Artificial Biomembrane with Lateral Diffusivity via Nanodiscs
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Solution Overview
Problem
Existing methods fail to reconstitute membrane proteins in artificial biological membranes while retaining lateral diffusivity and stability, leading to low protein density, nonspecific adsorption, and loss of activity.
Innovation Solution
A method involving the partial lamination of a photopolymerizable polymer lipid membrane on a substrate, followed by the lamination of a fluid lipid membrane containing a membrane protein in a nanodisc, using photolithography to form a patterned artificial biological membrane that retains lateral diffusivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If membrane protein is introduced into patterned artificial biological membrane using detergent solubilization method, then membrane protein can be introduced into the membrane, but introduction efficiency is low and membrane protein density is low
Solution Approach 1:
The patent uses nanodiscs as intermediary carriers to deliver membrane proteins into the artificial biological membrane. The nanodiscs serve as a mediator that facilitates efficient protein incorporation without requiring detergent solubilization, thereby improving both introduction efficiency and final protein density in the membrane.
Solution Approach 2:
The patent changes the methodological parameters from traditional detergent-based solubilization to nanodisc-mediated delivery. This parameter change in the introduction mechanism enables significantly higher protein density and introduction efficiency while maintaining membrane protein functionality.
2Stability of the object's composition
If membrane protein is immobilized to patterned artificial biological membrane, then membrane protein can be stabilized, but lateral diffusivity is lost
Solution Approach 1:
The patent applies local quality by creating patterned regions with different properties: polymerized regions provide stability and anchoring, while non-polymerized fluid regions maintain lateral diffusivity. The membrane protein can be selectively positioned in regions that provide the desired combination of stability and mobility.
Solution Approach 2:
The patent introduces dynamics by maintaining a hybrid membrane structure where certain regions are polymerized for stability while other regions remain fluid to preserve lateral diffusivity. This dynamic heterogeneity allows the membrane protein to exhibit both stabilized positioning and maintained mobility depending on the local environment.
3Quantity of substance
If detergent is used to solubilize membrane protein for introduction, then membrane protein can be introduced into membrane, but membrane protein may aggregate and lose activity
Solution Approach 1:
The patent employs nanodiscs as an intermediary delivery system that avoids the harmful effects of detergents. The nanodiscs provide a native-like membrane environment for the protein during delivery, preventing aggregation and maintaining protein activity while still enabling efficient introduction into the artificial membrane.
Solution Approach 2:
The patent converts the harmful effect of detergent-based methods (which cause aggregation and inactivity) into a beneficial nanodisc-mediated delivery system. The nanodiscs provide a protective membrane environment that prevents the harmful aggregation effects while maintaining high introduction efficiency and protein functionality.
4Quantity of substance
If membrane protein is introduced using rapid dilution method, then membrane protein can be introduced into membrane, but nonspecific adsorption occurs and protein density is low
Solution Approach 1:
The patent uses nanodiscs as an intermediary carrier system that delivers membrane proteins specifically to the membrane without causing nonspecific adsorption. The nanodiscs provide a controlled delivery mechanism that maintains high protein density while avoiding the harmful nonspecific interactions that occur with rapid dilution 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 method allows for the reconstitution of membrane proteins with retained lateral diffusivity, enabling functional analysis and evaluation of membrane proteins in an in vitro system, with improved protein density and reduced nonspecific adsorption.
Implementation Method 1
a photopolymerizable lipid membrane is polymerized by a photolithography technology
Implementation Method 2
the membrane protein... retaining lateral diffusivity
Data Source
AI summary
Provided is an artificial biological membrane containing a membrane protein retaining lateral diffusivity. Also provided is a method of producing an artificial biological membrane containing a membrane protein retaining lateral diffusivity. The artificial biological membrane is obtained by a method of producing an artificial biological membrane, the method including a step of partially laminating a polymer lipid membrane (b) on the surface of a substrate (a), followed by the lamination of a fluid lipid membrane (c) on the surface of the substrate (a), on which the polymer lipid membrane (b) is not laminated, together with a peptide nanodisc and a membrane protein (d). The membrane protein (d) is reconstituted in the produced artificial biological membrane at a high probability, and retains lateral diffusivity.