Abstract
Covalent histone modifications-referred to as the 'histone code', are recognized by a wealth of effector or 'reader' modules, representing one of the most fundamental epigenetic regulatory mechanisms that govern the structure and function of our genome. Recent progresses on combinatorial readout of such 'histone code' promote us to reconsider epigenetic regulation as a more complicated theme than we originally anticipated. In particular, plant homeodomain (PHD) fingers, which are evolved with fine-tuned residue composition and integrated or paired with other reader modules, display remarkably diverse 'readership' other than its founding-member target, histone H3 trimethylation on lysine 4 (H3K4me3). In this review, we detail the latest progresses of PHD finger research, especially from the perspective of structural biology, and highlight the versatile binding features and biological significance of PHD fingers.
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