中国对虾PC-Ⅲ系列抗菌肽的分离纯化及活性

以我国主要经济海产品中国对虾（Penus chinensis）为研究对象，通过Sephadex G-50、RP-HPLC等技术分离纯化到PC-Ⅲ系列中国对虾天然抗菌肽。经初步鉴定，该系列抗菌肽对革兰氏阴性和革兰氏阳性菌都表现出程度不一的抑菌活性，且不同程度地影响小白鼠离体回肠肌收缩，但无丝氨酸蛋白酶抑制剂活性。用MALDI-TOF质谱对样品进行分析，检测到分子量分别为1071Da和1311Da的两种抗菌肽。这些抗菌肽对对虾抵御微生物的侵袭具有重要的作用。

Antimicrobial Peptides Purified from Penus chinensis

Two antimicrobial peptides were purified from Penus chinensis by Sephadex G-50 gel filtration and reverse phase high performance liquid chromatography. The molecular weights were 1 071 and 1 311 Da respectively, determined by matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry. They inhibited the growth of Gram-positive and Gram-negative bacteria. The antimicrobial peptides strengthened the contractile response of isolated mice ileum. Serine proteases did not affect hydrolytic activities in our current experiments. These antimicrobial peptides play an important role in preventing microbial infection in P. chinensis.