Altered DNA Polymerases for Large 3' Substituent Incorporation
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Solution Overview
Problem
Existing DNA polymerases struggle to efficiently incorporate nucleotides with 3' sugar hydroxyl modifications that have larger substituents than the natural 3' hydroxyl group, which are essential for controlled DNA sequencing and synthesis, as previous modifications focused on smaller substituents or lacked base specificity.
Innovation Solution
Development of altered DNA polymerases with specific amino acid changes in the nucleotide binding site, particularly in the motif A region, allowing for improved incorporation of nucleotides with large 3' substituents, maintaining base specificity, and operating effectively at various temperatures and substrate concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DNA polymerases are modified to incorporate nucleotides with large 3' substituents, then incorporation efficiency is improved, but base specificity may be compromised
Solution Approach 1:
The patent applies local quality by making specific amino acid changes only in the nucleotide binding site region (motif A region) of the polymerase enzyme, while maintaining the rest of the enzyme structure unchanged. This localized modification allows the polymerase to accommodate large 3' substituents without compromising overall base specificity, as the changes are confined to the specific region responsible for nucleotide recognition and binding.
Solution Approach 2:
The patent employs parameter changes by modifying the amino acid sequence parameters of the polymerase at specific positions (motif A region) to alter its substrate specificity. These parameter changes enable the enzyme to recognize and incorporate nucleotides with large 3' substituents while maintaining fidelity, demonstrating how enzymatic parameters can be tuned to achieve new functional capabilities without sacrificing existing ones.
2Productivity
If polymerases are engineered for high incorporation rates, then productivity increases, but operation complexity increases
Solution Approach 1:
The patent uses parameter changes to optimize the polymerase enzyme through specific amino acid modifications that enhance incorporation rates. By carefully selecting and limiting the number of parameter changes to only the motif A region, the patent achieves high productivity without introducing excessive complexity into the enzyme system or its operation.
3Adaptability or versatility
If polymerases are modified to work at various temperatures, then adaptability improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies universality by creating a polymerase variant through motif A region modifications that can function effectively across a wide temperature range (including human body temperature and higher temperatures). This single set of modifications provides multi-functionality, allowing the same enzyme to operate in diverse thermal conditions without requiring separate engineered variants for each temperature range.
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 altered polymerases exhibit enhanced incorporation rates and specificity for nucleotides with large 3' substituents, enabling efficient DNA sequencing and synthesis, with improved activity over multiple cycles and at lower substrate concentrations, and across a wide temperature range.
Implementation Method 1
modified DNA polymerases which give improved incorporation of modified nucleotides
Implementation Method 2
incorporation of nucleotides into a polynucleotide chain
Data Source
AI summary
The invention relates to modified polymerase enzymes which exhibit improved incorporation of nucleotide analogues bearing substituents at the 3′ position of the sugar moiety that are larger in size than the naturally occurring 3′ hydroxyl group. Also described are methods of using the polymerases to incorporate nucleotides into polynucleotides, particularly in the context of DNA sequencing.