蛋白酶产生菌的筛选和紫外诱变育种

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2011 年 21( 1)
生物技术
ຫໍສະໝຸດ Baidu
73
此,不同地域或同 一 地 域 的 不 同 菌 株 之 间 其 交 配 因 子 基 因 的 复等位基因数量与地理差距的大小极有可能成正比。与茶树 菇杂交结果也出 现 上 述 现 象 但 不 出 菇,在 同 一 属 不 同 种 之 间 交配因子基因的复等位基因的多少随地理差距大小的关系有 待进一步研究。
蛋白酶产生菌的筛选和紫外诱变育种
蔡婉玲,田宝玉* ,郭菁,蓝灿华,黄薇,黄建忠*
( 福建师范大学 工业微生物教育部工程研究中心,福建 福州 350108) 摘要: 目的: 筛选水产品加工用蛋白酶产生菌,为酶的的分子改造和水产品加工提供材料基础。方法: 通过在富含水产品蛋 白的场所的针对性采样,菌落平板筛选结合发酵上清液平板验证以及 Folin - 酚试剂定量检测确认筛选结果,并通过紫外诱变提 高产中性蛋白酶菌株的产酶能力。结果: 从 12 份土样中分离 187 株具有明显蛋白酶活性的单菌落。在挑取的 11 株透明圈明显 的蛋白酶产生菌中,菌株 W9 在所有菌株中可以稳定产生较高的蛋白酶酶活力,约为 1 594U / ml。通过对其进行紫外诱变后,在 突变株中筛选得到一株酶活约为 1 845U / ml 的 W9UV 突变株,比野生菌株酶活提高了 15. 6% 。结论: 突变菌株 W9UV 可稳定产 生较高的蛋白酶酶活力,发酵性能优良。 关键词: 筛选; 蛋白加工; 中性蛋白酶; 酶活; 紫外诱变
( Engineering Research Center of Industrial Microbiology,Ministry of Education,Fujian Normal University,Fuzhou 350108,China)
Abstract: Objective: To obtain high and well defined protease - producing strains. These strains can be used in seafood process to produce poly - peptide. Method: The protease - producing strains were first screen from soil by well - designed sampling sites and colony screening,fermentation supernatant identification and Folin - phenol measurement assay etc. To improve the production of protease capability for the target strain,UV mutagenesis were further introduced. Result: 187 protease - production strains were screened from the collected 12 soil samples. Further secondary screening indicated a strain W9 produced stably higher enzyme activity than any other strains among the primary screened 11 strains. The activity of strain W9 reached to 1 594U / ml. Mutant strain W9UV was obtained by UV mutagenesis which enhances the protease activity by 15. 6% in comparison with that of the wild strain W9,with the activity of 1845 U / ml. Conclusion: W9UV strain has a greater protease activity and more stably fermentation performance. Key words: screen; seafood process; neutral protease; enzyme activity; UV mutagenesis
中图分类号: Q503; Q959. 17 文献标识码: A doi: 10. 3969 / j. issn. 1004 - 311X. 2011. 01. 026
Screening and UV Mutagenesis of Protease Producing Strains
CAI Wan - ling,TIAN Bao - yu* ,GUO Jing,LAN Can - hua,HUANG Wei,HUANG Jian - zhong*
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