Cis-aconitate Decarboxylase Mutants for Itaconic Acid Yield
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing itaconic acid, a crucial compound in the chemical industry, are limited by the enzymatic activity of wild-type cis-aconitate decarboxylase (CAD) in microorganisms like Aspergillus terreus, which restricts the yield and efficiency of its biosynthesis.
Innovation Solution
Genetically modified Aspergillus strains with CAD mutants carrying mutations in the C-terminal region, specifically in the 441-490 amino acid sequence, exhibit enhanced enzymatic activity, leading to higher itaconic acid production. These mutants are engineered to increase the production levels by introducing specific mutations such as substitutions at positions 489 and 490, and are expressed in host cells for optimal production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wild-type CAD is used in Aspergillus terreus, then the microorganism can produce itaconic acid, but the enzymatic activity is insufficient to achieve high yield
Solution Approach 1:
The patent applies parameter changes by introducing specific amino acid mutations at positions 489 and 490 in the C-terminal region of CAD protein. These mutations alter the enzymatic parameters of the protein, specifically increasing its catalytic activity towards cis-aconitate decarboxylation, thereby achieving higher itaconic acid production yield while maintaining protein functionality
2Reliability
If CAD mutations are introduced to enhance enzymatic activity, then itaconic acid production increases, but the protein sequence deviates from wild-type
Solution Approach 1:
The patent applies local quality by making targeted mutations only at specific positions (489 and 490) in the C-terminal region of the CAD protein, while leaving the rest of the protein sequence unchanged. This localized modification approach enhances enzymatic activity at the active site without compromising the overall structural stability and functional integrity of the protein
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The CAD mutants demonstrate significantly increased enzymatic activity and itaconic acid production compared to wild-type CAD, resulting in higher yields and improved biosynthesis efficiency.
Implementation Method 1
cis-aconitate decarboxylase (CAD) plays the key role in the biosynthesis of this compound
Implementation Method 2
CAD, which converts cis-aconitic acid to itaconic acid
Data Source
AI summary
Cis-aconitate decarboxylase mutants having one or more mutations in a C-terminal region as compared with a wild-type cis-aconitate decarboxylase of Aspergillus terreus.