Circular Tandem Repeat Proteins Geometric Design
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Solution Overview
Problem
Current repeat proteins are limited in their geometric precision and stability for therapeutic, diagnostic, and nanotechnological applications due to their reliance on natural sequences and structures, lacking the ability to self-fold and maintain thermostability.
Innovation Solution
Designing circular tandem repeat proteins (cTRPs) purely by geometric criteria, resulting in self-folding, thermostable, and solubility-high proteins with repetitive alpha-helical structures and constrained inter-repeat packing geometry, allowing for precise presentation of cell-signaling and immune-related epitopes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If repeat proteins are designed based on natural sequences and structures, then they can be produced using existing biological systems, but they lack geometric precision and thermostability
Solution Approach 1:
The patent changes the fundamental design parameters from natural sequence-based design to geometric criteria-based design. By specifying precise geometric parameters (repeat unit dimensions, packing angles, circular arrangement constraints), the invention achieves high geometric precision while maintaining ease of manufacture through de novo protein design methods that follow defined geometric rules rather than natural sequence templates.
Solution Approach 2:
The patent inverts the traditional design approach by starting with the desired geometric structure and working backward to determine the amino acid sequence, rather than starting with natural sequences and observing the resulting structure. This inversion enables precise control over geometric parameters while simplifying the manufacturing process through rational design.
2Reliability
If repeat proteins use natural structures, then they can fold using natural pathways, but they cannot maintain high thermostability and self-folding capability
Solution Approach 1:
The patent applies preliminary action by pre-designing the folding pathway through geometric constraints. The circular tandem repeat architecture with defined packing geometry is established before protein expression, ensuring that the protein will self-fold correctly upon translation. This pre-established geometric framework guides the folding process and ensures thermostability without requiring post-translational adjustments.
Solution Approach 2:
The patent enables self-service by designing proteins that automatically self-fold into the correct circular tandem repeat structure without requiring chaperones or other cellular machinery. The geometric constraints and packing parameters are built into the sequence design, allowing the protein to autonomously achieve its stable, thermostable conformation through intrinsic folding forces.
3Adaptability or versatility
If cTRPs incorporate functional domains, then they gain therapeutic and diagnostic utility, but it may alter their engineered geometric parameters
Solution Approach 1:
The patent applies segmentation by dividing the protein into distinct modular components: the circular tandem repeat scaffold and the functional domains. The scaffold maintains its geometric integrity as a separate module, while functional domains are attached as independent units. This segmentation allows functional domains to be incorporated without disrupting the precise geometric parameters of the cTRP core structure.
Solution Approach 2:
The patent applies local quality by allowing different regions of the protein to have different properties. The circular tandem repeat scaffold maintains its engineered geometric precision and structural rigidity, while the attached functional domains can vary in sequence and function. This local differentiation enables functional versatility without compromising the overall geometric parameters of the scaffold.
Data Source
AI summary
Circular handed alpha-helical repeat proteins are described. The repeat proteins have a number of uses as scaffolds for geometrically precise, arrayed presentation of cell-signaling or immune-related protein and peptide epitopes, as well as numerous other therapeutic, diagnostic, and nanotechnological uses.