Acrylic Acid-Styrene Nanodiscs for Stable Membrane Protein Solubilization
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Solution Overview
Problem
Existing methods for forming native lipid nanodiscs for studying membrane proteins are limited by the sensitivity of styrene maleic acid copolymers to divalent cations and have a narrow pH range, and the discs formed have low affinity for affinity-based purification methods.
Innovation Solution
The use of copolymers composed of styrene and acrylic acid or its derivatives, which form nanodisc assemblies that solubilize membrane proteins effectively, offering improved stability and affinity for purification methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If styrene maleic acid copolymers are used to form nanodiscs, then membrane proteins can be solubilized in native-like conditions, but the system becomes sensitive to divalent cations and limited in pH range
Solution Approach 1:
The patent changes the chemical composition parameters of the copolymer by replacing maleic acid with acrylic acid or its derivatives. This parameter change eliminates sensitivity to divalent cations and expands the effective pH range while maintaining the nanodisc formation and protein solubilization capabilities.
Solution Approach 2:
The patent uses copolymers composed of styrene and acrylic acid (or derivatives) as composite materials that combine the beneficial properties of both monomer units. The styrene provides hydrophobicity for membrane protein interaction, while the acrylic acid provides pH stability and cation independence, creating a material with superior overall performance.
2Reliability
If styrene maleic acid copolymers are used to form nanodiscs, then membrane proteins can be solubilized, but the discs have low affinity for affinity-based purification methods
Solution Approach 1:
The patent modifies the chemical parameters of the copolymer by incorporating acrylic acid or its derivatives, which can be further functionalized with purification tags or affinity groups. This parameter change enables the nanodiscs to interact with affinity-based purification methods while maintaining their protein solubilization function.
3Productivity
If conventional detergent-based methods are used to solubilize membrane proteins, then proteins can be extracted, but the native lipid environment is lost and native nanodisc forming polymers are still in development
Solution Approach 1:
The patent employs acrylic acid-co-styrene copolymers as temporary, disposable solubilizing agents that can be easily removed or degraded after serving their purpose of extracting membrane proteins while maintaining native-like conditions. These copolymers provide an effective bridge between detergent extraction and native nanodisc formation.
Solution Approach 2:
The patent uses composite copolymer materials that combine the detergent-like ability to extract proteins with the native-like lipid environment preservation. The copolymer structure allows it to interact with both the hydrophobic protein regions and the native lipids, enabling extraction without complete loss of native conditions.
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 new copolymers provide enhanced solubilization of membrane proteins, with up to 10-fold improvement over conventional SMA copolymers, and enable consistent purification and study of membrane proteins in native-like conditions.
Implementation Method 1
Native nanodisc forming polymers are amphipathic polymers capable of dissolving membrane proteins directly from the native lipid bilayer
Implementation Method 2
Native nanodisc forming polymers are amphipathic polymers capable of dissolving membrane proteins directly from the native lipid bilayer
Data Source
AI summary
Provided herein are compositions including lipids and copolymers in the form of a nanodisc assembly. The subject copolymers include monomer units of styrene and monomer units selected from acrylic acid and an acrylic acid derivative. In certain cases, the copolymer is a copolymer of styrene and acrylic acid. Also provided herein, is an aqueous solution comprising the subject composition. Also provided herein, are methods for producing a nanodisc assembly, including incubation of a lipid and a subject copolymer. Further provided herein, are methods for solubilizing a membrane protein in an aqueous solution, wherein the method includes forming a nanodisc assembly of a lipid bilayer having one or more membrane proteins embedded therein, and a subject copolymer. Also provided are methods of solubilizing a hydrophobic constituent in an aqueous solution, including forming a nanodisc assembly of a lipid, a hydrophobic constituent, and a subject copolymer.