Corynebacterium Alanine Dehydrogenase Engineering for High L-Alanine Yield
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Solution Overview
Problem
Existing methods for producing L-alanine, such as chemical synthesis and enzyme conversion, face high costs and low yields due to reliance on petroleum-derived substrates, and naturally-derived strains have limited productivity.
Innovation Solution
Introduce the activity of alanine dehydrogenase from Bacillus licheniformis, Bacillus amyloliquefaciens, or Laceyella sacchari into Corynebacterium microorganisms to enhance their L-alanine-producing ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical synthesis or enzyme conversion is used to produce L-alanine, then L-alanine can be produced, but the production cost increases and yield decreases due to reliance on petroleum-derived substrates
Solution Approach 1:
The patent changes the substrate parameter from petroleum-derived compounds to renewable carbon sources (sugars, starches, cellulose). By introducing alanine dehydrogenase into Corynebacterium glutamicum, the microorganism can convert these alternative substrates into L-alanine, eliminating dependence on expensive petroleum-based feedstocks while maintaining high production yields
Solution Approach 2:
The patent replaces the chemical synthesis mechanism with a biological fermentation mechanism. Instead of using chemical reactions requiring petroleum-derived substrates, the system uses microbial metabolism with alanine dehydrogenase enzyme to convert renewable carbon sources into L-alanine, achieving both cost reduction and high yield
2Productivity
If naturally-derived strains are used to produce L-alanine, then fermentation can supply abundant carbon sources at low cost, but productivity remains low
Solution Approach 1:
The patent makes the Corynebacterium glutamicum strain multi-functional by introducing alanine dehydrogenase activity. The microorganism now serves dual purposes: it maintains its original capability to utilize various carbon sources and gains the new function of high-efficiency L-alanine production, achieving both cost effectiveness and high productivity simultaneously
Solution Approach 2:
The patent changes the enzymatic parameter of the microorganism by introducing alanine dehydrogenase. This enzymatic enhancement transforms the naturally-derived strain from low-productivity to high-productivity, enabling it to convert carbon sources into L-alanine at significantly improved rates while maintaining cost effectiveness
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 modified Corynebacterium microorganisms produce L-alanine with high yield, making them suitable for industrial production.
Implementation Method 1
the activity of alanine dehydrogenase is introduced into a microorganism of the genus Corynebacterium, the L-alanine-producing ability of the microorganism is increased
Implementation Method 2
L-alanine is an important amino acid which is widely applied in the fields of chemistry, food, medicine, etc.
Implementation Method 3
fermentation by microorganisms can supply abundant carbon sources at low cost
Data Source
AI summary
The present disclosure relates to a microorganism of the genus Corynebacterium having an L-alanine-producing ability, into which the activity of alanine dehydrogenase is introduced; a method for producing L-alanine, comprising culturing the microorganism in a medium; a composition for producing L-alanine, comprising the microorganism, a culture product of the microorganism, a fermented product of the microorganism, or a combination of two or more thereof; and the use of the microorganism for the production of L-alanine.