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Characterization of a new efficient low molecular weight Bacillus subtilis NRC levansucrase and its levan. | LitMetric

Characterization of a new efficient low molecular weight Bacillus subtilis NRC levansucrase and its levan.

J Basic Microbiol

Department of Chemistry of Natural and Microbial Products, Pharmaceutical and drug Industry Division, National Research Centre, Giza, Egypt.

Published: October 2019

AI Article Synopsis

Article Abstract

Screening of 18 bacterial honey isolates revealed that all the isolates were levansucrase producers. The most potent isolate that achieved the highest activity (45.66 U/ml) was identified as Bacillus subtilis NRC based on morphological examination and 16S rRNA. The results recorded the necessity of starch (5 g/L), baker's yeast (12.5 g/L), and AlCl (5 mM) in improvement of the enzyme productivity. The Bacillus subtilis levansucrase was eluted as a single protein in one purification step. The enzyme molecular weight was (14 kDa). It showed its optimum activity at 45°C and could retain 60% of its activity after incubation at 50°C for 2 h. Its optimum activity was obtained at pH 8.2 and the enzyme showed great pH stability in both acidic and alkaline ranges. Unlike, most levansucrases all tested metals had an adverse effect in enzyme activity. The enzyme had antioxidant activities and were characterized as spherical micro- and nanoparticles by transmission electron microscopy. The effect of growth conditions and medium composition in levan structure and its fibrinolytic activity was evaluated.

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Source
http://dx.doi.org/10.1002/jobm.201900170DOI Listing

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