《中国畜牧兽医》 ›› 2017, Vol. 44 ›› Issue (3): 920-927.doi: 10.16431/j.cnki.1671-7236.2017.03.041

• 基础兽医 • 上一篇    下一篇

一株产角蛋白酶的铜绿假单胞菌的分离鉴定

黄妙容1, 钟楚红2, 任广彩1, 刘传高2, 叶俊贤2, 陈瑞爱1,2   

  1. 1. 农业部动物疫病防控生物技术与制品创制重点实验室, 肇庆 526238;
    2. 华南农业大学兽医学院, 广州 510642
  • 收稿日期:2016-07-21 出版日期:2017-03-20 发布日期:2017-03-21
  • 通讯作者: 陈瑞爱 E-mail:chensa727@126.com
  • 作者简介:黄妙容(1983-),女,广东潮州人,博士,研究方向:兽用生物制品,E-mail:miaorongh@foxmail.com;钟楚红(1992-),女,江西赣州人,硕士,研究方向:临床兽医学,E-mail:582042249@qq.com
  • 基金资助:

    大华农公司科研基金

Isolation and Identification of A Keratinase-producing Strain of Pseudomonas aeruginosa B1-2

HUANG Miao-rong1, ZHONG Chu-hong2, REN Guang-cai1, LIU Chuan-gao2, YE Jun-xian2, CHEN Rui-ai1,2   

  1. 1. Key Laboratory of Biotechnology and Drug Manufacture for Animal Epidemic Prevention, Ministry of Agriculture, Zhaoqing 526238, China;
    2. College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
  • Received:2016-07-21 Online:2017-03-20 Published:2017-03-21

摘要:

本研究从鸡场长期堆放羽毛的土壤中筛选到一株降解羽毛能力强的菌株。该菌株在牛奶平板上培养24 h后产生透明降解圈,形状不规则,表面粗糙,边缘模糊,产生绿色荧光色素;革兰氏染色阴性,短杆状,无芽孢,有鞭毛,无荚膜。生化试验显示,该分离株能够水解牛奶、明胶,具有角蛋白酶活性,能利用柠檬酸盐,硝酸还原反应阳性。系统进化树分析显示,分离株与铜绿假单胞菌模式菌株(GenBank登录号:BAMA01000316)亲缘关系最近,综合以上结果,最终确定分离株为铜绿假单胞菌,并正式命名为Pesudomonas aeruginosa B1-2。将该分离株在以1%羽毛为唯一碳氮源的基础培养基中发酵培养,48 h后角蛋白酶活性最高达到60.3 U/mL,对羽毛降解率为85.7%。本研究中分离获得的Pesudomonas aeruginosa B1-2可用于畜禽废弃物的处理。

关键词: 分离鉴定; 生化试验; 角蛋白酶; 铜绿假单胞菌

Abstract:

A new feather-degrading bacterium was isolated from soil samples colected from pile-up feather places in this study.The transparent circle was produced after the strain was cultured on the milk medium for 24 h,the colony shape of the strain was irregular,rough surface,edge blur,and could produce green fluorescent pigment.It was gram negative,short rod,nospore and capsule and had a flagellum scanning by electron microscope. Biochemical test showed that the isolate could hydrolyze milk and gelatin,utilize citrate with keratinase activity and nitrate reduction reaction positive.Phylogenetic tree analysis showed that the isolate was most closely related to Pseudomonas aeruginosa strain (GenBank accession No.:BAMA01000316).Combined with the above results,the isolated strain was identified as Pseudomonas aeruginosa B1-2. When it was inoculated on basal medium containing 1% feather as sole carbon and nitrogen source,the highest level of keratinase activity was 60.3 U/mL after 48 h while the degradation rate of feather was 85.7%. This result indicated that the newly isolated Pseudomonas aeruginosa B1-2 could be useful in management of farm wastes.

Key words: isolation and identification; biochemical test; keratinase; Pseudomonas aeruginosa

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