Ligases

Ligases (EC 6.-.-.-) form a major class of enzymes that catalyze the ligation (i.e. linking together) of two molecules with concomitant hydrolysis of the pyrophosphate bond in adenosine 5'-triphosphate (ATP) or a similar triphosphate, forming C–C , C–O , C–S , P–O or C–N bonds[1]. Originally, biochemical nomenclature distinguished synthetases and synthases. Under the original definition, synthases do not use energy from nucleoside triphosphates (such as ATP, GTP, CTP, TTP, and UTP), whereas synthetases do use nucleoside triphosphates. It is also said that a synthase is a lyase (a lyase is an enzyme that catalyzes the breaking of various chemical bonds by means other than hydrolysis and oxidation, often forming a new double bond or a new ring structure) and does not require any energy, whereas a synthetase is a ligase (a ligase is an enzyme that binds two chemicals or compounds) and thus requires energy. However, the Joint Commission on Biochemical Nomenclature (JCBN) dictates that "synthase" can be used with any enzyme that catalyses synthesis (whether or not it uses nucleoside triphosphates), whereas "synthetase" is to be used synonymously.


[1] A. D. McNaught, A. Wilkinson. IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Blackwell Scientific Publications,Oxford (1997).

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Axon ID Name Description From price
3108 BC-LI-0186 Specific inhibitor of the LRS-RagD interaction €90.00
2549 L67 Cytotoxic inhibitor of DNA ligase I and III €90.00
1705 REP 3123 dihydrochloride MetRS inhibitor €125.00
1704 REP 8839 MetRS inhibitor €125.00
2531 SCR7 pyrazine DNA ligase IV mediated inhibitor of NHEJ €65.00

5 Item(s)

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