FN3 Monobody Stability via Loop Mutations
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Solution Overview
Problem
Current strategies for producing FN3-based binding proteins are limited by their stability and efficiency, necessitating the development of improved methods for generating novel binding proteins with enhanced stability properties.
Innovation Solution
The development of polypeptides comprising variant fibronectin type III (FN3) domains from Sulfolobus tokodaii and Pyrococcus horikoshii, featuring amino acid substitutions, insertions, or deletions in loop regions or non-loop regions, to enhance stability and binding affinity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional FN3-based binding proteins are used, then they can be readily expressed in bacterial systems and lack disulfide bonds, but they exhibit limited stability and reduced binding affinity
Solution Approach 1:
The patent applies parameter changes by modifying amino acid sequences in the FN3 scaffold, specifically introducing substitutions, insertions, or deletions in loop regions and non-loop regions to enhance thermal stability and binding affinity while maintaining bacterial expressibility
Solution Approach 2:
The patent creates composite protein structures by combining the FN3 scaffold with stabilized variants that have enhanced thermal properties, resulting in a hybrid binding protein that maintains the advantages of the original scaffold while improving stability
2Reliability
If FN3 variants with enhanced stability are developed through amino acid substitutions and insertions, then binding affinity and stability are improved, but the complexity of protein engineering increases
Solution Approach 1:
The patent applies local quality by targeting specific loop regions and non-loop regions of the FN3 domain for amino acid modifications, rather than random mutagenesis throughout the entire protein, thereby improving binding affinity and stability with focused engineering efforts
Solution Approach 2:
The patent employs dynamic engineering strategies where combinatorial libraries are generated and screened to identify optimal variants, allowing the engineering process to adapt and evolve based on observed binding and stability characteristics
Data Source
AI summary
The current application describes various compositions and methods for the production of FN3-based binding proteins with improved stability properties. Aspects of the disclosure relate to polypeptides comprising a variant fibronectin type III (FN3) domain from Sulfolobus tokodaii or Pyrococcus horikoshii comprising one or more amino acid substitutions or insertions in a loop region of FN3, in a non-loop region of FN3, or in both.