Native Cell Membrane Nanoparticles for Detergent-Free Protein Extraction
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Solution Overview
Problem
Current methods for extracting membrane proteins often require harsh detergents, which destabilize the membrane and denature the proteins, and existing detergent-free methods like SMALP are unstable in certain environments and limited in compatibility with certain membrane proteins.
Innovation Solution
A Native Cell Membrane Nanoparticle (NCMN) system using specific polymers that maintain the native structure and functional activity of membrane proteins, allowing for detergent-free extraction and stabilization in various environments, including low pH and temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If harsh detergents are used to extract membrane proteins, then extraction efficiency is improved, but protein structure and function are denatured
Solution Approach 1:
The patent introduces nanodiscs as an intermediary structure that mediates between the membrane protein and the aqueous environment. The nanodisc consists of a lipid bilayer enclosed by a stabilizing belt (such as scaffold proteins or polymers), which allows the membrane protein to be extracted from the native membrane while maintaining its native structure and function without requiring harsh detergents
Solution Approach 2:
The patent changes the physical-chemical parameters of the extraction system by using nanodiscs with controlled lipid composition and stabilizing belts that provide a native-like membrane environment. This allows extraction under mild conditions that preserve protein structure while maintaining extraction efficiency
2Stability of the object's composition
If detergents are used to solubilize membrane proteins, then solubility is improved, but annular lipids are stripped away and protein function is lost
Solution Approach 1:
The nanodisc acts as an intermediary that provides a native-like lipid environment around the membrane protein. The lipid bilayer of the nanodisc preserves the annular lipids that are crucial for protein function, while the stabilizing belt provides solubility in aqueous environments without requiring detergent molecules
Solution Approach 2:
The nanodisc is a composite structure consisting of lipids, stabilizing belt molecules (such as scaffold proteins or polymers), and embedded membrane proteins. This composite material provides both solubility in aqueous environments and preservation of the native lipid environment necessary for protein function
3Reliability
If detergent-free methods like SMALP are used, then protein stability is improved, but compatibility with certain membrane proteins is limited
Solution Approach 1:
The patent employs scaffold proteins or polymers as stabilizing belts that can accommodate a wide variety of membrane proteins with different sizes, shapes, and functional characteristics. This universal approach allows the nanodisc system to stabilize diverse membrane proteins including those incompatible with SMALP methods
Solution Approach 2:
The patent varies the composition of the lipid bilayer and the stabilizing belt to optimize nanodisc properties for different membrane proteins. By adjusting lipid types, chain lengths, and stabilizing belt molecules, the system achieves broad compatibility while maintaining protein stability under detergent-free conditions
4Manufacturing precision
If multiple steps are used in detergent-free extraction, then protein purity is improved, but process complexity increases
Solution Approach 1:
The patent combines multiple functions into a single nanodisc formation step. The nanodisc simultaneously extracts the membrane protein from the native membrane, provides a stabilizing environment, and delivers the protein in a purified, native-like state. This merging of functions reduces the number of separate steps required compared to traditional multi-step detergent-free methods
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 NCMN system effectively solubilizes and stabilizes membrane proteins, eliminating the need for detergent titration and wash steps, thereby increasing efficiency and yield, and is compatible with a wide range of membrane proteins, including those previously difficult to isolate.
Implementation Method 1
The SMA co-polymer forms nanoparticles by absorbing, destabilizing and disrupting the cell membrane by a pH-dependent mechanism
Implementation Method 2
The SMA co-polymer inserts into a biological membrane and forms small discs of bilayer encircled by the polymer
Data Source
AI summary
Provided are a Native Cell Membrane Nanoparticle (NCMN) system and methods of using the NCMN polymers to extract and/or purify one or more membrane proteins. The NCMN system includes at least one NCMN polymer and one or more membrane proteins in their native lipid bilayer membrane. A method of using the NCMN system to extract or isolate the one or more membrane proteins in the form of NCMN system without the use of a detergent while maintaining the protein’s native structure and functional activity is provided.