Chloramphenicol-Resistant Split CAT for Rapid PPI Detection

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Solution Overview

Problem

Existing split DHFR systems for studying protein-protein interactions (PPI) require restrictive media conditions and prolonged growth times due to their reliance on bacteriostatic antibiotics like trimethoprim, making it difficult to quantify and analyze protein interactions efficiently.

Innovation Solution

A novel split chloramphenicol acetyltransferase (CAT) system that allows bacterial growth in rich media by resisting chloramphenicol, enabling rapid and efficient detection of protein interactions using a bacteriostatic antibiotic that does not depend on metabolite limitations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If split DHFR system uses bacteriostatic antibiotic trimethoprim, then protein interaction detection is enabled, but bacterial growth is inhibited and experimental time is prolonged

Engineering Contradiction:

Improveprotein interaction detectionVSAvoidexperimental time

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent changes the antibiotic resistance mechanism from DHFR-based (metabolite-dependent) to CAT-based (direct antibiotic resistance). This parameter change allows bacteria to grow in rich media containing chloramphenicol while expressing the split reporter system, eliminating the need for restrictive metabolite-free conditions and prolonged incubation periods.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If split DHFR system uses restrictive media conditions, then antibiotic resistance selection is achieved, but bacterial growth is limited and throughput is reduced

Engineering Contradiction:

Improveantibiotic resistance selectionVSAvoidscreening throughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The invention transitions from metabolite-restrictive media (required for DHFR systems) to antibiotic-containing rich media (enabled by CAT system). This allows unrestricted bacterial growth and high-throughput screening while maintaining selection pressure through chloramphenicol resistance, directly increasing screening throughput.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If split CAT system allows bacterial growth in rich media, then screening throughput is increased, but selection pressure must be maintained

Engineering Contradiction:

Improvescreening throughputVSAvoidselection pressure

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent uses chloramphenicol as an intermediary substance that maintains selection pressure while allowing rich media growth. The split CAT system reconstitutes to provide resistance against this antibiotic, creating a reliable selection mechanism that works in conjunction with nutrient-rich growth conditions, thus maintaining both high throughput and reliable selection.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Facilitates high-throughput screening and rapid quantification of protein interactions by allowing bacterial growth in rich media, reducing experimental time and enhancing the analysis of protein interactions.

Implementation Method 1

the N-terminal fragment is capable of associating with the C-terminal fragment to generate an active CAT that is capable of acetylating chloramphenicol

Methodology Applied

Scientific EffectEnzyme catalysis: Enzyme

Data Source

PatentUS12428637B2Chloramphenicol resistant split protein and uses thereof

Publication Date: 2025.09.30 TECH INNOVATION MOMENTUM FUND ISRAEL

AI summary

A system for expressing a chloramphenicol split protein is disclosed. Uses thereof are also disclosed.