Research progress in cellulosomes and their applications in synthetic biology

FENG Yingang; LIU Yajun; CUI Qiu

doi:10.12211/2096-8280.2021-029

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Research progress in cellulosomes and their applications in synthetic biology

Invited Review | 更新时间：2025-03-20

- Research progress in cellulosomes and their applications in synthetic biology
- Synthetic Biology Journal Vol. 3, Issue 1, Pages: 138-154(2022)
- 作者机构：
  
  1.中国科学院青岛生物能源与过程研究所，中国科学院生物燃料重点实验室，山东省合成生物学重点实验室，山东青岛 266101
  2.中国科学院青岛生物能源与过程研究所，山东省单细胞油脂工程实验室，青岛市单细胞油脂工程实验室，山东青岛 266101
  3.中国科学院大学，北京 100049
- 作者简介：
- 基金信息：
- DOI：10.12211/2096-8280.2021-029
  CLC： Q816
- Received：26 February 2021，
  
  Revised：2021-04-10，
  
  Published：28 February 2022
- 稿件说明：
移动端阅览
冯银刚，刘亚君，崔球. 纤维小体在合成生物学中的应用研究进展［J］. 合成生物学， 2022， 3（1）： 138-154

FENG Yingang， LIU Yajun， CUI Qiu. Research progress in cellulosomes and their applications in synthetic biology［J］. Synthetic Biology Journal， 2022， 3（1）： 138-154
冯银刚，刘亚君，崔球. 纤维小体在合成生物学中的应用研究进展［J］. 合成生物学， 2022， 3（1）： 138-154 DOI： 10.12211/2096-8280.2021-029.

FENG Yingang， LIU Yajun， CUI Qiu. Research progress in cellulosomes and their applications in synthetic biology［J］. Synthetic Biology Journal， 2022， 3（1）： 138-154 DOI： 10.12211/2096-8280.2021-029.

摘要

纤维小体是一种高效降解木质纤维素的多酶复合体，主要由自然界中一些梭菌纲厌氧细菌合成及分泌。纤维小体具有模块化、多样化、自组装、协同高效、底物自适应等特征，与合成生物学的工程化策略非常吻合，近年来在生物技术特别是合成生物技术中得到了大量的应用。本文简要介绍了纤维小体的基本架构和高效作用机制，从不同的方面综述了纤维小体在合成生物学研究中的应用研究进展，包括人工纤维小体、底物通道与合成代谢通路构建、细胞表面展示与酶固定化、仿纤维小体设计与构建等。并对纤维小体当前研究的热点问题及其在合成生物学中的应用方向进行了展望，可以预见，基于纤维小体研究所获得的多种蛋白质元件以及建立的工程化策略将在合成生物学中发挥重要作用。

Abstract

Cellulosomes are multi-enzyme complexes secreted by some anaerobic bacteria which can efficiently degrade lignocellulose. All known cellulosome-producing bacteria belong to Clostridia

including both mesophilic and thermophilic species. Cellulosomes contain non-covalent combinations of scaffolding subunits (scaffoldins) and catalytic subunits. Each of these types of subunits is composed of a variety of covalently-linked tandem modules (i.e. structural domains)

which can be roughly classified into four categories: assembly modules

catalytic modules

substrate-binding modules

and cell-binding modules. Cellulosomes in different species have different numbers of scaffoldins and catalytic subunits

and the scaffoldins contain different numbers and types of assembly modules. Therefore

cellulosome structures from different species show great diversity. The architecture of cellulosomes results in multi-level synergistic effects

including the synergy between different enzymes

enzymes and substrates

and enzymes and cells. In addition to the structural complexity and multiple levels of complementary synergy

cellulosomes also have a high degree of conformational flexibility to adapt to the complexity of substrate structures. Furthermore

cellulosome-producing bacteria have developed substrate-coupling regulatory mechanisms to achieve adaptability for complex substrates. These characteristics of modularity

diversity

self-assembly

synergy

high efficiency

and adaptability are highly applicable in synthetic biology. Therefore

in recent years

cellulosomes have been widely used in biotechnology

especially in synthetic biotechnology. This article first briefly introduces the structural basis and mechanism of cellulosomes for highly efficient lignocellulose degradation

and then summarizes the progress in their utilization in different synthetic biotechnology applications

including the construction of designer cellulosomes

substrate channeling and synthetic metabolic pathway construction

cell surface display and enzyme immobilization

and artificial cellulosome construction. The designer cellulosomes contain defined catalytic components located in the specific positions of the scaffoldin

which not only facilitates basic research into the mechanism of the cellulosome

but also provides a solid foundation for biotechnology and synthetic biology applications. Designer cellulosomes can be used to construct a variety of different metabolic pathways in a variety of hosts

often resulting in a several-fold increase in the reaction rate or yield. Natural cellulosomes can be immobilized onto the cell surface through the S-Layer Homology module and/or the surface of the substrate through the carbohydrate-binding module. These immobilization characteristics have also been widely used in synthetic biotechnology. These applications mainly include displaying cellulosomes on the surface of microbial cells that cannot degrade cellulose

giving them the ability to degrade cellulose

and functionalizing the surface of cells

cellulose

or other solid materials (such as nanoparticles) by displaying various enzymes. The major advantages of the cellulosome structure lie in the self-assembly of supramolecular systems and the synergy of multi-enzyme systems

which inspire researchers to develop artificial cellulosomes: supramolecular complexes formed by the interaction of various biomolecules to mimic the structure of cellulosomes. The materials and systems used as scaffolds in artificial cellulosomes are complex and diverse

but the core approach is to construct the scaffold to allow the proximity of different enzymes

resulting in efficient molecular nanomachines or functional biomaterials. Finally

this article looks ahead to the upcoming key areas in cellulosome research and future applications of cellulosomes and cellulosome-producing bacteria. Various protein components and engineering strategies revealed in the study of cellulosomes will play an important role in the future development of synthetic biology.

关键词

Keywords

references

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