Enzyme Commission Number - Top Level Codes

Top Level Codes

Top-level EC numbers
Group Reaction catalyzed Typical reaction Enzyme example(s) with trivial name
EC 1
Oxidoreductases		 To catalyze oxidation/reduction reactions; transfer of H and O atoms or electrons from one substance to another AH + B → A + BH
A + O → AO 		Dehydrogenase, oxidase
EC 2
Transferases		 Transfer of a functional group from one substance to another. The group may be methyl-, acyl-, amino- or phosphate group AB + C → A + BC Transaminase, kinase
EC 3
Hydrolases		 Formation of two products from a substrate by hydrolysis AB + H2O → AOH + BH Lipase, amylase, peptidase
EC 4
Lyases		 Non-hydrolytic addition or removal of groups from substrates. C-C, C-N, C-O or C-S bonds may be cleaved RCOCOOH → RCOH + CO2 or → Decarboxylase
EC 5
Isomerases		 Intramolecule rearrangement, i.e. isomerization changes within a single molecule AB → BA Isomerase, mutase
EC 6
Ligases		 Join together two molecules by synthesis of new C-O, C-S, C-N or C-C bonds with simultaneous breakdown of ATP X + Y+ ATP → XY + ADP + Pi Synthetase

Read more about this topic:  Enzyme Commission Number

Famous quotes containing the words top, level and/or codes:

    “She might have been old once and now, miraculously, young again—but with the memory of that other life intact. She seemed to know the world down there in the dark hall and beyond for what it was. Yet knowing, she still longed to leave this safe, sunlit place at the top of the house for the challenge there.”
    —Paule Marshall (b. 1929)

    “I love thee to the level of everyday’s
    Most quiet need, by sun and candle-light.
    I love thee freely, as men strive for Right;
    I love thee purely, as they turn from Praise.
    I love thee with the passion put to use
    In my old griefs, and with my childhood’s faith.”
    —Elizabeth Barrett Browning (1806–1861)

    “Thou hast a voice, great Mountain, to repeal
    Large codes of fraud and woe; not understood
    By all, but which the wise, and great, and good
    Interpret, or make felt, or deeply feel.”
    —Percy Bysshe Shelley (1792–1822)