在有氧条件下使用重组SUF系统合成 [4Fe-4S] 蛋白质
Po-Hsiang Wang1,2, Shota Nishikawa3,4, Shawn Erin McGlynn3,5
1Department of Chemical Engineering and Materials Engineering, National Central University, Taoyuan 32001, Taiwan.
ACS synthetic biology
|July 19, 2023
概括
研究人员开发了一种新方法,在无细胞系统中生产活性铁硫 (Fe-S) 蛋白质. 这一突破使必要的 [4Fe-4S] 蛋白质的有氧合成成为可能,进步了合成生物学和生物催化.
科学领域:
- 生物化学 生物化学
- 合成生物学 合成生物学
- 蛋白质工程是指蛋白质工程.
背景情况:
- 铁硫 (Fe-S) 集群对于生物系统中的电子转移至关重要.
- 由于组装需求,氧气敏感性和净化挑战, [4Fe-4S] 蛋白质的异质表达是困难的.
- PURE系统为蛋白质合成提供了一个无细胞平台,但需要适应Fe-S集群的纳入.
研究的目的:
- 在有氧条件下在PURE系统中表达成熟的 [4Fe-4S] 蛋白质,建立一个简单有效的协议.
- 为了克服在无细胞合成过程中与Fe-S集群组装和氧气可变性相关的挑战.
- 为了证明系统的功能,使用模型蛋白质,如阿基尼酶和铁素.
主要方法:
- 在试验室中使用纯化的复合性SUF子单元 (SufABCDSE) 重建SUF系统.
- 将SUF辅助蛋白纳入PURE系统,以在缺氧条件下进行翻译合的 [4Fe-4S] 集群组装.
- 整合一个氧化清除酶级联 (格式脱酶,黄素还原酶,酶) 以维持无氧条件和再生辅助因子.
主要成果:
- 在有氧条件下成功开发了一种合成成熟的 [4Fe-4S] 蛋白质的一两步方案.
- 该系统使全-阿基尼酶的功能表达能够实现,最大度约为0.15 mg/mL.
- PURE系统成功地适应了对氧敏感Fe-S蛋白质的合成.
结论:
- 开发的协议提供了一种有效的方法,用于在无细胞环境中生产活性 [4Fe-4S] 蛋白质.
- 这一进步扩大了PURE系统对复杂蛋白质合成的实用性.
- 该方法对未来构建氧化还原活性合成细胞和改进的无细胞生物催化剂具有前景.
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