PGN-Binding DNA Aptamers for Specific Bacterial Differentiation
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Solution Overview
Problem
Existing aptamers lack specificity in binding to peptidoglycan (PGN) while minimizing interaction with counter-targets like lipopolysaccharides (LPS) and lipoteichoic acid (LTA), which complicates bacterial detection and differentiation.
Innovation Solution
Development of DNA aptamers with specific core sequences (SEQ ID NOs: 1-10) that exhibit high affinity for PGN and minimal binding to LPS and LTA, allowing for the detection and differentiation of Gram-negative and Gram-positive bacteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aptamers are designed to bind to peptidoglycan for bacterial cell identification, then binding affinity to bacterial cells is improved, but specificity over counter-targets like lipopolysaccharides and lipoteichoic acid deteriorates
Solution Approach 1:
The aptamer sequence is designed with specific local regions that recognize peptidoglycan structures. The patent identifies specific nucleotide positions and sequences within the aptamer that confer specificity for peptidoglycan over counter-targets, allowing different parts of the aptamer to have specialized binding functions.
Solution Approach 2:
The patent systematically varies aptamer sequence parameters (nucleotide sequences, lengths, and structural features) to optimize binding characteristics. By changing sequence parameters through SELEX methodology and computational design, the aptamers achieve high affinity for peptidoglycan while maintaining specificity away from counter-targets.
2Productivity
If aptamers are used for bacterial cell identification, then detection capability is improved, but ability to distinguish between Gram-negative and Gram-positive bacteria deteriorates
Solution Approach 1:
The patent divides the bacterial cell wall detection into separate recognition functions. Different aptamers or aptamer regions are designed to specifically recognize Gram-positive vs. Gram-negative characteristics, allowing the system to segment the detection task and achieve precise differentiation between bacterial types.
Solution Approach 2:
The aptamer sequences are designed with asymmetric features that create differential binding affinities for Gram-positive and Gram-negative bacteria. The patent utilizes asymmetric nucleotide arrangements and structural features that confer selective recognition, enabling the system to distinguish between bacterial types rather than treating them uniformly.
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 aptamers enable accurate detection and characterization of bacteria in samples, facilitating appropriate antibiotic selection by distinguishing between Gram-negative and Gram-positive bacteria based on PGN presence.
Implementation Method 1
Aptamers are short strands of oligonucleotides that form a three-dimensional structure able to bind a target material with high affinity and specificity
Data Source
AI summary
Described are a number of aptamers that are specific to bind with peptidoglycan (“PGN”) with specificity over counter-targets lipopolysaccharides (“LPS”) and lipoteichoic acid (“LTA”), and associated methods.