Amino Acids

, Volume 43, Issue 6, pp 2301–2311 | Cite as

l-Valine production with minimization of by-products’ synthesis in Corynebacterium glutamicum and Brevibacterium flavum

  • Xiaohu Hou
  • Xinde Chen
  • Yue Zhang
  • He Qian
  • Weiguo Zhang
Original Article

Abstract

Corynebacterium glutamicum ATCC13032 and Brevibacterium flavum JV16 were engineered for l-valine production by over-expressing ilvEBNrC genes at 31 °C in 72 h fermentation. Different strategies were carried out to reduce the by-products’ accumulation in l-valine fermentation and also to increase the availability of precursor for l-valine biosynthesis. The native promoter of ilvA of C. glutamicum was replaced with a weak promoter MPilvA (P-ilvAM1CG) to reduce the biosynthetic rate of l-isoleucine. Effect of different relative dissolved oxygen on l-valine production and by-products’ formation was recorded, indicating that 15 % saturation may be the most appropriate relative dissolved oxygen for l-valine fermentation with almost no l-lactic acid and l-glutamate formed. To minimize l-alanine accumulation, alaT and/or avtA was inactivated in C. glutamicum and B. flavum, respectively. Compared to high concentration of l-alanine accumulated by alaT inactivated strains harboring ilvEBNrC genes, l-alanine concentration was reduced to 0.18 g/L by C. glutamicum ATCC13032MPilvAavtA pDXW-8-ilvEBNrC, and 0.22 g/L by B. flavum JV16avtA::Cm pDXW-8-ilvEBNrC. Meanwhile, l-valine production and conversion efficiency were enhanced to 31.15 g/L and 0.173 g/g by C. glutamicum ATCC13032MPilvAavtA pDXW-8-ilvEBNrC, 38.82 g/L and 0.252 g/g by B. flavum JV16avtA::Cm pDXW-8-ilvEBNrC. This study provides combined strategies to improve l-valine yield by minimization of by-products’ production.

Keywords

l-Valine Corynebacterium glutamicum Brevibacterium flavum alaT avtA 

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Xiaohu Hou
    • 1
    • 2
    • 3
  • Xinde Chen
    • 1
    • 2
  • Yue Zhang
    • 3
  • He Qian
    • 3
  • Weiguo Zhang
    • 3
  1. 1.Laboratory of Renewable Energy and Gas HydrateChinese Academy of SciencesGuangzhouPeople’s Republic of China
  2. 2.Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhouPeople’s Republic of China
  3. 3.The Key Laboratory of Industrial Biotechnology, Ministry of EducationSchool of Biotechnology, JiangNan UniversityWuxiPeople’s Republic of China

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