Substrate-Bound Polymerase for Spatially Controlled Polynucleotide Synthesis
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Solution Overview
Problem
Current polynucleotide synthesis techniques, such as nucleoside phosphoramidite and enzymatic methods, are inefficient for synthesizing large numbers of polynucleotides with specific sequences required for DNA data storage, and existing enzymatic methods lack spatial control and reusability of polymerases.
Innovation Solution
The use of substrate-bound polymerases, tethered to a solid substrate, allows for spatially controlled synthesis of polynucleotides by regulating polymerase activity through blocking group removal or cofactor oxidation state, enabling precise synthesis of polynucleotides with arbitrary sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If enzymatic polynucleotide synthesis uses template-independent polymerases to add nucleotides onto growing strands, then polynucleotide synthesis can be achieved, but spatial control and reusability of polymerases are lacking
Solution Approach 1:
The system divides the substrate into multiple addressable locations where polymerases are tethered at specific positions. Each location can be independently controlled for nucleotide addition, enabling spatial addressing and precise control over where synthesis occurs on the substrate surface.
Solution Approach 2:
Polymerases are pre-tethered to the substrate at defined locations before synthesis begins. Blocking groups are pre-installed on the substrate to control initial polymerase activity. This preliminary setup enables subsequent spatial control without requiring complex real-time manipulation during synthesis.
2Productivity
If polymerases are used for synthesizing large numbers of polynucleotides with specific sequences, then DNA data storage capability is enabled, but reagent costs increase due to lack of polymerase reusability
Solution Approach 1:
Instead of discarding polymerases after single-use synthesis, the system recovers them by tethering to the substrate. Polymerases remain bound and reusable across multiple synthesis cycles, continuously adding nucleotides to growing strands without being consumed or requiring replacement.
Solution Approach 2:
The tethered polymerases serve themselves by remaining on the substrate and automatically being available for subsequent synthesis rounds. The system eliminates the need for repeated polymerase addition, as the anchored enzymes continuously perform their catalytic function across multiple cycles.
3Manufacturing precision
If blocking groups are removed to activate polymerase activity at selected locations, then spatial addressability is achieved, but additional processing steps are required
Solution Approach 1:
The system replaces mechanical or chemical manipulation methods with optoelectronic control. Light-sensitive blocking groups are removed using targeted light exposure through a digital micromirror device, substituting complex chemical deprotection procedures with precise optical addressing.
Solution Approach 2:
The system uses light intensity and wavelength as controllable parameters to selectively remove blocking groups at different locations. By varying optical parameters spatially and temporally, precise control over where and when polymerase activation occurs is achieved without mechanical intervention.
4Productivity
If multiple techniques are used for highly parallel and automated polynucleotide synthesis, then synthesis efficiency improves, but system complexity increases
Solution Approach 1:
The system uses a universal substrate design that can accommodate multiple polymerases and nucleotide types at different locations. The same basic apparatus performs multiple functions: tethering polymerases, delivering nucleotides, removing blocking groups optically, and synthesizing diverse polynucleotide sequences in parallel.
Solution Approach 2:
The synthesis process uses periodic cycles of nucleotide addition followed by blocking group removal. This rhythmic alternation between synthesis and activation phases enables highly parallel operation across multiple substrate locations while maintaining simple, repetitive operational steps.
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
This method enhances the precision and reusability of polymerases, reducing reagent costs and enabling the synthesis of polynucleotides with specified sequences, suitable for applications like digital data storage.
Implementation Method 1
A polymerase is an enzyme that catalyzes the addition of nucleotide monomers onto a growing polynucleotide strand
Implementation Method 2
The polymerase may be attached directly to the surface of a solid substrate or attached via a linker molecule
Data Source
AI summary
De novo polynucleotide synthesis is performed with a substrate-bound polymerase. The polymerase is attached to a solid substrate such as a microelectrode array. The polymerase adds nucleotides to growing polynucleotides strands that are also attached to the solid substrate. Spatial control of polymerase activity is achieved by changing the rate of nucleotide polymerization at selected locations on the surface of the solid substrate. The rate of polymerization is changed by inhibiting or promoting activity of the polymerase. In some implementations, activation of electrodes in the microelectrode array changes the rate of nucleotide polymerization. Nucleotides are added to the growing polynucleotide strands at areas where the polymerase is active. By varying the locations where the substrate-bound polymerase is active and the species of nucleotide added, a population of polynucleotides with different, arbitrary sequences is synthesized on the surface of the solid substrate.