Error-Prone Orthogonal Replication for Protein Engineering
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Solution Overview
Problem
Current protein engineering methods, such as yeast surface display (YSD), face limitations due to low transformation efficiency and labor-intensive processes, which hinder the development of designer proteins with desired characteristics and functions, particularly in achieving strong binding affinities and scalability.
Innovation Solution
The use of a P1 plasmid with a constitutively active promoter, secretory leader sequence, and attachment sequence, combined with error-prone orthogonal replication, enables the surface display and continuous evolution of proteins in yeast cells, allowing for the selection of proteins with desired characteristics without the need for extensive in vitro mutagenesis and yeast cell transformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional yeast surface display is used for protein engineering, then protein expression and surface display are achieved, but transformation efficiency is low and the process is labor-intensive
Solution Approach 1:
The patent combines orthogonal replication system with yeast surface display by integrating P1 plasmid replication machinery into yeast cells. This merging allows the yeast to replicate foreign DNA autonomously through error-prone orthogonal replication, eliminating the need for repeated manual transformation and DNA extraction steps, thereby significantly improving transformation efficiency and reducing process complexity
Solution Approach 2:
The orthogonal replication system enables the yeast cells to self-replicate the foreign protein coding sequences autonomously through error-prone replication. The P1 plasmid replicase machinery performs replication without requiring external intervention, reducing the labor-intensive manual steps of DNA extraction, PCR amplification, and re-transformation while maintaining high transformation efficiency
2Reliability
If multiple rounds of directed evolution are performed to achieve strong binding affinities, then protein binding affinity is improved, but the number of steps and time required increases
Solution Approach 1:
The error-prone orthogonal replication system enables continuous in vivo evolution of protein binders through multiple replication cycles. The system maintains a living library of mutants within the yeast population, allowing continuous selection and enrichment of high-affinity binders without the need to restart from scratch after each round, thereby reducing the time required for affinity maturation while maintaining high binding affinity
Solution Approach 2:
The system performs preliminary diversification of the protein library through error-prone replication before selection. By pre-generating a diverse population of mutants through autonomous replication, the system prepares multiple potential high-affinity binders in advance, reducing the time needed for subsequent selection rounds and accelerating the overall affinity maturation process
3Ease of manufacture
If extensive in vitro mutagenesis and yeast cell transformations are performed, then protein engineering is achieved, but scalability is limited
Solution Approach 1:
The patent replaces mechanical manual operations (DNA extraction, PCR amplification, plasmid preparation, and repeated transformation) with an autonomous biological replication system. The error-prone orthogonal replication machinery performs mutagenesis and protein expression in vivo, eliminating the need for labor-intensive in vitro steps and enabling scalable protein engineering that can be performed by multiple researchers simultaneously
Data Source
AI summary
Disclosed herein are methods, compositions, and kits for engineering proteins using error-prone orthogonal replication (epOrthoRep) and yeast surface display (YSD).