Phage Display Screening for Soluble Monomeric Antibody Fragments
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for isolating and manipulating monomeric human antibody fragments face challenges such as aggregation, low solubility, and immunogenicity, limiting their application in immunotherapy and diagnostics.
Innovation Solution
A high-throughput screening method using phage display libraries to identify and characterize monomeric human VH and VL fragments with improved biophysical properties, such as solubility, stability, and resistance to proteases, which can be further manipulated through DNA shuffling for enhanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If human VH and VL fragments are used for immunotherapy applications, then immunogenicity is reduced, but aggregation and low solubility occur
Solution Approach 1:
The patent uses phage display technology to screen and identify human VH and VL fragments with optimized biophysical properties. By displaying fragments on phage surfaces and selecting for soluble, non-aggregating variants, the method identifies sequences that maintain human origin (low immunogenicity) while achieving improved solubility and stability characteristics
Solution Approach 2:
The patent replaces traditional mechanical separation and purification methods with a biological selection system. Phage display libraries allow in vivo selection of functional fragments through biological interactions, where phage displaying soluble, stable fragments preferentially infect and propagate in host bacteria, automatically enriching for desirable biophysical properties without complex mechanical separation steps
2Device complexity
If conventional isolation methods are used for monomeric antibody fragments, then simplicity is maintained, but productivity and isolation efficiency are low
Solution Approach 1:
The patent implements a continuous high-throughput screening process using phage display libraries. The method maintains continuous flow of phage through bacterial hosts, enabling constant selection and amplification of functional fragments. This continuous biological processing significantly increases isolation efficiency compared to batch processing methods while maintaining procedural accessibility
Solution Approach 2:
The patent uses phage as viral vectors to copy and propagate selected VH and VL sequences. Once functional fragments are identified through screening, their genetic information is replicated within phage particles and host bacteria, enabling rapid amplification and production of large quantities of the desired monomeric antibody fragments with high fidelity
3Productivity
If phage display libraries are used for screening, then productivity and isolation efficiency are improved, but device complexity and screening process complexity increase
Solution Approach 1:
The patent employs phage display technology as a universal platform that simultaneously achieves multiple functions: library construction, fragment display, high-throughput screening, sequence amplification, and functional selection all in one integrated system. This multi-functional approach increases productivity while consolidating complexity into a single versatile methodology rather than requiring separate steps for each function
4Stability of the object's composition
If DNA shuffling is used to enhance properties, then biophysical properties such as solubility and stability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent performs DNA shuffling and sequence optimization in advance during the library construction and screening phase. By pre-engineering fragments with improved solubility and stability characteristics through in vitro recombination and selection before production, the method achieves enhanced biophysical properties while simplifying downstream manufacturing, as the optimized sequences are already validated for functionality
Data Source
AI summary
Polypeptides with biophysical properties such as solubility, stability, high expression, monomericity, binding specificity or non-aggregation, including monomeric human heavy and light chain variable domains (VHs and VLs), are identified using a high throughput method for screening polypeptides, comprising the steps of obtaining a phage display library, allowing infection of a bacterial lawn by the library phage, and identifying phage which form larger than average plaques on the bacterial lawn. Sequences of monomeric human VHs and VLs are identified, which may be useful for immunotherapy or as diagnostic agents. Multimer complexes of human VHs and VLs are also identified. The VHs and VLs identified may be used to create further libraries for identifying additional polypeptides. Further, the VHs and VLs may be subjected to DNA shuffling to select for improved biophysical properties.