Affiliation:
1. Microbiology Department-Faculty of Science Ain Shams University, Cairo, Egypt
2. Chemistry of Natural and Microbial Products Department, Pharmaceutical Industries Research Division, National Research Centre, 33 El Buhouth St. (Former El Tahrir St.), 12622, Dokki, Cairo, Egypt
Abstract
Objective:
L-Asparaginase is an important enzyme that converts L-asparagine to L-aspartate
and ammonia. Microbial L-asparaginase has important applications as anticancer and food processing
agents.
Methods:
This study reported the isolation, screening of a local yeast isolate from banana peel for
L-asparaginase production using submerged fermentation, optimization of the production, purification,
and anticancer assay of L-asparaginase. The yeast isolate was identified as Kodamaea ohmeri ANOMY
based on the analysis of nuclear large subunit (26S) rDNA partial sequences. It was a promising
L-asparaginase producer with a specific activity of 3059±193 U/mg in a non-optimized medium. The
classical one-variable-at-a-time method was used to optimize the production medium components, and
it was found that the elimination of K2HPO4 from the medium increased L-asparaginase specific activity
(3100.90±180 U/mg).
Results:
Statistical optimization of L-asparaginase production was done using Plackett-Burman and
Box-Behnken designs. The production medium for the maximum L-asparaginase specific activity
(8500±578U/mg) was as follows (g/L): L-asparagine (7.50), NaNO3 (0.50), MgSO4.7H2O (0.80), KCl
(0.80) associated with an incubation period of 5 days, inoculum size of 5.60 %, and pH (7.0). The optimization
process increased L-asparaginase production by 2.78-fold compared to the non-optimized
medium. L-Asparaginase was purified using ammonium sulphate precipitation followed by gel filtration
on a Sephadex G-100 column. Its molecular weight was 66 KDa by SDS-PAGE analysis.
Conclusion:
The cell morphology technique was used to evaluate the anticancer activity of
L-asparaginase against three different cell lines. L-Asparaginase inhibited the growth of HepG-2,
MCF-7, and HCT-116 cells at a concentration of 20, 50, and 60 μL, respectively.
Publisher
Bentham Science Publishers Ltd.
Subject
Pharmaceutical Science,Biotechnology
Cited by
7 articles.
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