Fibroin Modifying Reagent Using Aromatic Groups for β-Sheet Binding
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Solution Overview
Problem
Fibroin proteins with β-sheet structures have limited sites for chemical modification, leading to difficulties in imparting desired functions due to steric hindrance from large molecular peptides and complex reaction processes.
Innovation Solution
A modifying reagent comprising a structure derived from biomolecules with an aromatic ring, such as benzothiazole, benzoxazole, or naphthylazo groups, is used to noncovalently or covalently bond to fibroin, facilitating functionalization through ionic, hydrogen, or intermolecular forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If large molecular peptides are used to impart functions to fibroin, then functional diversity is improved, but steric hindrance increases and modification efficiency deteriorates
Solution Approach 1:
The modifying reagent is divided into two distinct parts: a small aromatic ring group that binds to fibroin and a biomolecular structure that provides the desired function. This segmentation allows the reagent to overcome steric hindrance while maintaining functional diversity, as the small aromatic portion can access limited binding sites on fibroin without the bulk of the functional moiety interfering with the binding process.
Solution Approach 2:
The aromatic ring group acts as an intermediary between the fibroin protein and the biomolecular structure. It provides a small binding interface that can access limited sites on fibroin, while the biomolecular structure (enzyme, antibody, antigen, peptide, polynucleotide, oligonucleotide, ligand, enzyme substrate, biotin, or catecholamine) attached to it delivers the desired function, effectively mediating the connection between the protein scaffold and the functional element.
2Reliability
If covalent chemical modification is used to impart functions to fibroin, then functional stability is improved, but reaction time increases and operational complexity increases
Solution Approach 1:
The patent changes the chemical parameters of the modifying reagent by incorporating aromatic ring groups (benzothiazole, benzoxazole, benzimidazole, or naphthylazo) that have specific binding affinities for fibroin. These aromatic groups can form stable interactions (including π-π stacking, hydrophobic interactions, and hydrogen bonding) with the protein, providing functional stability without requiring lengthy covalent bond formation reactions, thus reducing reaction time and operational complexity.
3Reliability
If covalent chemical modification is used to impart functions to fibroin, then functional stability is improved, but process complexity increases
Solution Approach 1:
The aromatic ring group serves as an intermediary that simplifies the modification process. Its small size and specific binding characteristics allow it to attach to fibroin through relatively simple processes, while the attached biomolecular structure provides the desired function. This intermediary approach avoids the need for complex multi-step covalent modification procedures, reducing process complexity while maintaining functional stability.
4Ease of manufacture
If peptide adsorption is used to impart functions to fibroin, then ease of manufacture is improved, but steric hindrance increases due to large molecular size
Solution Approach 1:
The modifying reagent is segmented into a small aromatic ring portion and a functional biomolecular portion. The small aromatic ring can access limited binding sites on fibroin that would be inaccessible to larger peptide molecules, while the biomolecular structure attached to it provides the desired function. This segmentation resolves the contradiction between ease of manufacture and binding site accessibility.
Solution Approach 2:
Instead of using large peptide molecules that adsorb to fibroin, the patent uses a simplified model: a small aromatic ring group that mimics the binding capability of peptides but with much smaller size. This aromatic 'copy' can access binding sites that larger peptides cannot, while still enabling functionalization through the attached biomolecular structure.
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 modifying reagent effectively imparts desired functions to fibroin by enhancing adsorption and stability, allowing for efficient modification and functionalization of proteins with β-sheet structures.
Implementation Method 1
Aromatic compounds, such as dyes, are small in molecular size and can noncovalently adsorb more aromatic compounds to a protein
Implementation Method 2
facilitating functionalization through ionic, hydrogen, or intermolecular forces
Implementation Method 3
facilitating functionalization through ionic, hydrogen, or intermolecular forces
Data Source
AI summary
A purpose is to impart a function a protein having a β-sheet structure by using a material having a small molecular size. A modifying reagent for a protein having a β-sheet structure is provided, comprising a structure derived from a biomolecule and a group containing an aromatic ring, wherein the group containing the aromatic ring may has at least one selected from the group consisting of a benzothiazole group, a benzoxazole group, a benzimidazole group, and a naphthylazo group, each may have a substituent, the structure derived from the biomolecule includes a structure derived from one selected from a group consisting of an enzyme, an antibody, an antigen, a peptide, a polynucleotide, an oligonucleotide, a ligand, an enzyme substrate, a biotin, and a catecholamine.