摘要
拮抗菌枯草芽孢杆菌( Bacillus subtilis)TG26 分泌产生的小肽经两次盐酸沉淀、丙酮分级沉淀和Hipore 反相柱两次纯化,分离得到一种新的抗真菌的小肽,命名为LP1 。经MALDITOF质谱鉴定,分子量为1057-3 ,等电聚焦测得其pI为4-75 。LP1 对温度有较高的稳定性,100 ℃保温30min ,仍能保持75 % 的活性。抑菌谱表明,该抗菌肽对瓜果腐霉( Pythiu m aphanidermatu m) 、玉蜀黍赤霉病菌( Gibberella zeae) 、长柄链格孢( Alternarialongipe) 和番茄蔫萎座镰孢霉( Fusariu m oxysporum f.lycopersici) 等植物病原真菌有很强的抑制作用。LP1 可造成绿色木霉( Trichoderma viride) 菌丝生长形态异常:菌丝端部膨大,菌丝扭曲,分支加剧,菌丝内细胞质分布不均匀,发生凝聚。茚三酮反应以及测序结果均证实其为环肽。
An antifungalpeptide LP 1 from Bacillussubtilis TG26 strain was purified by acid pre cipitation,acetone precipitation and Hi porereversed phase column chromatography.The molecular weightof LP 1is1057.3 Dasdetermined by MALDI TOFmassspectrometry,andits pIis 4 .75 by PAG IEF.It wasalsofound to bethermostable.Its antifungalspectrum showed that LP 1 has stronginhibitory activity against many plant pathogenicfungi,such as Pythium aphanidermatum ,Gibberella zeae,Alternaria longipe,Fusarium oxysporum f.lycopersici,etc.. The abnormal hy phalgrowth of Trichoderma viridecaused by LP 1 such asswollentips,twisted,shortgrowth and cytoplasm condensation wasalsoobserved.Both ninhydrinreaction and peptidesequencingsuggested that LP 1is acyclic peptide.
出处
《微生物学报》
CAS
CSCD
北大核心
1999年第5期441-447,共7页
Acta Microbiologica Sinica
基金
北京大学预研基金
关键词
枯草芽孢杆菌
抗菌肽
抑菌谱
环肽
Bacillussubtilis TG 26 ,Antifungalpeptide,Antifungalspectrum ,Cyclic peptide