Viral Vector Cell Surface Antibody Display
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Solution Overview
Problem
Current methods for displaying antibodies on mammalian cells are limited by the size and diversity of libraries, particularly for whole antibody cell surface display, which hinders the identification of antibodies with modified Fc regions and altered effector functions.
Innovation Solution
A recombinant antibody system that displays antibodies or antibody fragments on the extracellular surface of mammalian cells using viral vectors, such as adenoviral vectors, allowing for the expression of full-length or fragment antibodies with targeted amino acid sequences for cell surface anchoring, enabling the screening of libraries for specific antigen binding and altered binding characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional methods are used for displaying antibodies on mammalian cells, then the library size and diversity are limited, but the complexity of the system increases
Solution Approach 1:
The antibody molecule is divided into separate heavy chain and light chain components, each expressed from independent nucleic acid sequences. The heavy chain contains a transmembrane domain for membrane anchoring, while the light chain is secreted. This segmentation allows independent optimization of each chain's expression and function, enabling larger library sizes without proportionally increasing system complexity.
Solution Approach 2:
The transmembrane domain serves multiple functions: it anchors the heavy chain to the cell membrane, facilitates proper folding and trafficking of the antibody fragment, and enables cell surface display. This multi-functionality reduces the need for additional specialized components, allowing expanded library diversity without linear increases in system complexity.
2Adaptability or versatility
If whole antibody cell surface display is implemented, then the ability to identify antibodies with modified Fc regions is improved, but the difficulty of expression and screening increases
Solution Approach 1:
The transmembrane domain is extracted from the conventional secreted antibody structure and inserted into the heavy chain. This extraction allows the antibody to be anchored to the cell surface while maintaining its full antigen-binding and Fc region functionality. The modified Fc regions can be screened by their natural interactions with Fc receptors on other cells, simplifying detection despite the added membrane anchoring complexity.
Solution Approach 2:
The transmembrane domain acts as an intermediary element that connects the soluble antibody molecule to the cell membrane without interfering with the antibody's native functions. This intermediary structure enables cell surface display of whole antibodies including modified Fc regions, while the natural Fc receptor interactions serve as the screening mechanism, reducing the need for complex artificial detection systems.
3Productivity
If viral vectors are used for antibody expression, then the productivity and speed of library generation are improved, but the safety and regulatory complexity increase
Solution Approach 1:
The patent uses transient expression systems where viral vectors are introduced into host cells for short-term antibody production and screening. The viral vectors and host cells serve as disposable tools for rapid library generation, after which they are discarded. This approach enables fast productivity without the need for permanent viral integration or complex regulatory approvals associated with long-term viral systems.
Solution Approach 2:
The expression parameters are optimized for rapid transient production rather than stable long-term expression. Viral vectors are used at high multiplicities of infection to achieve quick, high-level antibody expression within hours to days. This parameter change from stable to transient expression maximizes productivity while minimizing safety concerns and regulatory complexity associated with permanent viral modifications.
Data Source
AI summary
The present invention relates to a viral vector encoding for a library of antibodies or antibody fragments that are displayed on the cell membrane when expressed in a cell. The present invention provides cells comprising the viral vector nucleic acids and methods of screening the libraries for antibodies or antibody fragments with desired characteristics.