In the context of catalysis, histone modifications are mediated by enzymes that act as catalysts. These enzymes include histone acetyltransferases (HATs), histone deacetylases (HDACs), histone methyltransferases (HMTs), and histone demethylases. These enzymes catalyze the addition or removal of specific functional groups to histone proteins, influencing chromatin structure and gene activity.
