一株海洋中性蛋白酶高产菌S-3685的鉴定及产酶条件  

Identification of a Marine Bacterium S-3685 with High Neutral Protease and Optimization of Its Fermentation Conditions

作　　者：马子宾 郑鸿飞[1] 刘均忠[1] 郝建华[1] 孙谧[1] 

机构地区：[1]农业部海洋渔业可持续发展重点实验室中国水产科学研究院黄海水产研究所,青岛266071 [2]上海海洋大学食品学院,上海201306

出　　处：《渔业科学进展》2015年第5期131-137,共7页Progress in Fishery Sciences

基　　金：国际科技合作与交流(2014DFG30890);国家自然科学基金(41376175);青岛市科技计划项目(14-2-4-11-jch)共同资助

摘　　要：通过生理生化、分子生物学、单因子优化等方法研究了来自南海海域一株产中性蛋白酶菌株S-3685,并对其在250 ml摇瓶中的培养条件进行了优化。结果显示,该菌株初步确定为芽孢杆菌属(Bacillus),发酵培养的最佳碳、氮源分别为葡萄糖10 g/L和豆面10 g/L,牛肉膏5 g/L,酵母膏5 g/L。无机盐Mg SO4·7H2O、Na2CO3、KH2PO4最佳浓度分别为0.2 g/L、2.0 g/L、1.0 g/L;菌株在培养基起始p H=7.0、4%接种量、15 ml/250 ml(v/v)装液量和30℃的条件下,发酵72 h获得较高的酶产量。在最佳培养条件下产酶量为4250 U/ml,是优化前的5倍。The S-3685 strain, a marine bacterium producing neutral protease, was screened from South China Sea. It was identified as aBacillussp. based on the morphology, the biochemical characteristics, and the 16S rDNA sequencing results. This strain was gram-positive, and the spore located in the middle had ellipse or columnar shapes. The bacterial colony was round, protuberance, and milk white on the agar culture-medium. The surface of the bacterial colony was smooth and moist （30℃, 24 h）. Over time the colony slightly shriveled bumps in the middle. The length was 2.4-3.2 microns. The strain grew under the pH 5.0-11.0, and could grow normally at the temperature 4-40℃. We then explored the fermentation conditions using a 250 ml shake flask. The optimum sources of carbon and nitrogen were glucose （10 g/L） and pulse flour （10 g/L） respectively, plus the beef extract （5 g/L） and the yeast extract （5 g/L）. The optimum concentrations of MgSO4·7H2O, Na2CO3and KH2PO4 were 0.2 g/L, 2.0 g/L and 1.0 g/L respectively. The optimum initial pH of the culture medium for the protease production was 7.0. The optimized culture conditions were： inoculums at 4%, broth content at 15 ml/250ml（v/v）, temperature at 30℃, and culture for 72 h. After the optimization, the productivity of protease was increased by 5 times （from 850 to 4250 U/ml）.

关 键 词：海洋微生物 中性蛋白酶 芽孢杆菌属 鉴定 培养条件优化 

分 类 号：Q939.9[生物学—微生物学]