The multicopper oxidases catalyze the reduction of oxygen to water, using a broad variety of substrates. They share a similar set of copper centers the type 1 (T1) or "blue copper" site..
Laccase from Trametes hirsuta
The laccase from trametes hirsuta has a single polypeptide chain with 3
colored green, blue, and yellow. The copper ions are represented by maroon spheres. Adding the
to the Cu ions shows that they come from different domains. The ligands of the T1 Cu ion (His-395 and 458 and Cys-453) all come from the yellow domain 3. The ligands of one T3 Cu ion come from the yellow domain 3 (His-400 and 452) and the blue domain 1(His 111). The ligands of the other T3 Cu ion also come from the yellow and blue domains 3 and 1, but two (His-66 and 109) come from the blue domain 1 and only one from the yellow domain 3 (His-454). The ligands of the T2 Cu ion come from the blue domain 1 (His 64) and yellow domain 3 (His-398) and in addition there are three water molecules, one in the center of the TNC, one bridging the T3 Cu ions, and one just associated with the T2 Cu ion. None of the ligands come from the blue domain 2, the middle of the sequence.
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Structural highlights
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