PROPERTIES OF LACCASE ISOENZYMES PRODUCED BY THE BASIDIOMYCETE CERIPORIOPSIS-SUBVERMISPORA

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dc.contributor.authorSALAS, C
dc.contributor.authorLOBOS, S
dc.contributor.authorLARRAIN, J
dc.contributor.authorSALAS, L
dc.contributor.authorCULLEN, D
dc.contributor.authorVICUNA, R
dc.date.accessioned2025-01-21T01:34:43Z
dc.date.available2025-01-21T01:34:43Z
dc.date.issued1995
dc.description.abstractLaccase is one of the ligninolytic enzymes found in liquid cultures 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 Ran(II). 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 nn, 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.
dc.fuente.origenWOS
dc.identifier.issn0885-4513
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/97594
dc.identifier.wosidWOS:A1995RC59400008
dc.language.isoen
dc.pagina.final333
dc.pagina.inicio323
dc.revistaBiotechnology and applied biochemistry
dc.rightsacceso restringido
dc.subject.ods06 Clean Water and Sanitation
dc.subject.odspa06 Agua limpia y saneamiento
dc.titlePROPERTIES OF LACCASE ISOENZYMES PRODUCED BY THE BASIDIOMYCETE CERIPORIOPSIS-SUBVERMISPORA
dc.typeartículo
dc.volumen21
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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