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【文献速递】南昌大学刘进团队开发海洋微藻合成生物学模块化工具包

  • 2026-02-06 05:48:59
【文献速递】南昌大学刘进团队开发海洋微藻合成生物学模块化工具包

科研动态|南昌大学刘进团队开发海洋微藻合成生物学模块化工具包

01 导读

大气CO₂浓度持续升高给生态系统带来严峻挑战。微藻,尤其是海洋微藻,因其卓越的光合能力、快速生长和无需占用耕地等优势,被视为实现碳中和的生物固碳关键载体之一。其中,工业相关的海洋微藻Nannochloropsis(微拟球藻)是用于日光驱动CO₂价值化的潜力底盘细胞。然而,其合成生物学应用一直受限于缺乏标准化、模块化的遗传操作工具箱。模块化克隆技术(MoClo)基于Golden Gate克隆,可实现复杂遗传线路的高效、灵活构建,已在多种模式生物中成功应用。本研究旨在为Nannochloropsis建立一套功能齐全、扩展性强的MoClo工具包,以突破其遗传工程瓶颈,推动其作为光合细胞工厂的广泛应用。

02 文章亮点

  • 标准化工具箱:针对工业微藻微绿球藻(Nannochloropsis),建立了基于Golden Gate克隆技术的模块化克隆(MoClo)工具箱。

  • 丰富的遗传元件:包含91个标准化的遗传零件,涵盖启动子、终止子、筛选标记、荧光蛋白和标签等。

  • 高效的多基因组装:实现了复杂代谢途径的高效组装,并成功用于微藻中合成高价值的酮类胡萝卜素(角黄素与虾青素)。

03 核心内容

1

建立微绿球藻MoClo工具箱标准规范

研究团队借鉴了植物合成生物学的语法规范,建立了一套包含91个标准化遗传元件的MoClo工具箱。这些零件按照功能分为启动子(P)、终止子(T)、筛选标记(SM)、信号肽(SP)、报告基因(RG)和免疫纯化标签(Tag)等类别,分布于标准化框架的不同位置,支持灵活的模块化组装(图1,表1)。通过标准化的组装流程,从 Level 0 部件到 Level 1 模块,再到包含多个表达盒的 Level 2 载体。

图1.微拟球藻模块化遗传元件示意图

表1.微拟球藻MoClo工具包中的遗传部件

2

核心元件的功能验证与性能评价

筛选标记与启动子-终止子配对评估:研究评估了多种抗生素抗性基因(如Ble, Hyg)在不同启动子-终止子组合下的表达效率。发现源自核糖体亚基的PRIBI启动子与热休克蛋白终止子THS的组合驱动效率显著更高(图2)。进一步使用NanoLuc荧光素酶报告系统评估发现,启动子的活性受其配对终止子的显著影响,为后续元件选择提供了重要指导(图3)。

图2.抗生素抗性基因的模块化组装与测试 

图3.不同启动子-终止子组合驱动报告基因表达的评估

荧光蛋白与亚细胞定位:工具包成功实现了增强型绿色荧光蛋白、黄色荧光蛋白及高光稳定性变体StayGold在藻细胞中的表达。通过融合不同的信号肽(如叶绿体转运肽CTP、核定位序列NLS),实现了蛋白在叶绿体、细胞核等特定细胞器内的精准定位,并展示了多色共定位的应用潜力(图4)。

图4.靶向不同细胞器的荧光蛋白模块化组装与测试

多融合标签用于免疫检测:研究验证了HA、6×His、Flag、Myc和StrepII五种常用表位标签在Nannochloropsis中的功能。通过构建携带不同标签的eGFP融合蛋白,证实这些标签均可用于目标蛋白的特异性免疫检测,其中HA标签信号最强(图5)。

图5.标签蛋白构建体的组装与免疫印迹测试

3

应用:高效构建酮类胡萝卜素合成途径

为展示工具包在代谢工程中的应用潜力,研究团队模块化组装了酮类胡萝卜素(角黄素和虾青素)的生物合成途径并导入微拟球藻。工程藻株成功积累了显著含量的角黄素(4.5 mg/g干重)和虾青素(2.8 mg/g干重)(图6)。此外,研究还发现角黄素能够整合到类囊体膜中,并可能为藻细胞提供高光保护。转录组分析表明,外源酮类胡萝卜素的积累对内源胡萝卜素合成途径的转录水平影响较小(图7)。

图6.酮类胡萝卜素生物合成模块在微拟球藻中的组装与测试

图7.参与类胡萝卜素合成途径的基因转录变化

04 作者简介

通讯作者,刘进,南昌大学资源与环境学院教授,藻类创新工程研究中心主任,国家海外高层次人才(青年),曾先后就职于亚利桑那州立大学、马里兰大学、北京大学,长期致力于藻类代谢与合成生物研究,在植物学领域(Molecular Plant, New Phytologist, Plant Physiology, Plant Journal)和工程技术领域(Nature Communications, Metabolic Engineering, Biotechnology for Biofuels, Bioresource Technology)等TOP期刊发表论文60余篇,主持国家重点研发计划课题、国家自然科学基金面上和国际合作等多个科研项目(总经费超过2000万)。曾入选“科学中国人”2018年度人物、全球前 2%顶尖科学家“年度影响力”榜单(2020-2022)等。

通讯邮箱:gjinliu@ncu.edu.cn

第一作者,郭於潭,南昌大学生命科学学院2023级博士研究生,主要研究方向为微拟球藻遗传工具的开发及微藻代谢与生物合成。

联系邮箱:guoyutan@email.ncu.edu.cn

微藻创新

作者丨郭於谭

编辑丨钱哲宇

审稿丨耿嘉曼、张皓莉

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  1. CONNECT:[ UseTime:0.001183s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001506s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002205s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000957s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001281s ]
  6. SELECT * FROM `set` [ RunTime:0.000668s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001473s ]
  8. SELECT * FROM `article` WHERE `id` = 470390 LIMIT 1 [ RunTime:0.004352s ]
  9. UPDATE `article` SET `lasttime` = 1770788636 WHERE `id` = 470390 [ RunTime:0.004081s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.003603s ]
  11. SELECT * FROM `article` WHERE `id` < 470390 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004049s ]
  12. SELECT * FROM `article` WHERE `id` > 470390 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.016526s ]
  13. SELECT * FROM `article` WHERE `id` < 470390 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011879s ]
  14. SELECT * FROM `article` WHERE `id` < 470390 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012523s ]
  15. SELECT * FROM `article` WHERE `id` < 470390 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.024222s ]
0.249137s