Genetic strategy for solving chemical engineering problems in biochemical engineering

✍ Scribed by Huimin Yu; Yue Shi; Jin Yin; Zhongyao Shen; Shengli Yang

• Publisher: Wiley (John Wiley & Sons)
• Year: 2003
• Tongue: English
• Weight: 99 KB
• Volume: 78
• Category: Article
• ISSN: 0268-2575
• DOI: 10.1002/jctb.770

✦ Synopsis

Abstract

Genetic manipulation can be used to solve some traditional chemical engineering problems in biochemical engineering such as in poly(β‐hydroxybutyrate) (PHB) production. To reduce the high production costs of PHB resulting from expensive raw materials, low productivity of the process and complexity of recovery steps, PHB biosynthetic genes (__phb__CAB), Vitreoscilla globin gene (vgb) and lytic genes of phage λ with an S amber mutation (S^−^RRz) were simultaneously introduced into the same recombinant Escherichia coli, VG1 (pTU14). This will have the advantages of using __phb__CAB with cheap raw materials and accumulating a high content of PHB, with the ability of vgb to enable a higher specific oxygen uptake rate by the cells, and the characteristics of S^−^RRz to realize controllable cell lysis. In the fermentation of VG1 (pTU14), starch hydrolysate was used in place of glucose as a cheaper carbon source, and a PHB concentration and productivity as high as 167.6 g dm^−3^ and 3.05 g dm^−3^ h^−1^ were easily realized at almost zero levels of dissolved oxygen (DO), and with a simple temperature‐inducing treatment for recovery PHB with a purity of at least 95% was easily harvested.

© 2003 Society of Chemical Industry