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ligases

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ligases
[lī′gāsəz]
Etymology: L, ligare + Fr, diastase, enzyme
a group of enzymes that catalyze the formation of a bond between substrate molecules coupled with the breakdown of a pyrophosphate bond in ATP or a similar donor molecule. Examples of ligases include the synthetase enzymes.


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The lack of measurable effects of PM on DNA strand breaks may be due to the very rapid repair by ligases, whereas guanine oxidation is repaired relatively slowly by base excision followed by strand nicking, insertion of nucleotide(s) in the gap, and rejoining by ligases (Hoeijmakers 2001; Risom et al.
These include restriction endonucleases for cleaving DNA and ligases for joining the fragments, recombinases that can execute a large variety of DNA cleavage and joining reactions.
D-Ala-D-Ala ligases from glycopeptide antibiotic-producing organisms are highly homologous to the enterococcal vancomycin-resistance ligases VanA and VanB.
 
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