Antimicrobial Peptide with Variable Domains and Linkers
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Solution Overview
Problem
The increasing problem of antibiotic-resistant bacteria necessitates the development of new antimicrobial agents, as traditional antibiotics are becoming less effective against infections.
Innovation Solution
An antimicrobial peptide with variable domains of 2 to 20 consecutive basic amino acids, separated by linkers, and potentially modified with D-amino acids, derived from the arginine-rich domain of a hepadnavirus core protein, exhibiting broad-spectrum activity against bacteria, fungi, and viruses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional antibiotics are used for treatment, then bacterial infections can be controlled, but antibiotic-resistant bacteria develop reducing effectiveness
Solution Approach 1:
The patent modifies the amino acid sequence parameters of the HBcARD peptide by introducing variable domains with different lengths (2-20 amino acids) and compositions (basic amino acids including arginine, lysine, histidine), separated by variable linkers (1-20 amino acids). These parameter changes create multiple peptide variants with optimized antimicrobial activity while maintaining stability against bacterial resistance mechanisms.
Solution Approach 2:
The patent creates composite peptide structures by combining the HBcARD core sequence with variable domains and linkers, forming chimeric peptides that integrate the arginine-rich domain's inherent antimicrobial properties with additional functional elements. This composite approach enhances broad-spectrum activity against Gram-positive and Gram-negative bacteria while overcoming resistance issues.
2Reliability
If peptide length is increased to improve antimicrobial activity, then potency increases, but peptide stability and manufacturability decrease
Solution Approach 1:
The patent segments the peptide into distinct functional modules: variable domains (2-20 amino acids each containing basic amino acids) separated by variable linkers (1-20 amino acids). This segmentation allows each domain to contribute specific functions while the modular structure simplifies design and manufacturing compared to continuous long sequences.
Solution Approach 2:
The patent applies local quality by concentrating basic amino acids (arginine, lysine, histidine) specifically within the variable domains while the linkers contain different amino acid compositions. This localized distribution of charged residues optimizes antimicrobial activity at specific regions without requiring the entire peptide to be excessively long or complex.
3Stability of the object's composition
If D-amino acids are used to improve stability, then resistance to proteases increases, but synthesis complexity increases
Solution Approach 1:
The patent changes the stereochemical parameter of specific amino acid residues by substituting L-amino acids with their D-isomers in the variable domains. This parameter change confers resistance to proteolytic degradation while the modular variable domain structure allows selective placement of D-amino acids to balance stability improvements with synthesis feasibility.
Data Source
AI summary
An antimicrobial peptide, the peptide comprising 2 to 20 variable domains, each variable domain is a sequence of 2 to 20 consecutive basic amino acids, wherein (a) the variable domains are separated from each other by a variable linker, (b) the variable linker can have 1 to 20 any amino acids other than two or more consecutive basic amino acids, and (c) the peptide has no more than 100 amino acids.