Conformationally-Constrained Helicases for Enhanced DNA Unwinding
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Solution Overview
Problem
Current helicases have limitations in terms of unwinding activity and stability, which hampers their efficiency in biotechnological applications such as DNA amplification and sequencing.
Innovation Solution
Development of conformationally-constrained helicases by covalently crosslinking specific subdomains, such as the 2B domain to the 1A or 1B domain in Rep helicases, to maintain a closed active conformation, thereby enhancing unwinding activity and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If helicases are used for DNA unwinding in biotechnological applications, then DNA amplification and sequencing can be performed, but the unwinding activity and stability are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the conformational state of the helicase through covalent crosslinking. Specifically, crosslinking the 2B domain to the 1A or 1B domain locks the helicase in a closed active conformation, fundamentally changing its structural parameter to achieve enhanced stability and unwinding activity simultaneously
Solution Approach 2:
The patent creates a composite structure by forming covalent bonds between previously separate domains (2B to 1A or 1B) of the helicase protein. This composite approach integrates multiple functional domains into a unified, crosslinked structure that maintains both stability and high unwinding activity
2Strength
If conventional helicases are used, then basic DNA unwinding function is achieved, but they cannot withstand high forces and unwind long DNA sequences efficiently
Solution Approach 1:
The patent changes the mechanical parameters of the helicase by introducing covalent crosslinks that rigidify the protein structure. This increases the force resistance capability while maintaining the dynamic conformational changes needed for efficient DNA unwinding, allowing the helicase to withstand higher forces and process longer DNA sequences
3Productivity
If the helicase conformation is constrained to remain closed, then unwinding activity and strength are enhanced, but the structural complexity increases
Solution Approach 1:
The patent achieves enhanced unwinding activity by changing the conformational parameter of the helicase through covalent crosslinking. While this does increase structural complexity, the crosslinking approach provides a straightforward method to lock the active conformation without requiring complex multi-component systems or additional regulatory mechanisms
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 modified helicases exhibit significantly enhanced unwinding activity and strength, capable of unwinding longer DNA sequences and withstanding higher forces, making them more suitable for applications like isothermal PCR and next-generation sequencing.
Implementation Method 1
catalyzes the reaction of separating/unzipping/unwinding the helical structure of nucleic acid duplexes (DNA, RNA or hybrids) into single-stranded components, using nucleoside triphosphate (NTP) hydrolysis as the energy source (such as ATP)
Implementation Method 2
covalently crosslinking the 2B domain to the 1A domain or the 1B domain in a Rep helicase
Data Source
AI summary
Conformationally-constrained helicases having improved activity and strength are provided. Methods of making conformationally-constrained helicases having improved activity and strength are provided. Methods of using conformationally-constrained helicases having improved activity and strength are provided.