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Title: Properties of laccase isoenzymes produced by the basidiomycete Ceriporiopsis subvermispora

Source: Biotechnol. Appl. Biochem. 21, 323-333 [1995]

Author(s)Salas, Carlos; Lobos, Sergio; Larrain, Juan; Salas, Loreto; Cullen, Dan; Vicuna, Rafael

Publication Year: 1995  View PDF »

Category: Journal Articles

Abstract: Laccase is one of the ligninolytic enzymes found in liquid of the fungus Ceriporiopsis subvermispora in defined medium. As an approach to a clarification of the role of laccases during the attack on lignin by the fungus, the enzyme has been characterized further. The levels of this phenol oxidase increase 2-fold in the presence of p-anisidine and are severely affected when addition of either Mn(II) or Cu(II) ions to the medium is omitted. Isoelectrofocusing allowed the resolution of two laccase isoenzymes, with pIS of 3.65 and 3.59. In rich medium, laccase activity is 10-fold higher than in salt medium, and it is not affected by the external addition of p-anisidine or Four isoenzymes were detected in these cultures, with pIS between 3.76 and 3.60. In a wheat bran medium, four isoenzymes with pIS in the range 3.63-3.46, plus a fifth isoenzyme of high pI (4.82), were also identified. The absorption spectrum of a pool containing the four isoenzymes from rich medium shows a maximum at 600 nm, typical of laccase possessing a type I copper atom. The molecular mass of the isoenzyme with pI 3.60 is 79 kDa, as determined by SDS/PAGE. Upon treatment with endoglycosidase F, the molecular mass of this isoform decreases to 63 kDa, indicating a high degree of glycosylation. Substrate specificity studies conducted with the four isoenzymes from rich medium and a combination of isoenzymes from salt medium showed marked differences among them. The amino-terminal sequences (24 residues) of three isoenzymes isolated from rich medium were determined. Two of them are identical, whereas the third one differs from these in three amino acid residues. The consensus sequence reveals clear homology with laccases from other microorganisms.

Keywords: Fungi; genetics; laccase; enzymes; industrial applications; biodegradation; lignin; wood-decaying fungi; biotechnology; Basidiomycetes; fungal enzymes; manganese; copper; spectrum analysis; nucleotide sequence; oxidases; phenols; Ceriporiopsis subvermispora; wood decay; decay fungi; [rho]-anisidine

Publication Review Process: Informally Refereed (Peer-Reviewed)

File size: 274 kb(s)

Date posted: 02/09/2010

This publication is also viewable on Treesearch:  view
RITS Product ID: 33179
Current FPL Scientist associated with this product
Cullen, Daniel
Research Microbiologist

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