Genetically Encoded Peptide Tags for Nanoprotein Assembly
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Solution Overview
Problem
Current methods for conjugating semiconductor nanocrystals with biological molecules, such as proteins, are limited in scalability, cost-effectiveness, and stability, particularly in forming robust and fluorescent self-assembling biopolymer scaffolds for nanotechnology and biological applications.
Innovation Solution
The development of genetically engineered biopolymers, such as amyloid fibrils, that use peptide tags and linkers like SpyTag-SpyCatcher or isopeptag-pilin-C for irreversible isopeptide bonding with semiconductor nanoparticles, enabling the formation of scalable, low-cost, and highly fluorescent self-assembling structures like micron-level chains and heterostructures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbodiimide crosslinker chemistry (EDC/NHS) is used to attach QDs with proteins, then amide bond formation occurs between terminal carboxyls on QD ligands and amines on proteins, but the conjugation methods are limited in scalability and cost-effectiveness
Solution Approach 1:
The biopolymer scaffold system enables self-assembly of nanoparticle conjugates through genetically encoded peptide tags (e.g., SpyTag, pilin-C) that automatically bind to their complementary proteins (e.g., CnaB2 domain, pilin-N) without requiring external crosslinking reagents. This self-service mechanism eliminates the need for carbodiimide chemistry and enables scalable production through recombinant cell expression
Solution Approach 2:
Peptide tags serve as intermediary elements that mediate the binding between nanoparticles and biopolymers. The SpyTag-SpyCatcher or pilin-C-pilin-N pairs act as specific mediators that facilitate reliable conjugation while enabling scalable production through genetic encoding in recombinant cells
2Reliability
If conventional conjugation methods are used, then QD-biomolecule conjugates can be formed, but the methods are limited in cost-effectiveness and production efficiency
Solution Approach 1:
The system uses self-assembling biopolymer scaffolds with genetically encoded peptide tags that automatically conjugate to nanoparticles without requiring expensive chemical crosslinkers. Recombinant cells produce the biopolymers at scale, significantly reducing manufacturing costs while maintaining conjugate stability
Solution Approach 2:
The invention changes the chemical parameters of conjugation by replacing carbodiimide crosslinker chemistry with genetically encoded peptide-protein binding. This parameter change enables cost-effective large-scale production through biological manufacturing while maintaining reliable conjugation
3Reliability
If carbodiimide crosslinker chemistry is used for QD-protein attachment, then conjugation can be achieved, but robust and fluorescent self-assembling biopolymer scaffolds are difficult to produce at scale
Solution Approach 1:
Biopolymer scaffolds with genetically encoded peptide tags self-assemble with nanoparticle conjugates through specific protein-peptide binding. This self-assembly mechanism produces robust, fluorescent scaffolds at scale using recombinant cell expression, eliminating the need for manual conjugation procedures
Solution Approach 2:
The peptide tags are genetically encoded into the biopolymer sequence beforehand, preparing the scaffold for automatic self-assembly with nanoparticle conjugates. This preliminary action enables scalable production by pre-configuring the binding capability during biopolymer synthesis in recombinant cells
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
This approach allows for the creation of robust, scalable, and cost-effective self-assembling biopolymer scaffolds that facilitate the patterning of functional nanomaterials for light harvesting and emitting devices, as well as biological applications, with enhanced stability and fluorescence properties.
Implementation Method 1
irreversible isopeptide binding of the peptide tags to the proteins of the conjugates
Implementation Method 2
biopolymers largely composed of protein subunits that self-assemble in the extracellular space
Implementation Method 3
high photoluminescence quantum yield, narrow and symmetric photoluminescence spectra
Data Source
AI summary
Various aspects and embodiments provided herein are directed to compositions that include at least one nanoparticle linked to a first polypeptide, and a biologically synthesizable polymer linked to at least one second polypeptide that binds covalently to the first polypeptide. Other aspects and embodiments provided herein are directed to methods of producing the foregoing compositions and components therein.