Degradation of cellulose by the major endoglucanase produced from the brown-rot fungus Fomitopsis pinicola
An endoglucanase that is able to degrade both crystalline and amorphous cellulose was purified from the culture filtrates of the brown-rot fungus Fomitopsis pinicola grown on cellulose. An apparent molecular weight of the purified enzyme was ∼32 kDa by SDS-PAGE analysis. The enzyme was purified 11-fold with a specific activity of 944 U/mg protein against CMC. The partial amino acid sequences of the purified endoglucanase had high homology with endo-β-1,4-glucanase of glycosyl hydrolase family 5 from other fungi. The K m and K cat values for CMC were 12 mg CMC/ml and 670/s, respectively. The purified EG hydrolyzed both cellotetraose (G4) and cellopentaose (G5), but did not degrade either cellobiose (G2) or cellotriose (G3).
KeywordsBrown-rot fungus Cellulose Endoglucanase Fomitopsis pinicola Microcrystalline cellulose hydrolysis
This study was carried out with the support of Forest Science & Technology Projects (Project No. S210707L010110) provided by the Korea Forest Service. The authors would like to thank Miss N.-M. Kim for her support and technical help.
- Highley TL (1975) Properties of cellulases of two brown-rot and two white-rot fungi. Wood Fiber 6:275–281Google Scholar
- Ritschkoff AC (1996) Decay mechanisms of brown-rot fungi. VTT Publications 268, EspooGoogle Scholar
- Yamanobe T, Mitsuishi Y, Yagisawa M (1988) Purification and some properties of a microcrystalline cellulose-hydrolyzing enzyme (Avicelase II) from fungal strain Y-94. Agric Biol Chem 52:2493–2524Google Scholar