Full Text:   <3929>

CLC number: Q81

On-line Access: 2024-08-27

Received: 2023-10-17

Revision Accepted: 2024-05-08

Crosschecked: 2009-03-04

Cited: 23

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Citations:  Bibtex RefMan EndNote GB/T7714

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Journal of Zhejiang University SCIENCE B 2009 Vol.10 No.4 P.264-272

http://doi.org/10.1631/jzus.B0820341


Purification and characterization of a novel antifungal protein from Bacillus subtilis strain B29


Author(s):  Jing LI, Qian YANG, Li-hua ZHAO, Shu-mei ZHANG, Yu-xia WANG, Xiao-yu ZHAO

Affiliation(s):  Department of Life Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; more

Corresponding email(s):   yangq@hit.edu.cn

Key Words:  Bacillus subtilis, Antifungal protein, Purification



Abstract: 
An antifungal protein was isolated from a culture of Bacillus subtilis strain B29. The isolation procedure comprised ion exchange chromatography on diethylaminoethyl (DEAE)-52 cellulose and gel filtration chromatography on Bio-Gel® P-100. The protein was absorbed on DEAE-cellulose and Bio-Gel® P-100. The purified antifungal fraction was designated as B29I, with a molecular mass of 42.3 kDa by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), pI value 5.69 by isoelectric focusing (IEF)-PAGE, and 97.81% purity by high performance liquid chromatography (HPLC). B29I exhibited inhibitory activity on mycelial growth in Fusarium oxysporum, Rhizoctonia solani, Fusarium moniliforme, and Sclerotinia sclerotiorum. The 50% inhibitory concentrations (IC50) of its antifungal activity toward Fusarium oxysporum and Rhizoctonia solani were 45 and 112 μmol/L, respectively. B29I also demonstrated an inhibitory effect on conidial spore germination of Fusarium oxysporum and suppression of germ-tube elongation, and induced distortion, tumescence, and rupture of a portion of the germinated spores.

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