Nisin Derivatives Hinge Region Mutations Antimicrobial Activity
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Solution Overview
Problem
Current nisin derivatives exhibit limited activity against gram-positive pathogens and resistance issues, necessitating the development of antimicrobial agents with enhanced bioactivity against specific bacterial strains, including those resistant to existing nisin forms.
Innovation Solution
Generation of nisin derivatives with specific amino acid substitutions in the hinge region, such as N20P, M21V, K22T, and other mutations, which enhance antimicrobial activity against gram-positive bacteria like Staphylococcus aureus, Clostridium sporogenes, and Listeria monocytogenes, while maintaining or improving activity against other pathogens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nisin derivatives with amino acid substitutions in the hinge region are generated, then antimicrobial activity against gram-positive bacteria is enhanced, but protein structure stability may be affected
Solution Approach 1:
The patent applies parameter changes by systematically substituting amino acids at specific positions (20, 21, 22) in the hinge region of nisin. This modifies the local chemical parameters (side chain properties, charge, hydrophobicity) to enhance antimicrobial activity while the overall protein structure remains intact due to the targeted nature of substitutions.
Solution Approach 2:
The invention applies local quality by making specific amino acid substitutions only in the hinge region (positions 20-22) while leaving the rest of the protein structure unchanged. This localized modification approach enhances antimicrobial activity in the critical hinge region without compromising the stability of the overall protein structure.
2Reliability
If nisin derivatives are developed to overcome bacterial resistance, then effectiveness against resistant strains is improved, but complexity of derivative development increases
Solution Approach 1:
The patent applies segmentation by dividing the nisin protein into functional regions and focusing modifications specifically on the hinge region (positions 20-22). This segmented approach allows systematic development of derivatives to overcome resistance without requiring complex modifications throughout the entire protein structure.
Solution Approach 2:
The invention uses parameter changes by substituting amino acids with different properties at specific hinge region positions to create derivatives with enhanced activity against resistant strains. This systematic parameter modification provides a manageable approach to developing multiple derivative variants.
3Reliability
If amino acid substitutions are made in the hinge region, then bioactivity against specific bacterial strains is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by concentrating amino acid substitutions in the specific hinge region (positions 20-22), which creates a localized modification zone. This approach enhances bioactivity while limiting the scope of precision requirements to a small, defined region of the protein rather than the entire structure.
Data Source
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AI summary
The present invention relates to a nisin derivative comprising amino acid substitutions in the peptide sequence encoding the hinge region of the protein, wherein the derivative exhibits an increased anti-microbial activity.