Unilamellar Liposome Membrane Protein Evolution via Nuclease Treatment
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Solution Overview
Problem
Current methods for molecular evolutionary engineering are limited in targeting and improving membrane proteins, as they are primarily designed for soluble proteins and lack efficient techniques for screening and selecting membrane proteins with desired functions.
Innovation Solution
The development of unilamellar liposomes containing DNA or RNA encoding membrane proteins, along with a cell-free protein synthesis system and a nuclease, which are treated to optimize magnesium concentration and composition, enabling the in-vitro evolutionary engineering of membrane proteins and enhancing screening efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional liposome methods are used for molecular evolutionary engineering, then soluble proteins can be improved, but membrane proteins cannot be effectively targeted
Solution Approach 1:
The patent optimizes specific parameters including intraliposomal magnesium concentration (28.32-50 mM) and nuclease treatment conditions to enable effective membrane protein evolution. These parameter changes make the system adaptable to membrane proteins while maintaining reliable screening functionality.
Solution Approach 2:
The patent introduces nucleases as intermediary agents that selectively degrade external DNA while preserving intraliposomal DNA. This intermediary mechanism enables specific targeting and screening of membrane proteins expressed within liposomes, resolving the contradiction between versatility and reliability.
2Productivity
If nuclease treatment is applied to liposomes, then screening efficiency improves, but DNA degradation risk increases
Solution Approach 1:
The patent segments the system into intraliposomal and extraliposomal compartments. Nucleases are applied externally to degrade only extraliposomal DNA, while the liposome membrane protects intraliposomal DNA. This segmentation enables high screening efficiency without compromising the integrity of functional DNA.
Solution Approach 2:
The patent uses DNA within liposomes as protected templates that serve as copies of the genetic information. These intraliposomal DNA copies are shielded from nuclease degradation, allowing screening of membrane protein variants while preserving the genetic material for subsequent analysis.
3Reliability
If magnesium concentration is optimized in liposomes, then membrane protein function improves, but system complexity increases
Solution Approach 1:
The patent establishes specific magnesium concentration ranges (28.32-50 mM) that optimize membrane protein function within liposomes. By defining clear parameter boundaries, the patent manages system complexity while achieving reliable functional outcomes for membrane protein evolution.
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
This approach allows for the effective selection and collection of membrane proteins with desired functions, particularly transporter proteins, by optimizing the liposome composition and magnesium concentration, thereby improving the sensitivity and efficiency of the screening process.
Implementation Method 1
The unilamellar liposome is treated with a nuclease which is selected from the group consisting of a ribonuclease and a deoxyribonuclease
Implementation Method 2
a cell-free protein synthesis system
Data Source
Figure 1A~1D
Figure 2A~2B
Figure 4
AI summary
The objective of the present invention is to improve the efficiency of screening/selection of a membrane protein in molecular evolutionary engineering (for example, an enzyme evolutionary method). The above-described objective is achieved by providing a unilamellar liposome comprising: (a) a DNA comprising a promoter sequence, a translational initiation sequence, and a sequence encoding a membrane protein; (b) an RNA polymerase; (c) a ribonucleotide; and (d) a cell-free protein synthesis system. In one aspect of the present invention, the membrane protein is a transporter, and the unilamellar liposome further comprises (e) a factor that binds to a ligand transported by the membrane protein.