کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6491729 | 43436 | 2013 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High-level expression of glutaryl-7-aminocephalosporanic acid acylase from Pseudomonas diminuta NK703 in Escherichia coli by combined optimization strategies
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this work, a glutaryl-7-aminocephalosporanic acid acylase (GLA) coding gene was cloned from Pseudomonas diminuta NK703 which was screened from oilfield. The concerted effects of the expression system, inducing condition and culture medium on the expression of NK703 GLA in E. coli were firstly investigated. The best combination was the recombinant E. coli strain of pET-28a + GLA/BL21(DE3) with 2.0% (w/v) lactose inducing in YT medium at 25 °C. Then, by optimizing the components of culture medium, a synthetic medium with dextrin and a feeding medium with glycerol as the carbon sources were developed to further enhance the GLA yield and improve the GLA solubility. In the end, the NK703 GLA activity increased about 50-fold, reached 14,470 ± 465 U/L, and the GLA productivity and the proportion of soluble GLA to the total soluble protein attained 206.0 ± 9.033 U Lâ1 hâ1 and 60.13%, respectively. Scaling up the GLA production in 3.7 L fermenter under the optimized conditions identified in shake flask, the GLA activity also reached 12,406 ± 521 U/L, which was the highest report at fermenter level.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Biotechnology - Volume 168, Issue 4, December 2013, Pages 607-615
Journal: Journal of Biotechnology - Volume 168, Issue 4, December 2013, Pages 607-615
نویسندگان
Xiaoqiang Ma, Erzheng Su, Ying Zhu, Senwen Deng, Dongzhi Wei,