In vitroEvolution of Antibody Affinity via Insertional Mutagenesis Scanning of an Entire Antibody Variable Region
| Autor: | Bojana Popovic, Matthieu Chodorge, John Andrews, Kalliopi Skamaki, Stéphane Emond, Florian Hollfelder, Ralph Minter, Daniel Cannon, D. Gareth Rees, Andrew Buchanan |
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| Rok vydání: | 2020 |
| Předmět: |
Transposable element
0303 health sciences 010304 chemical physics Point mutation food and beverages Mutagenesis (molecular biology technique) Computational biology Biology 01 natural sciences Insertional mutagenesis 03 medical and health sciences 0103 physical sciences Ribosome display Indel Gene Systematic evolution of ligands by exponential enrichment 030304 developmental biology |
| Popis: | We report the first systematic combinatorial exploration of affinity enhancement of antibodies by insertions and deletions (InDels). Transposon-based introduction of InDels via the method TRIAD was used to generate large libraries with random in-frame InDels across the entire scFv gene that were further recombined and screened by ribosome display. Knowledge of potential insertion points from TRIAD libraries formed the basis of exploration of length and sequence diversity of novel insertions by insertional-scanning mutagenesis (ISM). An overall 256-fold affinity improvement of an anti-IL-13 antibody BAK1 as a result of InDel mutagenesis and combination with known point mutations validates this approach and suggests that the results of this InDel approach and conventional exploration of point mutations can synergize to generate antibodies with higher affinity.SignificanceInsertion/deletion (InDel) mutations play key roles in genome and protein evolution. Despite their prominence in evolutionary history, the potential of InDels for changing function in protein engineering by directed evolution remains unexplored. Instead point mutagenesis is widely used. Here we create antibody libraries containing InDels and demonstrate that affinity maturation can be achieved in this way, establishing an alternative to the point mutation strategies employed in all previous in vitro selections. These InDels mirror the observation of considerable length variation in loops of natural antibodies originating from the same germline genes and be combined with point mutations, making both natural sources of functional innovation available for artificial evolution in the test tube. |
| Databáze: | OpenAIRE |
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