DNA ligase

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 [li´gās, lig´ās]
any of a class of enzymes that catalyze the joining together of two molecules coupled with the breakdown of a pyrophosphate bond in ATP or a similar triphosphate.
DNA ligase either of two enzymes that join two double-helical molecules of DNA together to make a longer DNA molecule.
ligase chain reaction a type of DNA amplification that uses DNA ligase to link chains and amplify the template containing the sequence in question.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

DNA li·gase

an enzyme that leads to the formation of a phosphodiester bond at a break of one strand in duplex DNA; a part of the DNA repair system.
Farlex Partner Medical Dictionary © Farlex 2012

DNA ligase

an enzyme that catalyses the formation of covalent bonds between adjacent parts of a broken DNA POLYNUCLEOTIDE CHAIN. In this way a PHOSPHODIESTER BOND is formed between a 3'-OH group of one part of the chain and a 5'-PO4 group of the adjacent part. DNA ligase has a role in DNA replication and DNA REPAIR. It is also used in the formation of recombinant DNA molecules in GENETIC ENGINEERING.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
They will hybridize next to each other and form a substrate for DNA ligase activity only when a perfect match occurs, and are particularly sensitive to disruption from any mismatch near the nick--like a single nucleotide polymorphism (SNP).
Jackson, "Mammalian DNA double-strand break repair protein XRCC4 interacts with DNA ligase IV"' Current Biology, vol.
(1997) Mammalian DNA double-strand break repair protein XRCC4 interacts with DNA ligase IV.
Hura et al., "A flexible interface between DNA ligase and PCNA supports conformational switching and efficient ligation of DNA," Molecular Cell, vol.
The total volume of the LDR reaction system was 10 [micro]l including 1 [micro]l 10 x Buffer, 1 [micro]l primer and probe mixture (0.5 pM/each), 0.05 [micro]l (40 U/[micro]l) ligase (Taq DNA ligase enzyme system), 1 [micro]l PCR product (100 ng/[micro]l), and 6.95 [micro]l deionized water.
The kit combines TurboLigase[TM], an ultrapure recombinant T4 DNA Ligase, and 5x TurboLigation buffer, an optimized quick ligation buffer.
The amplified gene of cellulase was purified from the agarose gel after electrophoresis using Qiagen gel extraction kit and ligated into the pTZ57R/T cloning vector (Fermentas) using DNA ligase and ligation buffer.
LDR reactions were carried out in a volume of 20 [micro]L containing 20 mmol/L Tris-HCl (pH 7.6), 10 mmol/L Mg[Cl.sub.2], 100 mmol/L KCl, 10 mmol/l DTT, 1 mmol/L EDTA, 1 mmol/L NAD+, 12.5 mmol/L each probe, 3[micro]L of PCR product, and 0.1 mmol/L DNA ligase. The LDR was performed in a PE 9600 thermal cycler by incubating at 95[degrees]C for 2 min and cycling for 30 cycles at 95oC for 30 s and 65[degrees]C for 4 min.
Descriptively, the hOGG1 gene on chromosome 3p26 catalyzes the cleavage of a glycosylic bond between the modified base and a sugar moiety, leaving an abasic apurinic/apyrimidinic site in DNA which is then incised followed by a few successive actions of a phosphodiesterase that completes the repair process with a final function by a DNA polymerase, and a DNA ligase (7,8).
Note exquisite sensitivity in cell strains derived from DNA damage sensing- or repair-deficient cells derived from patients with abnormal ATM, NBS1 and DNA ligase IV proteins.
In the blunt end, a DNA ligase will join together the 3' end and the 5' end of one molecule with the 5' end and the 3' end, respectively, of another molecule.