Mussel Foot Protein Oligomers via Split Intein Polymerization
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Solution Overview
Problem
Current synthetic adhesives and materials fail to replicate the strong underwater adhesion properties of mussel foot proteins (Mfps), particularly Mfp5, which are essential for various applications including surgical and medical uses due to their unique multi-scale assembly and interactions.
Innovation Solution
A microbial-based approach is developed to produce covalently linked Mfp5 oligomers by fusing N-terminal and C-terminal split inteins to Mfp sequences, resulting in high molecular weight proteins with enhanced adhesion properties, utilizing E. coli expression systems and post-translational modification to achieve robust underwater adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If synthetic adhesives are used to replicate mussel foot protein properties, then manufacturing cost and ease of production are improved, but adhesion strength and reliability underwater deteriorate
Solution Approach 1:
The patent modifies the molecular weight parameter of Mfp5 by using split intein-mediated polymerization to create high molecular weight oligomers (HMW-Mfp5). This parameter change transforms the adhesive properties, enabling strong underwater adhesion that synthetic adhesives cannot achieve, while still allowing microbial production
2Strength
If high molecular weight Mfp5 is produced to enhance adhesion properties, then adhesion strength is improved, but production complexity and difficulty of manufacturing increase
Solution Approach 1:
The split intein system enables self-assembly of Mfp5 oligomers through spontaneous protein splicing. The IntN and IntC fragments automatically ligate to form full-length Mfp5 chains, which then self-assemble into high molecular weight oligomers. This self-service mechanism eliminates the need for complex external assembly equipment or multi-step purification processes
Solution Approach 2:
The patent performs preliminary action by fusing split intein fragments to Mfp5 sequences during the expression stage. The IntN and IntC are pre-positioned on separate Mfp5 chains, so that when the proteins are mixed, the splicing and oligomerization occur automatically without requiring additional assembly steps later in the process
3Strength
If DOPA-based interactions are used for surface adhesion, then adhesion capability is improved, but susceptibility to oxidation and stability deteriorate
Solution Approach 1:
The patent creates a composite adhesive system where HMW-Mfp5 combines multiple adhesion mechanisms: DOPA-based interactions (hydrogen bonding, metal complexation, hydrophobic interactions) work together with physical chain entanglements and covalent crosslinks from intein-mediated polymerization. This composite approach maintains the strong adhesion capability of DOPA while the high molecular weight and multiple interaction types provide redundancy that improves stability and resistance to oxidation
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 produced Mfp5 oligomers exhibit higher underwater adhesion forces and adhesion work compared to previous reports, demonstrating improved adhesive capabilities suitable for diverse applications such as surgical glues and underwater repairs.
Implementation Method 1
fusing N-terminal and C-terminal split inteins to Mfp sequences, resulting in high molecular weight proteins with enhanced adhesion properties
Implementation Method 2
Mfp5 chains can adhere to various surfaces via multiple types of interactions, e.g., bidentate hydrogen bonding and metal complexation
Implementation Method 3
Mfp5 chains can adhere to various surfaces via multiple types of interactions, e.g., bidentate hydrogen bonding and metal complexation
Implementation Method 4
Mfps have varying levels of 3,4-dihydroxyphenylalanine (DOPA), which arise from post-translational modification of tyrosine residues by tyrosinases
Implementation Method 5
Mfp5 can also cohesively interact with neighboring chains via bi-DOPA hydrogen bonding, aryloxyl radicalization crosslinking, and physical chain entanglements
Data Source
AI summary
Mussels strongly adhere to a variety of surfaces by secreting byssal threads that contain mussel foot proteins (Mfps). Recombinant production of Mfps presents an attractive route for preparing advanced adhesive materials. Using synthetic biology strategies, Mfp5 together with Mfp5 oligomers containing two or three consecutive, covalently-linked Mfp5 sequences (named Mfp52 and Mfp53) were synthesized. Positive correlations were found between Mfp5 molecular weight and underwater adhesive properties, including adhesion force, adhesion work, protein layer thickness, and recovery distance. Dopa-modified Mfp53 displayed a high adhesion force (201±36 nN μm−1) and a high adhesion work (68±21 fJ μm−1) for 200 s cure times, higher than previously reported Mfp-mimetic adhesives. Results disclosed herein highlight the power of synthetic biology in producing biocompatible and highly adhesive Mfp-based materials.