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International Journal of Medicinal Mushrooms

ISSN for PRINT: 1521-9437

Institutional price:	$538.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2002, Volume4

106 pages

Issue price - $128.00

Physiological Regulation of Edible and Medicinal Higher Basidiomycetes Lignocellulolytic Enzyme Activity

Vladimir Elisashvili
Durmishidze Institute of Biochemistry and Biotechnology, Academy of Science of Georgia, 10 km Agmashenebeli kheivani, 0159 Tbilisi, Georgia

Eva Kachlishvili
Durmishidze Institute of Biochemistry and Biotechnology, Academy of Science of Georgia, 10 km Agmashenebeli kheivani, 0159 Tbilisi, Georgia

Tamar Khardziani
Durmishidze Institute of Biochemistry and Biotechnology, Academy of Science of Georgia, 10 km Agmashenebeli kheivani, 0159 Tbilisi, Georgia

Nino Tsiklauri
Institute of Biochemistry and Biotechnology, Academy of Science of Georgia, 380059 Tbilisi, Georgia

Mzia Bakradze
Institute of Biochemistry and Biotechnology, Academy of Science of Georgia, 380059 Tbilisi, Georgia

ABSTRACT

The biosynthesis of cellulases and xylanases in all white-rot higher Basidiomycetes is inducible by addition of cellulose as a carbon source. The characteristic feature of brown-rot fungi is constitutive synthesis of enzymes even in the presence of glucose as carbon source. However, cellulases and xylanases of Piptoporus betulinus are inducible enzymes in the presence of cellobiose as the sole carbon source. Catabolite repression of cellulase and xylanase synthesis in the presence of an easily metabolizable carbon source is widespread in all fungi with inducible enzymes synthesis. The role of an easily metabolizable carbon source in regulation of laccase production is established. The use of cellobiose instead of avicel as a carbon source results in a 20-fold increase of Cerrena unicolor laccase activity. Mannitol was the best carbon source for Pleurotus ostreatus and Phlebia radiata, whereas xylan ensured the highest laccase activity of Coriolus pubescens. Addition of 2,5-xylidine enhanced laccase production 4- to 10-fold by Cerrena unicolor, Coriolus pubescens, Panus tigrinus, and Pleurotus ostreatus.