and details, as do the Reviews and Perspective in this issue. Although there are many informative structures in this field, space constraints allowed only representative structures to be shown, followed by reference citations for related structures ('3D REF' column). The primers can be used as a stand-alone resource--feel free to tear them out of the issue or print out the PDF versions and modify or add to them yourself as new data emerge. The online versions of the primers contain hyperlinks to the Protein Data Bank as well as 3D view links that allow structural visualization.
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