Nucleases are considered as molecular scissors, which catalyze the cleavage of phosphodiester bonds between the sugars and the phosphate moieties of nucleic acids. They play important role in DNA proofreading during replication, base, DNA repair, homologous recombination, and DNA/RNA turnover. The majority of nucleases are classified as hydrolases (this grouping) though a few endonucleases are classed as lyases. (Adapted from
PMID:20854710 and
PMID:12483517).