Fusion Proteins with Cry Protein for Industrial Enzyme Stability
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Solution Overview
Problem
Enzymes used in industrial synthesis are costly due to the need for frequent replacement to maintain reaction efficiency, particularly in high-temperature and organic solvent conditions, limiting their recyclability and commercial viability.
Innovation Solution
Development of fusion proteins comprising an enzyme fused with a Cry protein or crystal-forming fragment, which enhances stability and recyclability by forming crystals, allowing for prolonged activity in elevated temperatures and organic solvents, such as methanol and ethanol, with minimal loss of enzymatic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If enzymes are used in industrial synthesis at high temperatures and in organic solvents, then reaction efficiency is maintained initially, but enzyme stability and recyclability deteriorate rapidly requiring frequent replacement
Solution Approach 1:
The patent merges an enzyme with a Cry protein to create a fusion protein. The Cry protein domain is fused to the enzyme, creating a single polypeptide chain that combines the catalytic function of the enzyme with the crystal-forming and stabilizing properties of the Cry protein. This merging resolves the contradiction by providing both initial reaction efficiency (from the enzyme) and enhanced stability/recyclability (from the Cry protein fusion).
Solution Approach 2:
The fusion protein represents a composite structure at the molecular level, combining two different protein domains (enzyme and Cry protein) into a single functional unit. The enzyme domain provides catalytic activity while the Cry protein domain provides structural stability and crystal formation capability. This composite approach allows the enzyme to maintain activity under harsh industrial conditions (high temperature, organic solvents) while being recyclable, thus resolving the stability-recyclability contradiction.
2Productivity
If enzymes are replaced frequently to maintain reaction efficiency, then optimal performance is achieved, but operational costs increase significantly
Solution Approach 1:
The Cry protein fusion enables the enzyme to maintain continuous useful action over multiple reaction cycles. The crystal-forming Cry protein domain allows the fusion protein to remain stable and active in harsh conditions (high temperature, organic solvents) without denaturation or aggregation, enabling reuse across multiple batches. This continuity eliminates the need for frequent replacement, maintaining productivity while reducing operational costs associated with enzyme replacement.
3Adaptability or versatility
If enzymes are exposed to organic solvents and high temperatures, then industrial synthesis requirements are met, but enzyme activity is rapidly lost
Solution Approach 1:
The patent merges an enzyme with a Cry protein to create a fusion protein. The Cry protein domain is fused to the enzyme, creating a single polypeptide chain that combines the catalytic function of the enzyme with the crystal-forming and stabilizing properties of the Cry protein. This merging resolves the contradiction by providing both initial reaction efficiency (from the enzyme) and enhanced stability/recyclability (from the Cry protein fusion).
Solution Approach 2:
The fusion protein represents a composite structure at the molecular level, combining two different protein domains (enzyme and Cry protein) into a single functional unit. The enzyme domain provides catalytic activity while the Cry protein domain provides structural stability and crystal formation capability. This composite approach allows the enzyme to maintain activity under harsh industrial conditions (high temperature, organic solvents) while being recyclable, thus resolving the stability-recyclability contradiction.
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 fusion proteins exhibit significantly improved stability and recyclability, retaining at least 75% of their initial activity after solvent and heat treatment, enabling multiple reaction cycles with maintained performance, thus reducing costs and enhancing commercial potential in industrial applications.
Implementation Method 1
the fusion protein is capable of self-crystalizing or spontaneously forming crystals once it is expressed within a cell
Data Source
AI summary
It provides novel fusion proteins that are capable of self-crystallization and exhibit improved physical properties such as enhanced tolerance to organic solvents and increased thermostability. Polynucleotides encoding the fusion proteins as well as methods of making and using such fusion proteins are also described.