Polypeptides for Self-Assembling Icosahedral Nanostructures
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Solution Overview
Problem
The development of self-assembling proteins for advanced functional materials has progressed slowly, despite their attractive functional and physical properties, due to challenges in designing effective nanostructures with high symmetry and stability.
Innovation Solution
Isolated polypeptides with specific amino acid sequences, designed for at least 75% identity over their length and at identified interface positions, are used to form nanostructures through non-covalent interactions, enabling the creation of symmetric supramolecular complexes with icosahedral symmetry, which can encapsulate and protect nucleic acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-assembling proteins are designed to form highly ordered symmetric supramolecular complexes, then the functional and physical properties are improved, but the development progress is slow due to design challenges
Solution Approach 1:
The protein design is divided into distinct functional segments: a stable foldon domain for structural integrity, and variable C-terminal regions for controlling assembly behavior. This segmentation allows independent optimization of stability and assembly properties, resolving the contradiction between reliable nanostructure formation and design complexity.
Solution Approach 2:
The invention systematically varies key parameters including the length of C-terminal extensions (1-30 amino acids), composition of terminal residues (hydrophobic, charged, polar), and folding kinetics to tune assembly behavior. This parameter-based approach enables predictable control over nanostructure formation while maintaining design simplicity.
2Shape
If proteins are designed with specific amino acid sequences for high symmetry, then symmetric supramolecular complexes are formed, but the design process is challenging and slow
Solution Approach 1:
The foldon domain autonomously folds into a stable beta-sandwich structure that inherently provides structural symmetry and stability. This self-folding capability eliminates the need for complex external design constraints, allowing symmetric nanostructures to form naturally through self-assembly while simplifying the overall design process.
Solution Approach 2:
The foldon domain serves multiple functions simultaneously: providing structural stability, enabling symmetric assembly, and serving as a scaffold for diverse C-terminal modifications. This multi-functionality allows a single core domain to support various symmetric nanostructure configurations without increasing design complexity.
3Stability of the object's composition
If polypeptides are designed with at least 75% identity and specific interface positions, then stable nanostructures with icosahedral symmetry are formed, but the manufacturing precision requirements increase
Solution Approach 1:
The invention applies different quality requirements to different regions: the foldon core domain maintains high sequence identity (75% or greater) for structural stability, while the C-terminal regions allow greater variability (1-30 amino acids) for tuning assembly properties. This local differentiation of quality requirements reduces overall manufacturing precision constraints while maintaining nanostructure stability.
Solution Approach 2:
Instead of requiring complete sequence identity across the entire polypeptide, the invention applies identity thresholds selectively - 75% or greater identity is required only for the critical foldon domain and interface positions, while C-terminal regions can vary more extensively. This partial application of strict identity requirements maintains stability without imposing excessive precision constraints throughout the entire sequence.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The designed nanostructures effectively self-assemble into stable, symmetric complexes that can encapsulate and protect nucleic acids, demonstrating potential for applications in targeted drug delivery and vaccine design by forming well-packed cores with hydrophobic and hydrophilic interfaces.
Implementation Method 1
Molecular self- and co-assembly of proteins into highly ordered, symmetric supramolecular complexes
Implementation Method 2
the plurality of first assemblies non-covalently interact with the plurality of second assemblies to form a nanostructure
Implementation Method 3
forming well-packed cores with hydrophobic and hydrophilic interfaces
Data Source
AI summary
Synthetic nanostructures, polypeptides that are useful, for example, in making synthetic nanostructures, and methods for using such synthetic nanostructures are disclosed herein.