Promoter engineering for high ectoine production in a lower saline medium by Halomonas hydrothermalis Y2
Promoter engineering for high ectoine production in a lower saline medium by Halomonas hydrothermalis Y2
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热液盐单胞菌 Y2 在低盐培养基中高产四氢嘧啶的启动子工程
DOI:
10.1007/s10529-021-03084-3
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发表时间:
2021-01
影响因子:
2.7
通讯作者:
Chunyu Yang
中科院分区:
文献类型:
--
作者:
Shannan Li;Yan Shang;Qi Zhao;Yuanxiang Liu;Xueqian Dong;Wenkai Wang;Chunyu Yang
Objectives:For the stress from fermenters, downstream processing equipment, and wastewater treatment to be alleviated, lowering salt-dependence in the ectoine synthesis process is of great significance in the moderately halotolerant Halomonas hydrothermalis Y2.Results:In H. hydrothermalis Y2, the σ70- and σ38-controlled promoters of ectA are predicted to be involved in the osmotic regulation of ectoine synthesis. By substituting the ectA promoter with a promoter P265that identified in the outer membrane pore protein E of H. hydrothermalis Y2, the salt dependence of ectoine synthesis was significantly decreased. In the 500-ml flask containing various NaCl contents, the engineered strain (p/Y2/△ectD/△doeA) showed a remarkably enhanced ability in ectoine synthesis, especially under lower saline stress. After a 36-h fed-batch fermentation in the 1-l fermenter, p/Y2/△ectD/△doeA synthesized 11.5 g ectoine l-1in the presence of 60 g NaCl-1l, with a high 0.32 g ectoine l-1h-1productivity, a specific productivity of 512.2 mg ectoine per g cell dry weight (CDW)-1, and an excretion ratio of 67 % ectoine.Conclusions:As no impaired growth was observed in strain p/Y2/△ectD/△doeA while ectoine synthesis was increased, this promoter engineering strategy provides a practical protocol for lowering the salt-dependence of ectoine synthesis in this moderately halotolerant strain.
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影响因子:
5.1
作者:
Schwibbert K;Marin-Sanguino A;Bagyan I;Heidrich G;Lentzen G;Seitz H;Rampp M;Schuster SC;Klenk HP;Pfeiffer F;Oesterhelt D;Kunte HJ
通讯作者:
Kunte HJ
影响因子:
16
作者:
Lee, SJ;Gralla, JD
通讯作者:
Gralla, JD
影响因子:
4.7
作者:
Li, Tingting;Li, Teng;Ouyang, Qi
通讯作者:
Ouyang, Qi
影响因子:
3.3
作者:
M. Salvador;M. Argandoña;J. Pastor;V. Bernal;M. Cánovas;L. Csonka;J. J. Nieto-J.;C. Vargas
通讯作者:
M. Salvador;M. Argandoña;J. Pastor;V. Bernal;M. Cánovas;L. Csonka;J. J. Nieto-J.;C. Vargas
影响因子:
4.4
作者:
Czech, Laura;Poehl, Sebastian;Bremer, Erhard
通讯作者:
Bremer, Erhard