pKM19 Phagemid Vector for Antibody Selection Efficiency
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Solution Overview
Problem
Current phage-display systems face difficulties in efficiently selecting and maturing recombinant antibodies from tumor-infiltrating lymphocyte-derived libraries due to imperfections in display vectors, leading to challenges in identifying specific antibodies recognizing tumor cells.
Innovation Solution
A novel phagemid vector, pKM19, is developed with modifications such as a suppressed stop codon, low-efficient promoter, and fusion with the carboxy-terminal part of the pIII protein, which reduces antibody expression levels and improves display efficiency, allowing for efficient selection and maturation of recombinant antibodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional phage-display vectors are used, then antibody expression levels are high, but selection efficiency and display quality are poor
Solution Approach 1:
The patent applies parameter changes by modifying the promoter strength from high-expression promoters to low-expression promoters (such as Ptrc or Plac with reduced activity). This changes the expression parameter to achieve optimal display quality and selection efficiency, resolving the contradiction between high productivity and high manufacturing precision in the phage-display system
Solution Approach 2:
The patent introduces dynamic control of antibody expression through inducible promoters and adjustable expression conditions. By using promoters that can be tuned or induced at specific stages, the system dynamically adjusts expression levels to optimize both selection efficiency and display quality at different phases of the selection process
2Quantity of substance
If high expression levels are maintained, then antibody production is high, but specific binder selection becomes difficult
Solution Approach 1:
The patent changes the expression parameter by using weak or inducible promoters that reduce background expression levels. This allows specific binders to be distinguished more clearly from non-specific binders during selection, improving measurement precision while maintaining sufficient antibody production through controlled expression
Solution Approach 2:
The patent applies preliminary action by pre-optimizing expression levels before the selection process begins. By establishing low baseline expression through promoter selection and only inducing expression when needed, the system prepares the optimal conditions for accurate binder selection while ensuring sufficient antibody is produced at the right time
Data Source
AI summary
It is described a vector suitable for efficient selection and/or maturation of a recombinant antibody characterized in that it contains at least one element able to reduce the expression level and/or has an improved efficiency of display of said recombinant antibody.