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谷氨酸棒杆菌严谨调控系统的构建及其在合成基因组重排中的应用
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蔡瑶瑶(1997-),女,硕士研究生,研究方向:合成生物学,E-mail:yoyo_cyy@foxmail.com 通讯作者:叶燕锐(1981-),男,博士,副教授,研究方向:合成生物学与微生物基因组工程,E-mail:esyanruiye@scut.edu.cn

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广东省自然科学基金面上项目(2023A1515012643)


Design and Application of A Tightly Controlled System in Corynebacterium glutamicum for Synthetic Genome Rearrangement
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    摘要:

    合成生物学技术可以在全基因组范围内调控和改造谷氨酸棒杆菌的代谢网络,但需要一个严谨调控系统来控制Cre重组酶的表达。该研究构建了Cumate-ATc与门诱导系统,使其未诱导时的相对荧光表达量(14.28)显著低于传统IPTG诱导系统(4 238.54)。将进一步结构优化后的诱导系统用于Cre重组酶的可控表达,实现了半合成型谷氨酸棒杆菌semi-synCG-A1-A2(含有111.35 kb合成基因组片段和40个loxPsym位点)的SCRaMbLE。通过PCRTags验证发现,32个重排菌株的位点删除具有偏好性。基因组测序结果显示,重排菌株合成基因组片段长度变为64.50 kb至165.31 kb,其中,重排菌株S-sCG-H同时发生了15个重排事件。结合生长曲线测试和抗逆表型测试,分析了重排菌株基因型和表型之间的相关性。该研究开发了一种严谨调控系统,并成功在含有40个loxPsym位点的半合成型谷氨酸棒杆菌中实现SCRaMbLE。这为谷氨酸棒杆菌的精准育种提供了改造靶点,也为其他菌株的进化研究提供了参考。

    Abstract:

    At the genome-wide level, the metabolic network of Corynebacterium glutamicum can be regulated and modified using synthetic biological approaches. However, Cre recombinase expression requires a tightly controlled system. To achieve this, a Cumate-ATc AND-gate inducible system was constructed, exhibiting a markedly lower uninduced relative fluorescence expression (14.28) compared to the traditional IPTG-inducible system (4 238.54). Cre recombinase was used to perform SCRaMbLE on the semi-synthetic C. glutamicum strain semi-syn CG-A1-A2 (containing 40 loxPsym sites within a 111.35 kb synthetic genome) under the control of an inducible system with additional structural optimization. Thirty-two SCRaMbLEd strains with specific site deletion preferences were verified using PCRTags. Genome sequencing revealed that the synthetic genome length of these SCRaMbLEd strains ranged from 64.50 kb to 165.31 kb. Among them, the SCRaMbLEd strain S-sCG-H underwent 15 simultaneous rearrangement events. The correlation between the genotype and phenotype of the SCRaMbLEd strains was analyzed in conjunction with growth curve and resistance phenotype assessments. The findings highlight that SCRaMbLE was successfully executed in a semi-synthetic C. glutamicum strain containing 40 loxPsym sites using the proposed system, providing modification targets for the precise breeding of C. glutamicum and serving as a reference for evolutionary studies in other strains.

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蔡瑶瑶,张灵,叶燕锐.谷氨酸棒杆菌严谨调控系统的构建及其在合成基因组重排中的应用[J].现代食品科技,2025,41(11):89-98.

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  • 收稿日期:2024-08-02
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  • 在线发布日期: 2025-12-05
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