Amphiphilic Vinyl Polymers for Membrane Protein Solubilization

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Solution Overview

Problem

Existing amphipols used for stabilizing membrane proteins in aqueous solutions suffer from limited solubilization properties and often cause denaturation or require complex purification processes, making it difficult to maintain membrane proteins in their native conformation for biotechnological applications.

Innovation Solution

Development of novel amphiphilic vinyl polymers with improved solubilization and stabilization properties, allowing membrane proteins to be solubilized and stabilized in their native form through the formation of small complexes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If detergents are used to solubilize membrane proteins, then solubilization efficiency is improved, but protein stability deteriorates due to denaturation and inactivation

Engineering Contradiction:

Improvesolubilization efficiencyVSAvoidprotein stability

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The invention changes the chemical parameters of the solubilizing agent from conventional detergents to polymeric surfactants with specific molecular weight ranges (1,000-10,000 g/mol) and controlled hydrophobic/hydrophilic balance. This parameter optimization allows effective solubilization while maintaining protein stability, resolving the contradiction between solubilization efficiency and protein stability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses composite polymeric surfactants combining hydrophobic segments (for membrane insertion) and hydrophilic segments (for aqueous solubility) in a specific architecture. This composite structure enables simultaneous achievement of high solubilization efficiency and protein stability, overcoming the limitations of single-function detergents.

Inventive Principle:

Principle #40Composite materials

2Reliability

If conventional surfactants are used to stabilize membrane proteins, then protein stability is improved, but solubilization properties deteriorate

Engineering Contradiction:

Improveprotein stabilityVSAvoidsolubilization efficiency

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The polymeric surfactants of the invention perform multiple functions simultaneously: they act as solubilizing agents, stabilizing agents, and protective agents against aggregation. This multi-functionality resolves the contradiction between stability and solubilization by integrating both functions into a single agent rather than requiring separate surfactants for each purpose.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If membrane proteins are extracted from membranes, then they can be used in aqueous solutions, but they aggregate due to hydrophobic effect

Engineering Contradiction:

Improveaqueous solution compatibilityVSAvoidprotein conformation

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The polymeric surfactants act as intermediary molecules between the hydrophobic transmembrane domains and the aqueous environment. Their amphiphilic structure allows them to mediate the interaction, shielding hydrophobic surfaces while maintaining aqueous solubility, thus preventing aggregation and maintaining conformational stability in aqueous solutions.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Quantity of substance

If detergents are used above CMC to maintain proteins in solution, then solubilization is improved, but protein inactivation increases due to dissociating power

Engineering Contradiction:

Improveprotein solubilityVSAvoidprotein activity

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The invention changes the concentration parameter regime by using polymeric surfactants that maintain effectiveness at lower concentrations compared to conventional detergents. The molecular weight and structural parameters of the polymers provide enhanced solubilization power per unit concentration, reducing the need for high concentrations that cause protein inactivation through excessive dissociating power.

Inventive Principle:

Principle #35Parameter 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

The novel amphiphilic vinyl polymers effectively maintain membrane proteins in a soluble, native conformation, enabling their use in biotechnological applications and diagnostic kits, with enhanced stability and solubility compared to existing amphipols.

Implementation Method 1

the surface of their transmembrane domain is covered with amino acids with hydrophobic chains; the membrane proteins are thus highly insoluble in water due to the hydrophobic effect

Methodology Applied

Scientific EffectHydrophobic interaction: Hydrophobe

Implementation Method 2

amphipols (WO 98/27434) allow proteins to be stabilized but offer much lower solubilization properties. Amphipols are amphiphilic polymers defined as being able to keep membrane proteins in their native, soluble conformation

Methodology Applied

Scientific EffectSurfactant action: Surfactant

Data Source

PatentUS12534550B2Amphipols

Publication Date: 2026.01.27 CENT NAT DE LA RECH SCI (C N R S)

AI summary

The invention relates to polymeric compounds of formula Iwhich allow the solubilization and/or stabilization of membrane proteins, it relates in particular to the complexes they form with membrane proteins and the method of solubilizing and/or stabilizing membrane proteins comprising the use of these compounds.