Cell-Derived Membrane Structures with Covalent Orientation Labels

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Solution Overview

Problem

Current methods for monitoring membrane orientation in cell membrane-encapsulated microparticles are limited by antibody recognition, restricting the number of proteins and cell types that can be effectively monitored, and there is a need for more practical solutions to analyze membrane orientation and preserve polarity during preparation.

Innovation Solution

A lipid-based structure with a membrane portion derived from a cell plasma membrane, where at least one membrane protein with an extracellular domain is covalently attached to a label, allowing for the determination of membrane orientation through signal quenching.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If antibody recognition methods are used to monitor membrane orientation, then membrane orientation can be validated, but the number of proteins and cell types that can be effectively monitored is significantly limited

Engineering Contradiction:

Improvenumber of proteins and cell types that can be monitoredVSAvoidcomplexity of monitoring method

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent uses covalently attached labels (such as fluorophores) on membrane proteins that can be universally detected across different cell types and proteins, replacing the need for specific antibodies for each protein target. This universal labeling approach enables monitoring of diverse proteins and cell types with a single detection system.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent replaces the biological recognition system (antibody-protein interaction) with a chemical labeling system (covalent bond between label and protein). This substitution eliminates the limitations of antibody specificity and enables broader applicability across different proteins and cell types.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If current methods are used to create membrane-encapsulated microparticles, then membrane orientation can be investigated, but the process is time-consuming and limits productivity

Engineering Contradiction:

Improvethroughput of membrane orientation analysisVSAvoidtime required for membrane orientation validation

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent performs covalent labeling of membrane proteins with detectable labels before creating the membrane-encapsulated microparticles. This preliminary labeling action enables direct monitoring of membrane orientation during and after the encapsulation process, eliminating the need for time-consuming post-processing validation steps.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent enables continuous monitoring of membrane orientation throughout the microparticle preparation process by incorporating labeled proteins that can be detected at various stages. This continuous detection capability maintains productivity by eliminating interruptions for separate validation experiments.

Inventive Principle:

Principle #20Continuity of useful action

3Reliability

If membrane polarity is not monitored during preparation, then the preparation process is simpler, but the orientation and functionality of membrane proteins cannot be ensured

Engineering Contradiction:

Improvepreservation of membrane polarity and protein orientationVSAvoidcomplexity of preparation process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent incorporates labeled membrane proteins that provide real-time feedback on membrane orientation and polarity during the preparation process. By monitoring the signal from these labels, researchers can adjust preparation conditions to ensure proper orientation is maintained, creating a self-correcting system that improves reliability.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent uses fluorophores or other optically detectable labels that change their signal properties based on their orientation and environment. This allows non-invasive monitoring of membrane polarity and protein orientation through optical detection methods, adding minimal complexity to the preparation process while ensuring proper orientation.

Inventive Principle:

Principle #32Color changes

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

Enables effective monitoring of membrane orientation and polarity preservation, facilitating the analysis of membrane interactions with test agents and enhancing the versatility of membrane-based assays.

Implementation Method 1

determining an amount of a signal emitted by the label from a test sample comprising the structure, whereby an amount of quenching of the signal is indicative of the orientation of the membrane portion

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Implementation Method 2

an amount of quenching of the signal is indicative of the orientation of the membrane portion

Methodology Applied

Scientific EffectSignal quenching: Absorption (EM radiation)

Data Source

PatentUS12460181B2Membrane coverage and orientation and methods, compositions, and kits related thereto

Publication Date: 2025.11.04 GEORGE MASON UNIVERSITY

AI summary

Cells and lipid-based structures are described herein, in particular cells and lipid-based structures comprising membrane portions derived from cells having a label covalently attached thereto, as are compositions and kits comprising such cells and structures, and methods for using the cells and structures, in particular for determining membrane coverage and/or orientation as well as for screening methods/assays, and the like.