Thermophilic Maltose Binding Protein Scaffold for Enzyme Domain Insertion
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Solution Overview
Problem
Conventional methods for stabilizing proteins often compromise their activity and specificity through mutations or chemical modifications, and lack a general strategy for enhancing stability without altering the primary sequence, especially for proteins with discontinuous catalytic domains.
Innovation Solution
The method involves inserting a target protein domain into a thermophilic scaffold protein, specifically using a maltodextrin-binding protein from Pyrococcus furiosus, to create a fusion protein that maintains the target protein's activity and specificity while enhancing its stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If mutations or chemical modifications are used to stabilize proteins, then stability is improved, but activity and specificity are compromised
Solution Approach 1:
The invention divides the protein stabilization problem into two separate components: a stable thermophilic scaffold protein and a target protein domain with desired activity. The scaffold provides stability while the target domain retains its native sequence and function, resolving the contradiction between stability and activity preservation.
Solution Approach 2:
The target protein domain is inserted into the structure of the thermophilic scaffold protein, creating a fusion where the stable scaffold encompasses the target domain. This nesting allows the target domain to maintain its native properties while being protected by the stable scaffold structure.
2Stability of the object's composition
If rational design with mutations is employed to enhance stability, then stability is improved, but the primary sequence is modified
Solution Approach 1:
The invention extracts only the stable structural framework from thermophilic proteins while leaving the target protein's primary sequence intact. The target domain is inserted into the scaffold without mutating its own residues, preserving its native sequence while gaining stability from the scaffold.
Solution Approach 2:
The thermophilic scaffold protein serves multiple functions: providing structural stability, protecting the target domain, and enabling the target protein to function under conditions it could not withstand alone. The scaffold acts as a universal stabilizing platform for different target domains.
3Stability of the object's composition
If conventional stabilization methods are used, then stability is improved, but the solution lacks generality for different protein types
Solution Approach 1:
The thermophilic scaffold protein serves as a universal stabilizing platform that can accommodate different target protein domains through insertion. This multi-functional approach allows the same scaffold to stabilize various different proteins, providing a general solution applicable to diverse protein types.
Solution Approach 2:
The thermophilic scaffold acts as an intermediary between the unstable target protein and the stable environment needed for its function. The scaffold mediates stability without requiring modifications to the target protein's primary sequence, making the approach broadly applicable.
Data Source
AI summary
A strategy to improve protein stability by domain insertion. TEM 1 beta-lactamase (BLA) and exo-inulinase, as model target enzymes, are inserted into a hyperthermophilic maltose binding protein from Pyrococcus furiosus (PfMBP). Unlike conventional protein stabilization methods that employ mutations and recombinations, the inventive approach does not require any modification on a target protein except for its connection with a hyperthermophilic protein scaffold. For that reason, target protein substrate specificity was largely maintained, which is often modified through conventional protein stabilization methods. The insertion was achieved through gene fusion by recombinant DNA techniques.