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Isolation and characterization of an antifungal peptide with antiproliferative activity from seeds of Phaseolus vulgaris cv. ‘Spotted Bean’

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Abstract

A 7.3-kDa antifungal peptide with an N-terminal sequence exhibiting remarkable homology to defensins from other leguminous plants was isolated from Phaseolus vulgaris cv. ‘Spotted Bean’. The isolation procedure involved ion exchange chromatography on O-diethylaminoethyl (DEAE) cellulose, affinity chromatography on Affi-gel blue gel, ion exchange chromatography on SP-Sepharose, and gel filtration by fast protein liquid chromatography on Superdex 75. The peptide was unadsorbed on DEAE-cellulose and adsorbed on Affi-gel blue gel and SP-Sepharose. It exerted an antifungal action on Fusarium oxysporum and Mycosphaerella arachidicola. It inhibited mycelial growth in F. oxysporum with an IC50 value of 1.8 μM. It suppressed [methyl-3H]-thymidine incorporation by leukemia L1210 cells and MBL2 cells with an IC50 value of 4.0 and 9.0 μM, respectively. There was no effect on HIV-1 reverse transcriptase activity when the peptide was tested up to 0.1 mM.

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The excellent secretarial assistance of Ms. Fion Yung is appreciated.

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Correspondence to T. B. Ng.

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Wang, H.X., Ng, T.B. Isolation and characterization of an antifungal peptide with antiproliferative activity from seeds of Phaseolus vulgaris cv. ‘Spotted Bean’. Appl Microbiol Biotechnol 74, 125–130 (2007). https://doi.org/10.1007/s00253-006-0650-9

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  • DOI: https://doi.org/10.1007/s00253-006-0650-9

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