Proteinase K

The broad-spectrum serine protease with a relative molecular weight of approximately 29.3 kDa cleaves the carboxy-terminal peptide bonds of aliphatic and aromatic amino acids. Proteinase K is widely applied to enzymatic glycated hemoglobin reagents and glycated albumin reagents research, also a key reagent for nucleic acid extraction which enzymatically  hydrolyze histones bound to nucleic acids to free DNA for subsequent  purification.