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Itaconic acid production in microorganisms.

Meilin Zhao1,2, Xinyao Lu1,2, Hong Zong1,2

  • 1The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China.

Biotechnology Letters
|January 5, 2018
PubMed
Summary
This summary is machine-generated.

Itaconic acid, a versatile bio-based chemical, is produced by fungi but at lower titers than citric acid. This review explores metabolic engineering and process optimization to boost itaconic acid production.

Keywords:
Aspergillus terreusBiosynthetic pathwaysItaconic acidMetabolic engineeringUstilago mayolis

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Area of Science:

  • Biotechnology
  • Industrial Microbiology
  • Metabolic Engineering

Background:

  • Itaconic acid (2-methylidenebutanedioic acid) is a key bio-based precursor for polymers, chemicals, and fuels.
  • Fungal synthesis, notably by Aspergillus terreus and Ustilago maydis, yields significant titers (85 and 53 g L⁻¹, respectively).
  • Current itaconic acid titers lag behind citric acid, a major fermentation product exceeding 200 g L⁻¹.

Purpose of the Study:

  • To review biosynthetic pathways for itaconic acid.
  • To summarize recent advances in metabolic engineering and process optimization for enhanced itaconic acid production.
  • To identify future strategies for improving itaconic acid productivity.

Main Methods:

  • Review of existing literature on itaconic acid biosynthesis.
  • Analysis of metabolic engineering strategies applied to native and heterologous producers.
  • Evaluation of process optimization techniques for itaconic acid fermentation.

Main Results:

  • Two primary pathways for itaconic acid biosynthesis are identified.
  • Metabolic engineering and process optimization have shown promise in increasing itaconic acid titers.
  • Engineered strains like Aspergillus niger and yeasts demonstrate potential for itaconic acid production.

Conclusions:

  • Significant progress has been made in enhancing itaconic acid productivity through advanced engineering and optimization.
  • Further research is needed to overcome existing limitations and achieve higher yields.
  • Itaconic acid holds great potential as a sustainable platform chemical.