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KMID : 0545120110210070711
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Journal of Microbiology and Biotechnology
2011 Volume.21 No. 7 p.711 ~ p.718
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Characterization of Cellobiohydrolase from a Newly Isolated Strain of Agaricus arvencis
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Lee Kyung-Min
Moon Hee-Jung
Dayanand Kalyani
Kim Hoon
Kim In-Won
Marimuthu Jeya
Lee Jung-Kul
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Abstract
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A highly efficient cellobiohydrolase (CBH)-secreting basidiomycetous fungus, Agaricus arvensis KMJ623, was isolated and identified based on its morphological features and sequence analysis of internal transcribed spacer rDNA. An extracellular CBH was purified to homogeneity from A. arvencis culture supernatant using sequential chromatography. The relative molecular mass of A. arvencis CBH was determined to be 65 kDa by SDSPAGE and 130 kDa by size-exclusion chromatography, indicating that the enzyme is a dimer. A. arvencis CBH showed a catalytic efficiency (kcat/Km) of 31.8 mM-1 s-1 for p-nitrophenyl-β-D-cellobioside, the highest level seen for CBH-producing microorganisms. Its internal amino acid sequences showed significant homology with CBHs from glycoside hydrolase family 7. Although CBHs have been purified and characterized from other sources, A. arvencis CBH is distinguished from other CBHs by its high catalytic efficiency.
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KEYWORD
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catalytic efficiency, cellobiohydrolase, enzyme production, Agaricus arvencis, glycoside hydrolase
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