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Examples of CH···O hydrogen bonds (orange dashes) in molecular recognition and enzyme catalysis. A, recognition of trimethyllysine by CH···O hydrogen bonds in the ATRX ADD domain (41). B, schematic depiction of 234-TMT (upper) and 345-TMT (lower) binding to an engineered protein active site (54). C, conserved serine hydrolase CH···O hydrogen bond between the catalytic histidine and serine residues (17).
