Cell-Free In Vitro Translation for Polypeptide Screening
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Solution Overview
Problem
Current high-throughput biophysical assays for screening proteins are inefficient, costly, and labor-intensive, particularly when dealing with large libraries of recombinant proteins, and they often require expensive equipment and purification steps.
Innovation Solution
A method involving coupled cell-free in vitro transcription-translation (IVT) for expressing polypeptides, followed by solution equilibrium titration to determine the binding affinity of the expressed polypeptides to interaction members, allowing for high-throughput screening with less purified polypeptides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional high-throughput biophysical assays are used for screening proteins, then screening capability is provided, but the process becomes inefficient, costly, and labor-intensive
Solution Approach 1:
The patent performs preliminary actions by conducting in vitro transcription and translation to produce polypeptides before the actual affinity screening step. This preliminary production phase allows multiple polypeptide variants to be prepared in advance using cell-free systems, enabling subsequent high-throughput screening without time-consuming cell culture and purification steps for each variant.
Solution Approach 2:
The patent extracts the essential protein synthesis function from living cells by using cell-free in vitro transcription-translation systems. This extraction allows polypeptide production to occur outside cellular machinery, eliminating the need for complex cell culture procedures and enabling direct preparation of polypeptide samples for screening assays.
2Reliability
If conventional protein expression and purification methods are used, then polypeptides are obtained, but the process requires expensive equipment and extensive purification steps
Solution Approach 1:
The patent applies self-service by using cell-free transcription-translation systems that contain all necessary components for protein synthesis within the reaction mixture itself. The system self-regulates the expression process without requiring external cellular machinery, and the produced polypeptides can be directly used in screening assays without extensive purification, as the reaction components do not interfere with binding assays.
Solution Approach 2:
The patent employs disposable cell-free reaction mixtures that can be prepared quickly and used immediately for screening. These short-lived reaction systems eliminate the need for expensive, specialized equipment required for traditional protein expression and purification, allowing standard laboratory equipment to suffice while maintaining reliable polypeptide production.
3Adaptability or versatility
If large libraries of recombinant proteins are screened, then diverse polypeptide variants are evaluated, but the process becomes more time-consuming and resource-intensive
Solution Approach 1:
The patent performs preliminary synthesis of diverse polypeptide variants in parallel using cell-free transcription-translation systems. Multiple DNA templates encoding different variants can be simultaneously processed to produce large libraries of polypeptides before screening begins, enabling high-throughput evaluation of diverse sequences without the time penalty of sequential expression and purification.
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 method enables efficient, cost-effective, and high-specificity screening of polypeptide variants, capable of identifying polypeptides with desired activities, such as enhanced binding affinities, in a significantly reduced timeframe.
Implementation Method 1
expressing a polypeptide by coupled cell-free in vitro transcription-translation (IVT)
Implementation Method 2
expressing a polypeptide by coupled cell-free in vitro transcription-translation (IVT)
Implementation Method 3
determining the activity of the expressed polypeptide by solution equilibrium titration with an interaction member, wherein the activity is the binding affinity of the polypeptide to the interaction member
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The present invention relates to a method for screening the activity of a polypeptide, and, equally, for producing a polypeptide with a desired activity by said screening, in an efficient and cost effective manner and with high sensitivity. The methods of the present invention comprise (i) expressing a polypeptide by cell-free in vitro translation and (ii) determining the activity of the expressed polypeptide by solution titration with an interaction member. The screening of a wild-type polypeptide and a mutant library derived there from can be used for identifying a activity of these polypeptides to an interaction member as a consequence of one or more point mutations. Furthermore, the present invention relates to methods for identifying polypeptides with therapeutically relevant properties as a consequence of the identified desired activity of a polypeptide from a mutant library.