微生物种群间分工协作在木质纤维素转化中的研究进展
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中国农业大学

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畜禽生物育种全国重点实验室开放课题 (2024SKLAB6-7)


Research Progress on the Division of Labor and Cooperation Among Microbes in Lignocellulose Conversion
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    摘要:

    微生物菌群中不同物种间通过分工协作驱动着自然界中复杂底物的转化。木质纤维素是地球上最丰富的大分子生物质, 其生物转化具有重要的社会、经济和环境效益。联合生物加工被认为是木质纤维素转化的最理想形式, 该过程将传统转化工艺中的产酶、水解和发酵步骤进行整合, 一步化实现木质纤维素的高效转化。虽然通过代谢工程改造可以基于单一菌株实现联合生物加工, 但单过高的代谢压力导致菌株转化效率并不理想。将不同的步骤分配到不同的菌株中, 由菌群实现联合生物加工已成为当前木质纤维素转化领域关注的重点。然而, 由于对微生物种间分工缺乏系统认识和理性设计, 人工菌群的效率和稳定性仍然备受挑战。本文聚焦于天然木质纤维素降解菌群中的种间分工, 从底物协同水解、营养因子交叉喂养和“糖骗子”限制的角度综述了目前物种间的分工协作模式。并简单介绍了物种分工在木质纤维素转化中的应用, 以及天然木质纤维素菌群中种间分工研究的挑战和未来发展方向, 为联合生物加工菌群的构建提供设计原则, 推动木质纤维素的高效转化。

    Abstract:

    The transformation of complex substrates in nature is driven by the division of labor among different species within microbial communities. Lignocellulose, the most abundant macromolecular biomass on Earth, holds significant societal, economic, and environmental benefits for its biotransformation. Consolidated bioprocessing (CBP), integrating the traditional steps of enzyme production, hydrolysis, and fermentation into a single-step process, is considered the ideal form of lignocellulose conversion. Although metabolic engineering can enable CBP based on a single strain, the excessively high metabolic stress leads to unsatisfactory conversion efficiency. Allocating different steps to various strains, with the community achieving CBP, has become a focal point in lignocellulose conversion. However, due to a lack of systematic understanding and rational design of interspecies division of labor, the efficiency and stability of artificial microbial communities still need to be improved. This article focuses on the interspecies division of labor within natural lignocellulose-degrading communities, reviewing the current collaborative patterns between species from the perspectives of substrate synergistic hydrolysis, cross-feeding of nutritional factors, and "sugar cheaters" control. It also briefly introduces the application of interspecific division of labor in lignocellulose conversion, as well as the challenges and future development directions in studying the interspecies division of labor within natural lignocellulose communities, providing design principles for constructing CBP communities and promoting the efficient conversion of lignocellulose.

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  • 收稿日期:2024-05-31
  • 最后修改日期:2024-06-30
  • 录用日期:2024-07-05
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