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中国生物工程杂志

China Biotechnology
China Biotechnology  2022, Vol. 42 Issue (7): 90-100    DOI: 10.13523/j.cb.2203072
    
Research Progress on the Cyanobacterial Photosynthetic Production of Sugars Utilizing Carbon Dioxide
Xue-xia ZENG1,2,3,Yu DAN1,2,3,Shao-ming MAO1,2,**(),Jia-hui SUN3,4,5,Guo-dong LUAN3,4,5,**(),Xue-feng LV3,4,5
1. College of Life Science and Technology, Central South University of Forestry and Technology, Changsha 410004, China
2. Hunan Provincial Key Laboratory of Forestry Biotechnology, Central South University of Forestry & Technology, Changsha 410004, China
3. Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
4. Shandong Energy Institute, Qingdao 266101, China
5. Qingdao New Energy Shandong Laboratory, Qingdao 266101, China
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Abstract  

Sugar substances are widely used in the fields of food, medicine, daily chemical and fermentation, and are of great significance to human health and social development. For a long time, the production of sugar substances has been practically based on the collection and planting-harvesting of plant biomass. Solar energy and carbon dioxide would be fixed in plant photosynthesis process, and stored in the form of sugars (starch, cellulose, and sucrose) in biomass. The bulk sugar feedstock would be extracted from plant biomass, and then be utilized for generation of other sugar products through multiple steps of conversion, refinery, and purification. The dependence on the plant sourced biomass of current sugar production technology leads to the unavoidable risks and drawbacks of long cultivation term, climate & location constraints, and high pre-treatment costs. The development of novel technologies for sugar production is conducive to removing the bottlenecks faced by the traditional modes derived from plant biomass harvesting-refining industry. Cyanobacteria are an important group of photoautotrophic prokaryotic microorganisms and are also supposed to be promising microbial photosynthetic platforms. The development of cyanobacterial synthetic biotechnology has facilitated the direct conversion of carbon dioxide into dozens of natural and non-natural metabolites, of which sugars are a representative group. Cyanobacterial photosynthetic production of sugars is expected to realize the one-step conversion of carbon dioxide into specific sugar products and to refresh the paradigm of current sugar production technology. Sugar metabolites play important roles in the natural photosynthetic metabolic network of cyanobacteria, especially that the operations of several important physiological modules such as the Calvin cycle, glycogen metabolism, and compatible substance metabolism, are mainly promoted by the conversion and metabolism of multiple sugars and sugar-derived metabolites. Although some progress has been made in the synthesis of special sugar substances using natural cyanobacterial resources, such as the successful development and industrial application of the technology of Spirulina large-cultivation based glycerol glucosides production, there are still many challenges in the development and application of this mode. In recent years, the development of synthetic biotechnology has been providing new driving forces for remodeling and expanding the cyanobacterial photosynthetic sugar metabolism networks. Through specific transporter engineering, secretory production of some important sugar products, e.g. sucrose and trehalose, has been achieved, and it significantly relieved the metabolic stress from intracellular storage and increased the product titers. In addition, the sugar secretions would facilitate the development of derived technologies such as in situ separation and extraction of products as well as construction of artificial photosynthesis driven consortium. In combination with metabolic engineering strategies from multiple levels and steps, the production efficiency of cyanobacterial sugars would be significantly enhanced, photosynthetic production of novel sugar products would be achieved, and the updating of the sugar production routes could be expected. This review systematically summarized the progress and challenges in developing and utilizing cyanobacterial photosynthetic sugar production technologies, and discussed the future development prospects and research directions.



Key wordsCyanobacteria      Photosynthesis      Sugar      Synthetic biology     
Received: 31 March 2022      Published: 03 August 2022
ZTFLH:  Q493.4  
Corresponding Authors: Shao-ming MAO,Guo-dong LUAN     E-mail: msm526@163.com;luangd@qibebt.ac.cn
Cite this article:

Xue-xia ZENG,Yu DAN,Shao-ming MAO,Jia-hui SUN,Guo-dong LUAN,Xue-feng LV. Research Progress on the Cyanobacterial Photosynthetic Production of Sugars Utilizing Carbon Dioxide. China Biotechnology, 2022, 42(7): 90-100.

URL:

https://manu60.magtech.com.cn/biotech/10.13523/j.cb.2203072     OR     https://manu60.magtech.com.cn/biotech/Y2022/V42/I7/90

Fig.1 Sugar metabolits in natural photosynthetic metabolism network of cyanobacteria Synechococcus elongatus PCC 7942 RuBP: Ribulose-1,5-biphophate; CO2: Carbon dioxide; 3PG: 3-Phosphoglycerate; 1,3-BPG: 1,3-Biphosphoglycerate; G3P: Glyceraldehyde 3-phosphate; FBP: Fructose-1,6-biphosphate; F6P: Fructose-6-phosphate; X5P: Xylose-5-phosphate; Ru5P: Ribulose-5-phosphate; DHAP: Dihydroxyacetone phosphate; E4P: Erythritose-4-phosphate; SBP: Sedoheptulose-1,7-biphosphate; S7P: Sedoheptulose-7-phosphate; R5P: Ribose-5-phosphate; G6P: Glucose-6-phosphate; G1P: Glucose-1-phosphate; ADP-G: ADP-glucose; UDP-G: UDP-glucose; Suc6P: Sucrose-6-phosphate
宿主 产物 改造策略 产量 引文
聚球藻UTEX 2973 蔗糖 导入大肠杆菌CscB蔗糖转运蛋白 8 g/L [45]
聚球藻PCC 7942 海藻糖 过量表达鱼腥藻MTS-MTH途径;阻断蔗糖合成途径;导入非洲摇蚊TreT海藻糖转运蛋白 5.7 g/L(半连续批次培养) [46]
聚球藻PCC 7942 果糖、葡萄糖 过量表达蔗糖水解酶InvA;导入来自运动发酵单胞菌的己糖转运蛋白Glf 27 mg/L, 5.4 mg/L [50]
集胞藻PCC 6803 赤藓糖醇 导入Trichosporonoides megachiliensis赤藓糖-4-磷酸-磷酸酶和来自酿酒酵母的藓糖还原酶 256 mg/L [48]
聚球藻PCC 7002 甘露糖醇 导入大肠杆菌甘露糖醇-1-磷酸脱氢酶和艾美尔式菌甘露糖醇-1-磷酸酶;阻断糖原合成途径 1.1 g/L [49]
聚球藻PCC 7942 木糖醇 导入大肠杆菌来源的木糖转运蛋白XylE和白色念珠菌木糖还原酶XR 33 g/L(木糖为底物)
Table 1 Artificial construction of cyanobacterial photosynthetic cell factories for sugar production
Fig.2 Development of the cyanobacterial photosynthetic sugar production modes driven by synthetic biotechnology (a) Traditional sugar production with wildtype cyanobacteria strains following the harvest & extraction routines (b) Engineering cyanobacteria cell factories for continuous secretory production of sugars (c) Construction of artificial consortium based on cyanobacterial secretory production of sugars (d) Engineering cyanobacteria for photosynthetic bioconversion
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