相关实验视频
Updated: Jan 18, 2026

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Overexpressing and Purifying a Toxic Nuclease from Escherichia coli
Published on: August 29, 2025
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在Bacillus licheniformis 2709中的多功能核酶Nuc A的分泌表达
Huimin Guo1, Kefen Wang2, Tongtong Zhang3
1School of Optometry, Tianjin Vocational Institute.
The Journal of general and applied microbiology
|May 28, 2025
概括
研究人员通过优化基因表达来增强Bacillus licheniformis中的Serratia核酶 (Nuc A) 生产. 这导致了显著更高的产量和工业应用的特定活动.
科学领域:
- 生物技术是生物技术.
- 酶工程是什么? 酶工程是什么?
- 微生物发酵 微生物发酵
背景情况:
- 塞拉提亚核酶 (Nuc A) 是一个关键的酶,用于清除蛋白质净化中的核酸污染.
- 现有的生产方法需要在大型工业应用中进行改进.
- 细菌菌是适合异质蛋白质高水平分泌的宿主.
研究的目的:
- 优化Bacillus licheniformis中Serratia核酶 (Nuc A) 的分泌表达.
- 为了提高酶生产产量和工业用途的特定活动.
- 描述重组Nuc A. 的特性.
主要方法:
- 合成了Serratia核酶基因,并将其表达在Bacillus licheniformis 2709.
- 结合了成熟的Nuc A基因与强大的促进子 (PaprE) 和信号在各种遗传位置.
- 最大化了PaprE-nucA表达式磁带的副本数量,以增加产量.
主要成果:
- 在60小时的培养后,获得了Nuc A的高产量,约为31954U/mL.
- 再组合核酶的特异活性为1.58×107U/mg,比大肠杆菌表达的特异活性高9倍.
- 该酶在pH7-10之间表现出强大的催化活性,以及对SDS,PMSF,Triton X-100和尿素的耐药性.
结论:
- 在Bacillus licheniformis中优化基因表达策略显著提高了Nuc A的生产.
- 再组合Nuc A具有适用于大规模工业应用的有利特性.
- 这项研究提供了一种有效的解决方案,用于节省成本的Nuc A.生产.
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