产耐盐蛋白酶深海细菌的分离鉴定  

The Isolation and Identification of Deep-sea Bacteria That Produce Salt-tolerant Proteases

作　　者：赵谋明[1] 舒会[1] 崔春[1] 雷芬芬[1] 唐雪鹭[1] 

机构地区：[1]华南理工大学轻工与食品学院,广东广州510640

出　　处：《现代食品科技》2015年第3期50-54,共5页Modern Food Science and Technology

基　　金：深海微生物活性物质挖掘与其利用技术(2012AA092104);热带海洋微生物新型耐盐特异性蛋白酶的挖掘与应用(2013418018-7);广东省海洋经济创新发展区域示范专项(GD2012-D01-002)

摘　　要：本文采用高盐富集、复筛发酵及耐盐稳定性实验的方式,从深海海泥中筛选产耐盐蛋白酶的深海海洋细菌。从深海海洋微生物中共筛选出25株耐盐菌,在这25株菌株中有14株在酪蛋白平板上能产生较大的水解圈;通过发酵复筛及耐盐稳定性实验,筛选得到一株酶活性能高且耐盐稳定性好的菌株,将其编号为SWJSS3;对菌株SWJSS3进行16SrDNA的鉴定并初步研究了盐浓度对产酶情况和酶稳定性的影响。菌株SWJSS3在0-10%（m/V）的盐浓度条件下均能生长,在0-10%的盐浓度下,菌液OD600的吸光值范围为0.08-1.98;通过发酵复筛其所产生的蛋白酶酶活在盐浓度为1%时达最高,为233.56±2.16U/mL;所产蛋白酶在终浓度为15%（m/V）的NaCl溶液下,混匀4℃保存1h,残余酶活为初始酶活的40.70±2.06%,继续存放一段时间到第9h,酶活基本保持不变;通过16SrDNA鉴定其为铜绿假单胞菌,与PseudomonasaeruginosaRP2816SrDNA的相似性达到99%以上。This study was aimed at screening deep-sea bacteria that produce salt-tolerant proteases from deep-sea mud samples based onhigh-salt accumulation, fermentation rescreening, and salt-tolerant stability tests. Twenty-five strains of deep-sea marine microorganisms were selected, 14 of which demonstrated an increase inhydrolysis cycles on casein plates. A strain withhigh enzyme activity and salt stability was obtained based on fermentation rescreening and a salt-tolerance test, and was labeled as SWJSS3. Strain SWJSS3 was identified using 16S rDNA and a preliminary study on the effects of salt concentration on its protease yield and stability was conducted. The strain was able to grow in medium with salt concentrations between 0% and 10% and an OD600 of the bacterial suspension ranging from 0.08 to 1.98. The activity of proteases produced by SWJSS3 was maximal for a 1% salt concentration in the fermentation rescreening（233.56 ± 2U/mL）. After treatment with 15%（final concentration） sodium chloride solution at 4 ℃ for 1h, the enzyme activity decreased to 40.70 ± 2.06% of the initial enzyme activity, but remained stable for up to 9h. strain SWJSS3 was identified as Pseudomonas aeruginosa, exhibiting 99% 16S rDNA sequence similarity to P. aeruginosa RP28.

关 键 词：深海海洋细菌 蛋白酶 耐盐稳定性 分离鉴定 

分 类 号：Q93[生物学—微生物学]