Eukaryotic DNA ligases are ATP-dependent enzymes that catalyze the joining of single and double stranded DNA breaks, which is an essential step in DNA repair, replication and recombination. There are at least 4 DNA ligases, termed DNA ligase I-IV, have been cloned and characterized. DNA ligase-I is functionally homologous to the DNA ligase encoded by the S. cervisiae CDC9 gene. The joining of Okazaki fragments during lagging strand DNA replication is due to DNA ligase-I. DNA ligase-I (919 aa, chromosome 19q13.2-q13.3; mouse 916 aa, rat 919 aa) is a nuclear protein. Its deficiency causes immunodeficiency and cellular hypersensitivity of DNA-damaging agents.
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