文章摘要
引用本文:韩尧跃,林 娟,张建美,叶秀云.产琼脂糖酶海洋微生物的筛选鉴定及酶学性质研究[J].福州大学学报(自然科学版),2015,43(2):278~284
产琼脂糖酶海洋微生物的筛选鉴定及酶学性质研究
Isolation and identification of an agarase-producing marine microorganism and study on its enzymatic properties
  
DOI:10.7631/issn.1000-2243.2015.02.0278
中文关键词: 琼脂糖酶  海洋微生物  筛选鉴定  酶学性质  动力学参数
英文关键词: agarase  marine microorganism  isolation identification  enzymatic properties  kinetic parameters
基金项目:
作者单位
韩尧跃 福州大学生物科学与工程学院福建省海洋酶工程重点实验室福建 福州 350116 
林 娟 福州大学生物科学与工程学院福建省海洋酶工程重点实验室福建 福州 350116 
张建美 福州大学生物科学与工程学院福建省海洋酶工程重点实验室福建 福州 350116 
叶秀云 福州大学生物科学与工程学院福建省海洋酶工程重点实验室福建 福州 350116 
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中文摘要:
      从红藻中筛选获得一株能产生明显液化现象并具有较高琼脂糖酶活力的菌株Ag-1,经生理生化实验和16S rDNA序列分析鉴定为弧菌属(Vibrio sp.). 酶学性质研究表明,该酶的最适反应温度为50 ℃,40~50 ℃水浴保温1 h可保持68%以上的酶活力;最适反应pH值为8.0,在pH 7.0~8.0保温1 h可保持90%以上的酶活力,在pH 8.0~9.0保温1 h仍可保持70%以上的酶活力,具有较好的耐热性和耐碱性;且该酶对琼脂底物具有高度专一性;K+、Ca2+、Mg2+、Li+和Fe3+对琼脂糖酶活力具有激活作用,Mn2+、Zn2+和Cu2+对琼脂糖酶具有抑制作用. 酶反应动力学实验结果表明,该酶的最适底物浓度为8 mg·mL-1,动力学参数Km为0.58 mg·mL-1vmax为3.29 U·mg-1.
英文摘要:
      A wide-type strain,with apparent liquefied phenomenon and high agarase activity was isolated from red-algae. The strain was identified as Vibrio sp. by its physiological and biochemical experiments,and sequence analysis of 16S rDNA. The optimum reaction temperature of the agarase was 50 ℃,and the agarase maintained more than 68% of its maximum activity after incubation for 1 h under 40~50 ℃. The optimum reaction pH of the agarase was 8.0,and the agarase retained more than 90% and 70% of its maximum activity after incubation for 1h at the pH range of 7.0~8.0 and 8.0~9.0,respectively. The enzyme had good heat and alkali resistance and high substrate specificity. Agarase was significantly activated by K+,Ca2+,Mg2+,Li+ and Fe3+ and strongly inhibited by Mn2+ ,Zn2+ and Cu2+. The results of the enzymatic reaction kinetics showed that the optimal concentration of substrate was 8 mg·mL-1,and the enzyme kinetic parameters Km and vmaxwere 0.58 mg·mL-1 and 3.29 U·mg-1,respectively.
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