Cysteine-33 Serine Substitution in Corynebacterium Glutamicum for L-Lysine Production
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Solution Overview
Problem
Current methods for increasing L-lysine production in microorganisms, such as Corynebacterium glutamicum, are not sufficient to meet the growing demand, as they rely on enhancing enzyme expression and removing unnecessary genes without achieving optimal yields.
Innovation Solution
A polypeptide with an amino acid sequence where cysteine at position 33 is substituted with serine, encoded by a specific polynucleotide, is introduced into a Corynebacterium glutamicum strain to enhance L-lysine production capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gene expression enhancement and gene removal methods are used to increase L-lysine production, then L-lysine yield is improved, but the production capacity is still insufficient to meet growing demand
Solution Approach 1:
The patent applies parameter changes by substituting cysteine with serine at position 33 of the polypeptide sequence, which modifies the biochemical parameters of the enzyme to enhance its activity. This amino acid substitution changes the local chemical environment and catalytic properties, resulting in improved L-lysine production capacity that exceeds conventional gene expression enhancement methods
2Productivity
If conventional polypeptide sequences are used in Corynebacterium glutamicum, then basic L-lysine production is maintained, but production capacity is limited and cannot be optimized further
Solution Approach 1:
The patent applies local quality by making a specific localized modification at position 33 of the polypeptide sequence, where cysteine is substituted with serine. This localized change improves the overall polypeptide activity and L-lysine production efficiency without compromising the reliability and functionality of the rest of the protein structure
Data Source
Figure 1
AI summary
The present disclosure relates to a novel protein variant, a Corynebacterium glutamicum strain comprising the variant, and a method for producing L-lysine using the strain.