Abstract
The present study characterized extracellular carboxymethyl cellulase (CMCase), an enzyme
catalyzes the hydrolysis of the cellulose, from Trichoderma asperellum PQ34 that was isolated from
agricultural cultivation soil in Thua Thien Hue, Vietnam.
Methods: CMCase was produced by culturing T. asperellum PQ34 on Czapek-Dox medium supplemented with
carboxymethyl cellulose (CMC) at 28ºC for 96 h at a shaking speed of 150 rpm. Enzyme activity was
spectrophotometerically determined with CMC used as a substrate and the absorbance was measured at 540
nm. The molecular weight of CMCase was determined by zymogram based on sodium dodecyl sulfatepolyacrylamide gel electrophoresis with 0.2% CMC.
Results: CMCase achieved the highest activity after 4 days of culture with the optimal pH and temperature at 4
and 55°C. The enzyme maintains pH and thermal stability in the range of 4-5 and 10-40C and the relative
activity of both is more than 90%. The presence of metal ions at 5 mM such as Ca2+, Al3+, or Co2+ increased the
enzyme activity up to 133%, 124%, and 217%, respectively. CMCase was stable with 1 mM
ethylenediaminetetraacetic acid and 1 M urea, but inhibited by 5% sodium dodecyl sulfate (SDS) and 5% TritonX100. Zymographic analysis showed that CMCase from T. asperellum PQ34 consists of two enzymes with a
molecular weight of about 31 and 66 kDa.
Conclusion: CMCases from T. asperellum PQ34 exhibited characteristics of an acidic and thermostable enzyme.
The interaction of Co2+ and CMCase resulted in a significant increase in enzyme activity, however they were
strongly inhibited by 5% SDS.
Nguyen Hoang Loc, Nguyen Hong Van, Hoang Tan Quang. (2020-2021) Characterization of carboxymethyl cellulase produced by Trichoderma asperellum, Advancements in Life Sciences, Volume-8, Issue-1.
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