African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12254

Full Length Research Paper

Temporal profiles of intra- and extracellular laccase isoenzymes from Pleurotus ostreatus produced in submerged and solid-state cultures

Anahí Armas-Tizapantzi
  • Anahí Armas-Tizapantzi
  • Posgrado en Ciencias Biológicas, Centro Tlaxcala de Biología de la Conducta, Universidad Autónoma de Tlaxcala, Carr, Tlaxcala-Puebla Km. 1.5, 90062, Tlaxcala, México.
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Elizet Cuatecontzi-Cuautle
  • Elizet Cuatecontzi-Cuautle
  • Posgrado en Ciencias Biológicas, Centro Tlaxcala de Biología de la Conducta, Universidad Autónoma de Tlaxcala, Carr, Tlaxcala-Puebla Km. 1.5, 90062, Tlaxcala, México.
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Francisco J. Fernández
  • Francisco J. Fernández
  • Departamento de Biotecnología, CBS, Universidad Autónoma Metropolitana-Iztapalapa, Avda, San Rafael Atlixco #186 Colonia Vicentina, Delegación Iztapalapa, 09340 México D.F., México.
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Arturo Estrada-Torres
  • Arturo Estrada-Torres
  • Centro de Investigación en Ciencias Biológicas, Universidad Autónoma de Tlaxcala, Aut. San Martín Texmelucan-Tlaxcala Km 10.5, San Felipe Ixtacuixtla, 90120, Tlaxcala, México.
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Alba Mónica Montiel-González*
  • Alba Mónica Montiel-González*
  • Centro de Investigación en Ciencias Biológicas, Universidad Autónoma de Tlaxcala, Aut. San Martín Texmelucan-Tlaxcala Km 10.5, San Felipe Ixtacuixtla, 90120, Tlaxcala, México.
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  •  Received: 20 November 2015
  •  Accepted: 09 May 2016
  •  Published: 01 June 2016

Abstract

Laccases are enzymes that have a great potential for use in breaking down toxic compounds. Fungal laccases show high enzymatic activity, especially those produced by basidiomycetes. Depending on the culture conditions and the strain used, a variety of isoenzymes and/or enzymatic activities can be obtained. In this study, extracellular laccase enzymes produced by Pleurotus ostreatus was identified in a submerged culture (SmF), with and without copper sulphate as a chemical inducer, and in a solid-state culture (SSF), using wheat straw as natural inducer. This study was conducted to observe the expression of the enzymes produced under the culture conditions tested and their persistence during the culture, as well as the extracellular activity produced and the correspondence that the isoenzymes presented between the intracellular and extracellular media. A positive effect of the inducers on the specific laccase activity was observed either in SmF with copper sulphate or SSF (41.11 and 40.43 UI/mg protein, respectively), compared with that obtained in SmF without copper sulphate (2.87 UI/mg protein). This effect was different only at the time when the highest activity appeared (360 and 120 h, respectively), showing advantages in SSF. The same three isoenzymes were observed in the three kinds of cultures. The main differences among the laccase profiles reside in the time when they appeared in each culture and only an additional form of lower molecular weight was observed in SSF. The laccase enzymes in the intracellular extracts were equal to those in the extracellular ones. The laccase isoenzymes profiles suggest that the presence of inducers helps in maintaining the activity through the culture time.

Key words: Phenol oxidases, basidiomycete, enzymatic activity, copper, wheat straw, solid-state culture (SSF), submerged culture (SMF).