Recombinant Polymerase Tuning for Accurate Single-Molecule Sequencing
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Solution Overview
Problem
Existing DNA polymerases used in sequencing reactions face challenges in processivity, fidelity, and substrate binding, which affect the accuracy and efficiency of nucleic acid sequencing.
Innovation Solution
Modified recombinant polymerases with amino acid mutations, domain substitutions, and exonuclease modifications are developed to enhance processivity, fidelity, and substrate binding, enabling improved signal readout in single molecule sequencing reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing DNA polymerases are used in sequencing reactions, then the sequencing process can be performed, but the processivity, fidelity, and substrate binding are insufficient, leading to reduced accuracy and efficiency
Solution Approach 1:
The patent applies parameter changes by modifying specific amino acid residues in the polymerase enzyme structure (e.g., changing Thr253 to Alanine, Ser254 to Alanine, or Thr253 to Valine) to optimize processivity, fidelity, and substrate binding properties, thereby improving sequencing accuracy without fundamentally changing the enzyme's core function
Solution Approach 2:
The patent creates composite enzyme structures by combining modified polymerase variants with sequencing reaction components, where the engineered polymerase with specific amino acid mutations works synergistically with nucleotides and templates to achieve enhanced sequencing performance
2Measurement precision
If existing polymerases are used, then sequencing reactions can proceed, but pulse widths and interpulse distances are insufficient, making it difficult to discriminate between true incorporation events and artefacts
Solution Approach 1:
The patent modifies kinetic parameters of the polymerase enzyme through amino acid substitutions (such as S254A, T253A, T253V mutations) to extend pulse widths and increase interpulse distances, enabling better temporal resolution between nucleotide incorporation events and improving signal discrimination accuracy
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 polymerases provide enhanced pulse widths and interpulse distances, allowing for accurate discrimination between true incorporation events and artefacts, thereby improving the accuracy of nucleic acid sequencing.
Implementation Method 1
Modified recombinant polymerases with amino acid mutations, domain substitutions, and exonuclease modifications are developed to enhance processivity, fidelity, and substrate binding
Data Source
AI summary
Compositions comprising modified recombinant polymerizing enzymes are provided, along with nucleic acid molecules encoding the modified polymerizing enzymes. In some aspects, methods of using such polymerizing enzymes to synthesize a nucleic acid molecule or to sequence a nucleic acid template are provided.