Toward Homosuccinate Fermentation: Metabolic Engineering of Corynebacterium glutamicum for Anaerobic Production of Succinate from Glucose and Formate

被引:173
作者
Litsanov, Boris [1 ]
Brocker, Melanie [1 ]
Bott, Michael [1 ]
机构
[1] Forschungszentrum Julich, Inst Bio & Geowissensch, IBG Biotechnol 1, D-52425 Julich, Germany
关键词
RECOMBINANT ESCHERICHIA-COLI; ACID-PRODUCING BACTERIUM; MOLECULAR ANALYSIS; MANNHEIMIA-SUCCINICIPRODUCENS; PYRUVATE PRODUCTION; RESPIRATORY-CHAIN; GENOME SEQUENCE; GENE-EXPRESSION; ORGANIC-ACIDS; FED-BATCH;
D O I
10.1128/AEM.07790-11
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Previous studies have demonstrated the capability of Corynebacterium glutamicum for anaerobic succinate production from glucose under nongrowing conditions. In this work, we have addressed two shortfalls of this process, the formation of significant amounts of by-products and the limitation of the yield by the redox balance. To eliminate acetate formation, a derivative of the type strain ATCC 13032 (strain BOL-1), which lacked all known pathways for acetate and lactate synthesis (Delta cat Delta pqo Delta pta-ackA Delta ldhA), was constructed. Chromosomal integration of the pyruvate carboxylase gene pyc(P458S) into BOL-1 resulted in strain BOL-2, which catalyzed fast succinate production from glucose with a yield of 1 mol/mol and showed only little acetate formation. In order to provide additional reducing equivalents derived from the cosubstrate formate, the fdh gene from Mycobacterium vaccae, coding for an NAD(+)-coupled formate dehydrogenase (FDH), was chromosomally integrated into BOL-2, leading to strain BOL-3. In an anaerobic batch process with strain BOL-3, a 20% higher succinate yield from glucose was obtained in the presence of formate. A temporary metabolic blockage of strain BOL-3 was prevented by plasmid-borne overexpression of the glyceraldehyde 3-phosphate dehydrogenase gene gapA. In an anaerobic fed-batch process with glucose and formate, strain BOL-3/pAN6-gap accumulated 1,134 mM succinate in 53 h with an average succinate production rate of 1.59 mmol per g cells (dry weight) (cdw) per h. The succinate yield of 1.67 mol/mol glucose is one of the highest currently described for anaerobic succinate producers and was accompanied by a very low level of by-products (0.10 mol/mol glucose).
引用
收藏
页码:3325 / 3337
页数:13
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