Corynebacterium glutamicum LysA Promoter Mutation for L-Lysine Yield
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Solution Overview
Problem
Existing methods for enhancing L-lysine production in Corynebacterium glutamicum strains do not effectively address the activity of diaminopimelate decarboxylase, a crucial enzyme in the L-lysine biosynthetic pathway, leading to suboptimal production yields.
Innovation Solution
A Corynebacterium glutamicum variant is developed by substituting specific nucleotide sequences in the promoter of the lysA gene encoding diaminopimelate decarboxylase, enhancing its activity through mutations, thereby increasing gene expression and enzyme activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nucleotide sequences in the promoter of lysA gene are substituted to enhance diaminopimelate decarboxylase activity, then L-lysine production ability is improved, but the complexity of strain development increases
Solution Approach 1:
The patent applies parameter changes by substituting specific nucleotide sequences in the promoter region of the lysA gene (changing the genetic parameters) to enhance the expression level and activity of diaminopimelate decarboxylase. This directly increases L-lysine production ability by modifying the biochemical parameters of the enzyme system without requiring complex multi-gene modifications.
2Productivity
If multiple genes and proteins involved in L-lysine production are modified to increase production ability, then L-lysine yield is improved, but the time and resources required for research and development increase
Solution Approach 1:
The patent applies local quality by focusing modifications specifically on the promoter region of the lysA gene that encodes diaminopimelate decarboxylase, which catalyzes the final step in L-lysine biosynthesis. Instead of randomly modifying multiple genes throughout the metabolic pathway, the invention targets the critical local region (promoter sequence) that controls the rate-limiting enzyme, thereby achieving high L-lysine yield with reduced R&D time and resources.
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 variant exhibits a 2% to 30% increase in L-lysine production, producing 60 to 80 g of L-lysine per liter of culture, surpassing the capabilities of parent strains.
Implementation Method 1
substituting a nucleotide sequence at a specific position in a promoter of lysA gene encoding diaminopimelate decarboxylase... increase expression of the genes
Implementation Method 2
diaminopimelate decarboxylase... catalyzes a reaction of producing carbon dioxide and L-lysine by cleaving carbon bonds of meso-diaminoheptanedioate (mDAP)
Data Source
AI summary
The present invention relates to a Corynebacterium glutamicum variant having an improved L-lysine production ability, and a method for producing L-lysine by using same. The Corynebacterium glutamicum variant increases or enhances the expression of a gene encoding diaminopimelate decarboxylase, and thus can have a L-lysine production yield superior to that of a parental strain.