Laccase
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(New page: == CotA laccase == CotA laccase belong to the multi-copper oxidase family. The multi-copper oxidases constitute a family of enzymes whose principal members are laccase (benzenediol oxyge...)
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Revision as of 15:10, 7 June 2010
CotA laccase
CotA laccase belong to the multi-copper oxidase family. The multi-copper oxidases constitute a family of enzymes whose principal members are laccase (benzenediol oxygen oxidoreductase, EC 1.10.3.2), ascorbate oxidase (L-ascorbate oxygen oxidoreductase, EC 1.10.3.3) and ceruloplasmin (Fe(II) oxygen oxidoreductase, EC 1.16.3.1). Similar to the other laccases the three dimensional struture of CotA comprises three cupredoxin domain and four copper ions organised in two copper centers: a mononuclear blue type 1 copper centre and a trinuclear centre.
The trinuclear centre has two type 3 copper ions, that can be anti-ferromagnetically coupled through an hydroxyl moiety in between them, and one type 2 copper ion.‡ The mononuclear copper is able to accept an electron froma variety of phenolic substrates and then transmits it to the trinuclear centre.
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