ligase

/luy"gays, -gayz/, n. Biochem.
any of a class of enzymes that catalyze the joining of two molecules by formation of a covalent bond accompanied by the hydrolysis of ATP.
[1961; < L lig(are) to tie, bind + -ASE]

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also called  Synthetase 

      any one of a class of about 50 enzymes that catalyze reactions involving the conservation of chemical energy and provide a couple between energy-demanding synthetic processes and energy-yielding breakdown reactions. They catalyze the joining of two molecules, deriving the needed energy from the cleavage of an energy-rich phosphate bond (in many cases, by the simultaneous conversion of adenosine triphosphate [ATP] to adenosine diphosphate [ADP]). A ligase catalyzing the formation of a carbon-oxygen bond between an amino acid and transfer RNA is called amino acid–RNA ligase. Carbon–nitrogen (C−N) bonds are formed by the action of such enzymes as amide synthetases and peptide synthetases.

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Universalium. 2010.

Look at other dictionaries:

  • ligase — [ ligaz ] n. f. • 1981; mot angl.; cf. ligand ♦ Biochim. Enzyme permettant l union de deux molécules avec rupture d une liaison à haut potentiel énergétique. A. D. N. ligase : enzyme catalysant l union de deux fragments d A. D. N. ● ligase nom… …   Encyclopédie Universelle

  • ligase — n. (Biochem.) An enzyme which catalyzes creation of a covalent bond between two substrates, resulting in a larger product which is a combination of the two starting materials; especially, {DNA ligase}, an enzyme which creates a phosphate bond… …   The Collaborative International Dictionary of English

  • ligase — [lī′gās΄, lī′gāz΄] n. any of a class of enzymes that act as catalysts in chemical reactions in which molecules are linked together, as in the synthesis and repair of DNA or in the formation of recombinant DNA …   English World dictionary

  • Ligase — In biochemistry, a ligase (from the Latin verb ligāre mdash; to bind or to glue together ) is an enzyme that can catalyse the joining of the sugar phosphate backbones of Okazaki fragments of DNA. Generally ligase catalyses the following reaction …   Wikipedia

  • Ligase — En biochimie, une ligase est une enzyme qui catalyse la jonction de deux molécules (en anglais ligation) par de nouvelles liaisons covalentes avec hydrolyse concomitante de l ATP ou d autres molécules similaires. Nomenclature le nom courant des… …   Wikipédia en Français

  • Ligase — Ligasen (v. lat. ligare verbinden , verketten ) sind Enzyme, die das Verknüpfen zweier Moleküle durch eine chemische Bindung katalysieren. Dazu benötigen sie Energie, die aus der Spaltung energiereicher Nukleosidtriphosphate (NTP) stammt. Dabei… …   Deutsch Wikipedia

  • ligase — ligazė statusas T sritis chemija apibrėžtis Fermentas, katalizuojantis kondensacijos (sintezės) reakcijas dalyvaujant didžiaenergiams junginiams. atitikmenys: angl. ligase; synthetase rus. лигаза; синтетаза ryšiai: sinonimas – sintetazė …   Chemijos terminų aiškinamasis žodynas

  • ligase — ligazė statusas T sritis augalininkystė apibrėžtis Fermentas, katalizuojantis sintezės reakcijas, dalyvaujant didžiaenergiams junginiams. atitikmenys: angl. ligase; synthetase rus. лигаза; синтетаза …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • ligase — See: DNA ligase …   Glossary of Biotechnology

  • ligase — noun Etymology: International Scientific Vocabulary lig (from Latin ligare) + ase Date: 1961 synthetase …   New Collegiate Dictionary

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