Fluorescent Beta-Lactam Conjugates for PBP Detection
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Solution Overview
Problem
Current methods for detecting penicillin-binding proteins (PBPs) in bacteria are either hazardous due to radiolabeled compounds or lack specificity, making them unsuitable for routine or large-scale analysis and in vivo visualization.
Innovation Solution
Development of conjugates comprising a β-lactam antibiotic linked with a fluorescent tag, allowing selective labeling and visualization of specific PBPs through binding, enabling activity-dependent detection and modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radiolabeled β-lactam is used for detecting PBPs, then detection capability is achieved, but safety hazards and handling difficulty arise
Solution Approach 1:
The patent changes the detection parameter from radiolabeling to fluorescent labeling. The conjugates use fluorophores (such as fluorescein, rhodamine, or cyanine dyes) attached to β-lactam antibiotics, allowing detection of PBPs through fluorescence instead of radioactivity. This maintains detection capability while eliminating radiation hazards associated with radiolabeled compounds.
Solution Approach 2:
The patent employs non-radioactive fluorescent probes that are safer, easier to handle, and do not require special radioactive waste disposal procedures. These fluorescent conjugates can be used routinely without the long-term safety concerns and regulatory burdens associated with radiolabeled compounds.
2Ease of operation
If fluorescent labeling is used for visualizing proteins, then ease of operation is improved, but specificity is lost due to general protein tagging
Solution Approach 1:
The patent segments the PBP detection by creating multiple specialized conjugates, each with different β-lactam structures that selectively bind to specific PBP classes. For example, some conjugates are designed to target class A PBPs while others target class B or C PBPs, enabling selective visualization of different PBP groups within the same system.
Solution Approach 2:
The patent applies local quality by modifying specific regions of the β-lactam structure to confer selectivity for particular PBP types. By altering substituents on the β-lactam ring or the R1-R6 positions, the conjugates achieve localized specificity for different PBP active sites while maintaining the overall fluorescent labeling capability.
3Loss of time
If activity-based probes are used for labeling, then temporal resolution is improved, but complexity of the system increases
Solution Approach 1:
The patent creates a universal platform of fluorescent β-lactam conjugates that can detect multiple PBP types through a common mechanism. All conjugates share the same fundamental structure—a fluorophore attached to a β-lactam antibiotic—and rely on the same acyl-enzyme formation mechanism, simplifying the overall system despite the variety of specific conjugates available.
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 conjugates provide a safer, more specific, and temporally resolved method for detecting PBPs in vivo, allowing for the visualization of specific PBPs in bacterial cells, overcoming the limitations of existing techniques.
Implementation Method 1
Penicillin potentiates PBP function by forming a stable acyl-enzyme intermediate with this residue, which in turn inhibits crosslinking of PG
Implementation Method 2
Y is azide, (C2-C8)alkynyl, 3-8 membered cycloalkyl comprising at least one triple bond, 1,2,4,5-tetrazinyl which is optionally substituted with (C1-C8)alkyl, a fluorescent group, or biotin
Data Source
AI summary
The invention provides a conjugate of formula I:R-L-Y Ior a salt thereof, wherein R, L, and Y have any of the values described in the specification, as well as compositions comprising a conjugate of formula I. The conjugates are useful for labeling.