Engineered Phi29 DNA Polymerase for Thermostability and Expression Yield
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Solution Overview
Problem
Native Phi29 DNA polymerase has limitations in thermostability, expression yield, and compatibility with manufacturing and diagnostic workflows, limiting its performance and utility in biotechnological applications.
Innovation Solution
Engineering Phi29 DNA polymerase variants with specific amino acid substitutions, such as A83S, N91I, R96H, and others, to enhance thermostability, activity, and expressivity, resulting in improved DNA polymerases with higher yield, solubility, and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If native Phi29 DNA polymerase is used, then high processivity and proofreading capability are achieved, but thermostability and expression yield are limited
Solution Approach 1:
The patent applies parameter changes by systematically modifying amino acid residues at specific positions (e.g., positions 83, 91, 96, 108, 111, 113, 118, 122, 126, 127, 134, 145, 147, 149, 171, 173, 178, 179, 180, 181, 182, 186, 197, 200, 215, 220, 232, 336, 341, 349, 368, 398, 560) to improve thermostability while preserving the enzyme's proofreading capability and processivity. This involves changing physical-chemical parameters of the protein structure through site-directed mutagenesis.
2Duration of action of moving object
If native Phi29 DNA polymerase is used, then high processivity is achieved, but expression yield and solubility are limited
Solution Approach 1:
The patent modifies expression parameters by introducing amino acid substitutions that enhance solubility and expression yield without compromising the enzyme's high processivity. Specific substitutions at surface-exposed residues improve protein folding and stability during expression, increasing yield while maintaining the continuous DNA synthesis capability.
3Adaptability or versatility
If native Phi29 DNA polymerase is used, then isothermal amplification capability is achieved, but compatibility with manufacturing workflows is limited
Solution Approach 1:
The patent optimizes manufacturing parameters by engineering variants with improved stability and consistency that are more compatible with standardized manufacturing workflows. The amino acid substitutions enhance batch-to-batch reproducibility and stability under various storage and processing conditions, facilitating integration into GMP-compliant manufacturing processes while retaining isothermal amplification functionality.
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 engineered DNA polymerases exhibit enhanced thermostability, solubility, and higher yield, enabling more efficient DNA amplification and broader application in biotechnological processes like whole genome amplification and nucleic acid diagnostics.
Implementation Method 1
DNA polymerases are essential enzymes responsible for the synthesis and replication of DNA
Implementation Method 2
Thermostable DNA polymerase withstand repeated heating during thermal cycles without requiring replenishment
Implementation Method 3
The enzyme's intrinsic 3′ to 5′ exonuclease activity provides high replication fidelity
Implementation Method 4
Phi29 DNA polymerase is a high-performance enzyme widely used in biotechnology for its strong strand displacement activity
Data Source
AI summary
In an aspect, provided is a DNA polymerase with an amino acid sequence of at least 80% sequence identity with SEQ ID NO: 1 and having one or more amino acid substitution, wherein the one or more amino acid substitution is selected from the group consisting of A83S, N91I, R96H, R96C, M97V, G108D, G111V, R113H, V118S, S122N, L126I, P127L, A134T, D145V, D145N, D147V, H149R, H149L, Q171L, Q171S, I173V, L178K, I179L, Q180M, F181L, K182D, D186T, G197S, D200K, S215P, K220N, V222I, W232Y, M336L, D341K, D341I, D341L, S349R, S349G, T368Y, D398I, V399R, Q560H, and any combination of two or more of the foregoing. Also provided are a kit including the polymerase, a polynucleotide encoding the polymerase, a method of synthesizing a polynucleotide using the polymerase, and a method of sequence a polynucleotide synthesized by the polynucleotide.