无机纳米材料-微生物杂合系统的研究进展
Design and Construction of Inorganic Nanomaterial-Microorganism Hybrid Systems
随着CO2排放问题日益严峻,有效减少碳排放是目前最受关注的热点问题.通过物理封存和化学转化等技术固定CO2能耗大且安全性有待评估,而微生物固定CO2技术凭借其环境友好成为可持续碳捕集方案之一.天然固碳微生物通过卡尔文循环等7种途径固定CO2,然而这些途径的固碳效率仍然面临能量供给不足、关键酶催化效率低等问题,限制了其在工业化碳捕集和转化中的广泛应用.一方面,通过合成生物学和代谢工程等方法可以优化光合自养微生物、化能自养微生物和异养微生物的固碳效率,并将CO2高效转化为多种高值化学品.另一方面,无机纳米材料-微生物杂合系统将半导体纳米材料与微生物结合,利用材料优良的光-电转化性能不仅可以增强光能的捕获和电子传递效率,同时能够显著提升CO2转化为高值化学品的效率.本综述总结了微生物天然固定CO2的7种途径,阐述了光合自养、化能自养和异养微生物固碳途径优化机制的近期进展.同时,总结了这些工程细胞及材料-细胞杂合体系统的设计构建技术,分别介绍了直接电子传递下的无机纳米材料-微生物杂合系统和电子载体介导下的无机纳米材料-微生物杂合系统的重要应用,阐述了纳米材料在固定CO2过程中的关键作用和原理,并展望了该领域的未来发展趋势.
With increasingly serious problems caused by CO2 emissions,the effective reduction of carbon emissions has become one of the most concerning issues. The fixation of CO2 through physical storage and chemical conversion technology consumes a considerable amount of energy,and safety needs to be evaluated. Meanwhile,CO2 fixation technology by microorganisms has transitioned into one of the sustainable carbon capture schemes due to its environmental friendliness. Autotrophic microorganisms fix CO2 in seven pathways,including the Calvin cycle. However,the carbon fixation efficiency of these pathways still faces the problems of insufficient energy supply and low catalytic efficiency of key enzymes,which limit their wide applications in industrial carbon capture and transformation. On the one hand,optimization of the carbon fixation efficiency of photoautotrophic,chemoautotrophic,and heterotrophic microorganisms can be achieved through synthetic biology and metabolic engineering,enabling the efficient conversion of CO2 into various high-value chemicals. On the other hand,inorganic nanomaterial-microorganism hybrid systems combine semiconductor nanomaterials with microorganisms. The excellent light-electrical conversion performance of materials can not only enhance the light energy capture and electron transfer efficiency,but also considerably improve the efficiency of CO2 conversion to high-value chemicals. This review summarizes seven pathways in which microorganisms naturally fix CO2 and addresses recent advances in the optimization mechanisms of photoautotrophic,chemoautotrophic,and heterotrophic microorganisms. Moreover,this review summarizes the design and construction techniques of these engineered cell and material-cell hybrid systems,inorganic nanomaterial-microorganism hybrid systems with underlying mechanisms of direct electron transfer and mediation by electron carriers,the key role and principles of nanomaterials in CO2 fixation,and the future development trend of this field.
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国家自然科学基金资助项目(22378305)
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