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代谢工程使大肠杆菌能够在1,3-propanediol上生长

Nga Yu Poon^1,2, Anthony J Sinskey³, Kang Zhou^1,2

¹Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore.

Synthetic and systems biotechnology

|January 15, 2026

概括

工程化大肠杆菌菌株PA16有效消耗1,3-二醇 (1,3-PDO),一种塑料副产品. 这种菌株利用氨酸作为关键营养素,为塑料废物再循环和可持续化学品生产铺平了道路.

科学领域:

生物技术是生物技术.
微生物工程微生物工程
合成生物学合成生物学

背景情况:

1,3-二醇 (1,3-PDO) 是塑料中的关键成分,需要废物利用技术.
之前的工作确立了一种能够代谢1,3-PDO同化中的中间体马隆酸半化物 (MSA) 的菌株 (BA07Δ).
开发微生物菌株以有效利用塑料衍生化学品对于循环经济至关重要.

研究的目的:

构建一种新的大肠杆菌菌株 (PA16),能够有效地利用1,3-propanediol (1,3-PDO) 作为碳来源.
增强1,3-PDO同化代谢途径,并确定改善生长的关键遗传因素.
为PA16种植建立一个简化和定义的媒介,以促进塑料废物回收利用的实际应用.

主要方法:

通过使用K. pneumoniae和E. coli的基因扩展BA07Δ中的1,3-PDO同化途径来构建PA16菌株.
适应性实验室进化 (ALE) 以优化1,3-PDO的生长.
转录组分析以识别PA16中的上调基因与其祖先 (PA1) 相比,重点关注代谢途径.
基因过度表达研究,以验证已识别的基因在增强细胞密度中的作用.

主要成果:

工程化大肠杆菌菌株PA16通过在72小时内消耗6.5g/L的1,3-PDO,实现了高细胞密度 (OD600的7).
转录基因分析显示,氨酸脱酶 (EcTdh) 和参与氨酸降解的2 - 氨基-3 - 酸甲酸联酶 (EcKbl) 的显着上调.
在前体PA1菌株中,EcTdh和EcKbl的过度表达导致细胞密度增加5倍.
简化的PA16介质只需要0.1g/L的氨酸,在定义的介质中以10g/L的1,3-PDO和0.1g/L的氨酸增长到3的OD600.

结论:

工程化大肠杆菌菌株PA16表明,从塑料废物中获得的1,3-propanediol (1,3-PDO) 的生物转化具有重大潜力.
识别和过度表达氨酸降解基因 (EcTdh和EcKbl) 对于增强1,3-PDO上的微生物生长至关重要.
对PA16的简化定义的介质要求促进其在塑料衍生化学品的可持续上循环过程中的应用.

关键词:

1,3-PDO同化方式适应性实验室进化的演变.代谢工程是代谢工程.塑料废弃物的再循环利用合成路径重建的重建非传统的基板利用利用.

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