目的:鉴定大鲵皮肤分泌液中抗菌肽,研究其部分生物活性.方法:5%醋酸浸提和Sephadex G-50、G-25凝胶过滤色谱等方法分离纯化抗菌肤;采用抑菌圈法检测抗菌活性,Tricine-SDS-PAGE电泳和等电聚焦电泳鉴定其抗菌活性成份.结果:大鲵皮肤分泌液中舍有抗菌活性物质.对革兰阴性菌、革兰阳性菌和真菌均具有较强的抗菌活性;电泳检测显示该小分子多肽相对分子质量约为4300,具有较强的碱性.结论:首次从大鲵皮肤分泌液中分离纯化到一种抗菌肽,此抗菌肽可能是一个具有较强阳离子特征的碱性肽.%Purpose To characterize the antimicrobial peptides from the skin secretions of the Andrias davidianus and to study its bioactivity. Methods This antimicrobial peptide was purified by 5％ acetic acid extraction and Sephadex G-50, G-25 gel filtration chromatography. The antimicrobial ability was characterized by inhibiting zone determination. The antimicrobial active substance was identified by tricineSDS-PAGE electrophoresis and isoelectric focusing(IEF) electrophoresis. Results The skin secretions of the Andrias davidianus contain antibiotic active substance. It strongly inhibited Gram-negative, Gram-positive bacteria and fungus. The electrophoresis results showed that its molecular weight was about 4 300 with a strong alkaline property. Conclusion An antibacterial peptide was isolated from the skin secretions of the Andrias davidianus for the first time and this antimicrobial peptide may be a strong feature of the basic peptide cation.
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