KMID : 0880220130510030359
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Journal of Microbiology 2013 Volume.51 No. 3 p.359 ~ p.366
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Identification and characterization of an anti-fungi Fusarium oxysporum f. sp. cucumerium protease from the Bacillus subtilis strain N7
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Yi Luo
Lifei Sun Zhen Zhu Wei Ran Qirong Shen
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Abstract
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A newly discovered alkaline antifungal protease named P6 from Bacillus subtilis N7 was purified and partially characterized. B. subtilis N7 culture filtrates were purified by 30?60% (NH4)2SO4 precipitation, anion-exchange chromatography and gel filtration chromatography. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) revealed a single band of 41.38 kDa. Peptide sequence of protease P6 was determined using a 4800 Plus MALDI TOF/TOF¢â Analyzer System. Self-Formed Adaptor PCR (SEFA-PCR) was used to amplify the 1,149 bp open read frame of P6. Dimensional structure prediction using Automatic Modeling Mode software showed that the protease P6 consisted of two ¥â-barrel domains. Purified P6 strongly inhibited spore and mycelium growth of Fusarium oxysporum f. sp. cucumerium (FOC) by causing hypha lysis when the concentration was 25 ¥ìg/ml. Characterization of the purified protease indicated that it had substrate specificity for gelatin and was highly active at pH 8.0?10.6 and 70¡ÆC. The P6 protease was inhibited by EDTA (2 mmol/L), phenyl methyl sulfonyl fluoride (PMSF, 1 mmol/L), Na+, Fe3+, Cu2+, Mg2+ (5 mmol/L each) and H2O2 (2%, v/v). However, protease activity was activated by Ca2+, K+, Mn2+ (5 mmol/L each), mercaptoethanol (2%, v/v) and Tween 80 (1%, v/v). In additon, activity was also affected by organic solvents such as acetone, normal butanol and ethanol, but not hexane (25%, v/v each).
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KEYWORD
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purification, characterization, Bacillus subtilis, anti-fungal protease, self-formed adaptor PCR
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