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Purification and Biochemical Characterization of a Novel Thermostable Lichenase From Aspergillus Niger US368

Purification and Biochemical Characterization of a Novel Thermostable Lichenase From Aspergillus Niger US368

Fatma Elgharbi, Aïda Hmida-Sayari, Mouna Sahnoun, Radhouane Kammoun, Lobna Jlaeil, Hajer Hassairi, Samir Bejar

Carbohydr Polym. 2013 Oct 15;98(1):967-75.

PMID: 23987435

Abstract:

New β-1,3;1,4-glucanase was purified from Aspergillus niger US368. The pure glucanase has a molecular mass of about 32 kDa. The N-terminal sequence of the purified enzyme (A-G-T-N-P-P-I-G-V) was determined. The optimum pH and temperature recorded for enzyme activity were 5 and 60 °C, respectively. It also displayed marked thermostability with a half-life of 30 min at 70 °C. At 37 °C, the enzyme showed 100% stability from pH 3 to 10. The Km and Vmax values exhibited by the enzyme on barley β-glucan were 0.62 mg ml(-1) and 34.46 U ml(-1), respectively. The enzyme is a retaining-one and was only active toward glucan containing β-1,3;1,4-linkages. The production of β-glucanase with barley flour as the sole carbon source was optimized. This is the first report on the purification and characterization of a β-1,3;1,4-glucanase from A. niger. This lichenase could be considered as a candidate for future application particularly in the animal feed industry.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP9074980	β-Glucanase from Aspergillus niger		9074-98-0	Price

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