福建农业学报 ›› 2016, Vol. 31 ›› Issue (5): 449-454.doi: 10.19303/j.issn.1008-0384.2016.05.002

• 动物科学 • 上一篇    下一篇

鳗鲡肠道产蛋白酶菌株的筛选、鉴定及酶学性质研究

宋永康, 黄薇, 吕新, 任丽花   

  1. 福建省农业科学院农业质量标准与检测技术研究所/福建省精密仪器农业测试重点实验室, 福建 福州 350003
  • 收稿日期:2016-03-21 修回日期:2016-04-19 出版日期:2016-05-28 发布日期:2016-05-28
  • 作者简介:宋永康(1963-),男,副研究员,研究方向:水产养殖与饲料营养
  • 基金资助:

    福建省自然科学基金(2014J0101);福建省科技计划项目——省属公益类科研院所基本科研专项(2015R1025-8)

Protease-producing Bacterium Isolated from Intestines of Anguilla anguilla

SONG Yong-kang, HUANG Wei, LÜ Xin, REN Li-hua   

  1. Institute of Agricultural Quality Standards and Testing Technology Research, Fujian Academy of Agricultural Sciences/Fujian Key Laboratory of Measurement of Agricultural, Fuzhou, Fujian 350003, China
  • Received:2016-03-21 Revised:2016-04-19 Online:2016-05-28 Published:2016-05-28

摘要: 采用酪蛋白平板透明圈法,结合以鱼粉为底物的蛋白酶活力测定法,从欧洲鳗鲡肠道中分离筛选出1株高产蛋白酶的菌株MJ15。通过形态学观察、Biolog鉴定以及16S rRNA基因序列分析,该菌株鉴定为乳酸乳球菌乳酸亚种Lactococcus lactis subsp. Lactis。对菌株MJ15所产蛋白酶性质进行初步分析,结果显示,其最适作用温度和pH值分别为40℃和5.0,酶的热稳定性以及碱稳定性较差;K+、Na+、Cu2+、Fe2+对蛋白酶有激活作用,但Zn2+、Pepstatin A对该酶有抑制作用;该酶的Km值和Vmax值分别为8.77 mg·mL-1和53.48 μg·min-1·mL-1

关键词: 欧洲鳗鲡, 肠道细菌, 蛋白酶, 降解鱼粉

Abstract: A bacterial strain,MJ15, that secreted high amount of proteases was isolated on a casein plate culture from the intestines of Anguilla anguilla. Activity of the enzyme was determined by using a fishmeal as the substrate for the digestion. By means of morphological observations, biolog identification, and phylogenetic analysis on 16S rRNA sequences,MJ15 was identified as Lactococcus lactis subsp.The activity of the crude protease it secreted peaked at 40℃ and pH 5.0.The thermal and alikali stabilities of the protease were relatively poor. The metal ions, K+, Na+, Cu2+, and Fe2+, enhenced the enzymatic activity, while Zn2+ or pepstatin Aslightly inhibited it.The Kmand Vmaxof the enzyme were determined to be 8.77 mg·mL-1 and 53.48 μg·min-1·mL-1, respectively.

Key words: Anguilla anguilla, intestinal bacteria, protease, fishmeal degradation

中图分类号: 

  • Q936