|本期目录/Table of Contents|

[1]刘标,陈薇,吴迎奔,等.嗜热角蛋白降解菌的分离筛选及降解特性[J].江苏农业科学,2022,50(13):226-231.
 Liu Biao,et al.Isolation, screening and degradation characteristics of thermophilic keratin-degrading bacteria[J].Jiangsu Agricultural Sciences,2022,50(13):226-231.
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《江苏农业科学》[ISSN:1002-1302/CN:32-1214/S]

卷:
第50卷
期数:
2022年第13期
页码:
226-231
栏目:
资源与环境
出版日期:
2022-07-05

文章信息/Info

Title:
Isolation, screening and degradation characteristics of thermophilic keratin-degrading bacteria
作者:
刘标 陈薇 吴迎奔 喻孟元 郭照辉 刘惠知 尹红梅
湖南省微生物研究院,湖南长沙 410009
Author(s):
Liu Biaoet al
关键词:
嗜热角蛋白降解菌副地衣芽孢杆菌角蛋白酶二硫键还原酶亚硫酸盐
Keywords:
-
分类号:
S182
DOI:
-
文献标志码:
A
摘要:
为获得高效降解羽毛角蛋白的嗜热微生物,提高微生物降解角蛋白的效率,利用以羽毛角蛋白为唯一碳氮源的培养基从堆肥样品中分离降解菌,并对其菌种分类、粗酶液的酶学性质及降解角蛋白机理进行研究。通过选择培养基共筛选到5株高温降解菌,其中,菌株K-7降解性能和生物安全性能最佳。结合菌株形态特征、生理生化特征及16S rDNA系统进化树分析,鉴定该菌株为副地衣芽孢杆菌(Bacillus paralicheniformis)。在含角蛋白底物培养基中,K-7 的发酵上清液可检测到较强的角蛋白酶活,但未检测到明显的二硫键还原酶活;同时,在降解过程中,产生了大量的亚硫酸盐和巯基化合物,表明亚硫酸盐裂解是角蛋白二硫键断裂的主要方式。酶学特性结果显示,粗酶液的最适反应温度为50~70 ℃,最适反应pH值为7.0~8.0,粗酶液在80 ℃以下时热稳定较好,SDS、PMSF和EDTA等化学试剂对酶活有较强的抑制作用,而DTT、β-巯基乙醇对酶活性有显著的增强作用。研究结果扩展了副地衣芽孢杆菌的应用领域,丰富了嗜热角蛋白降解菌的菌种资源库。
Abstract:
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备注/Memo

备注/Memo:
收稿日期:2021-08-24
基金项目:湖南省自然科学基金(编号:2020JJ5321);湖南省生猪产业技术体系规模养殖与环境控制岗位项目(编号:2020—2022);湖南省农用微生物应用工程技术研究中心建设项目。
作者简介:刘标(1986—),男,湖南浏阳人,硕士研究生,高级工程师,主要从事农业环境微生物基础与应用研究,E-mail:280795307@qq.com。
通信作者:尹红梅,硕士,副研究员,主要从事农业环境微生物基础应用研究。E-mail:66998902@qq.com。
更新日期/Last Update: 2022-07-05