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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
immunology and microbiology
L-Methioninase production by filamentous fungi: I-screening and optimization under submerged conditions
Current Microbiology, Volume 58, No. 3, Year 2009
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Description
Findings show 21 fungal isolates belonging to eight genera recovered from Egyptian soils that have the potential to attack l-methionine under submerged conditions. Aspergillus flavipes had the most methioninolytic activity, giving the highest yield of l-methioninase (10.78 U/mg protein), rate of methionine uptake (93.0%), and growth rate (5.0 g/l), followed by Scopulariopsis brevicaulis and A. carneus. The maximum l-methioninase productivity (11.60 U/mg protein) by A. flavipes was observed using l-methionine (0.8%) as an enzyme-inductive agent and glucose (1%) as a co-dissimilated carbon source. A significant reduction in l-methioninase biosynthesis by A. flavipes was detected using carbon-free medium, suggesting the lack of ability to use l-methionine as a carbon and nitrogen source. Potassium dihydrogen phosphate (0.25%), the best source of phosphorus, favors enzyme biosynthesis and enhances the level of methionine uptake by A. flavipes. The maximum l-methioninase productivity (12.58 U/mg protein) and substrate uptake (95.6%) were measured at an initial pH of 7.0. © 2008 Springer Science+Business Media, LLC.
Authors & Co-Authors
Khalaf, Salwa Abdelmageed
Egypt, Zagazig
Faculty of Science
El-Sayed, Ashraf S. A.
Egypt, Zagazig
Faculty of Science
Japan, Kyoto
Kyoto Institute of Technology
Statistics
Citations: 46
Authors: 2
Affiliations: 2
Identifiers
Doi:
10.1007/s00284-008-9311-9
ISSN:
03438651
e-ISSN:
14320991
Research Areas
Environmental
Study Design
Exploratory Study
Study Approach
Qualitative