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Wei sheng wu xue bao = Acta microbiologica Sinica 2007-Dec

[Isolation of endophytic antagonistic bacterium from Amorphophallus konjac and research on its antibacterial metabolite].

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Ying Zhou
Lin Chen
Xin-Li Chai
Zi-Niu Yu
Ming Sun

Nøgleord

Abstrakt

An endophytic antagonistic bacterium was isolated from Amorphophallus konjac calli. In order to identify this bacterium, 16S rDNA was amplified and partially sequenced. Sequence comparison showed that this sequence has the highest similarity to that in Bacillus subtilis, with 99.0% identities. That demonstrated this bacterium belongs to Bacillus subtili , named BSn5. The extracted extracellular protein from strain BSn5 had antibacterial activity against Erwinia carotovora subp. carotovora, which was unstable after heated, sensitive to proteinase K and resistant to trypsin. There was only a 31.6kDa protein component as by SDS-PAGE detection. Nondenaturing polyacrylaminde gel was used to purify this protein. The purified 31.6kDa protein exhibited inhibitory activity against Erwinia carotovora subp. carotovora. This protein is different from all known metabolites from Bacillus subtilis, suggesting that it may be a novel antibacterial protein.

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