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X-ray structural studies of the fungal laccase from Cerrena maxima.
- Source :
- Journal of Biological Inorganic Chemistry (JBIC); Dec2006, Vol. 11 Issue 8, p963-973, 11p, 4 Diagrams, 4 Charts
- Publication Year :
- 2006
-
Abstract
- Laccases are members of the blue multi-copper oxidase family. These enzymes oxidize substrate molecules by accepting electrons at a mononuclear copper centre and transferring them to a trinuclear centre. Dioxygen binds to the trinuclear centre and following the transfer of four electrons is reduced to two molecules of water. The X-ray structure of a laccase from Cerrena maxima has been elucidated at 1.9 Å resolution using synchrotron data and the molecular replacement technique. The final refinement coefficients are R <subscript>cryst</subscript> = 16.8% and R <subscript>free</subscript> = 23.0%, with root mean square deviations on bond lengths and bond angles of 0.015 Å and 1.51°, respectively. The type 1 copper centre has an isoleucine residue at the axial position and the “resting” state of the trinuclear centre comprises a single oxygen (OH) moiety asymmetrically disposed between the two type 3 copper ions and a water molecule attached to the type 2 ion. Several carbohydrate binding sites have been identified and the glycan chains appear to promote the formation of well-ordered crystals. Two tyrosine residues near the protein surface have been found in a nitrated state. [ABSTRACT FROM AUTHOR]
- Subjects :
- LACCASE
FUNGI
X-rays
MOLECULAR structure
OXIDOREDUCTASES
Subjects
Details
- Language :
- English
- ISSN :
- 09498257
- Volume :
- 11
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Journal of Biological Inorganic Chemistry (JBIC)
- Publication Type :
- Academic Journal
- Accession number :
- 23196323
- Full Text :
- https://doi.org/10.1007/s00775-006-0158-x