DNA Origami Site-Specific Immobilization via ssDNA Capture Strands
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Solution Overview
Problem
Current methods for immobilizing DNA origami structures on solid substrates lack site-specificity and are inefficient, relying on costly and time-consuming processes, with insufficient lateral resolution and inability to pattern multiple different proteins or peptides effectively.
Innovation Solution
A method involving pre-patterned optically transparent solid substrates functionalized with ssDNA capture strands that bind to ssDNA strands protruding from DNA origami structures via Watson-Crick pairing, allowing for controlled, site-specific immobilization of DNA origami structures on selected areas, using a buffer with sodium dodecylsulphate to maintain structural integrity and enable precise binding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional top-down patterning techniques (photolithography, electron-beam lithography) are used to immobilize DNA origami structures, then large-area spatially ordered arrays can be produced, but the lateral resolution is insufficient and multiple different proteins cannot be patterned effectively
Solution Approach 1:
The substrate is divided into multiple distinct regions, each functionalized with different ssNA capture strands specific to different DNA origami types. This segmentation enables simultaneous patterning of multiple different proteins and peptides with high lateral resolution while maintaining large-area coverage
Solution Approach 2:
ssNA capture strands are introduced as intermediary molecules that mediate the specific binding between DNA origami structures and the substrate. These capture strands provide sequence-specific recognition, enabling precise spatial control and multi-type patterning with high lateral resolution
2Ease of manufacture
If electrostatic interactions are used for origami immobilization on nanopatterned surfaces, then deposition is feasible, but site-selectivity cannot be realized
Solution Approach 1:
Different regions of the substrate are functionalized with different types of ssNA capture strands, creating local quality variations that enable site-selective binding. Each region has specific binding properties tailored to attract particular DNA origami structures, achieving both ease of manufacture and high site-selectivity
3Manufacturing precision
If direct writing of multiple different cell specific peptide and protein ligands by dip-pen nanolithography is attempted, then protein feature sizes >50 nm can be achieved, but the technique is generally not feasible due to individual buffer composition requirements for different polypeptides
Solution Approach 1:
The substrate functionalization approach is made universal by using ssNA capture strands that can be incorporated into a single common buffer system. This multi-functional platform enables patterning of multiple different proteins and peptides simultaneously without requiring individual buffer optimization for each polypeptide, maintaining high feature size precision while reducing overall system complexity
4Area of stationary object
If nanoparticle-decorated origami structures are deposited on nanopatterned surfaces prepared by electron-beam lithography and etching processes, then large-area spatially ordered arrays can be generated, but the production is very cost and time consuming
Solution Approach 1:
The substrate is pre-functionalized with ssNA capture strands in advance, creating a ready-to-use platform that enables direct, rapid immobilization of DNA origami structures. This preliminary preparation eliminates time-consuming deposition processes while maintaining large-area array generation capability
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
Enables full control over the spatial location of DNA origami structures on substrates, achieving site-specific immobilization while maintaining the integrity of DNA origami structures and substrates, allowing for precise arrangement of objects-of-interest like proteins and peptides with high binding efficiency.
Implementation Method 1
the ssNA capture strands are capable of binding to the ssNA strands protruding from the DNA origami structure by Watson-Crick pairing
Implementation Method 2
step (c) is carried out in the presence of a buffer comprising sodium dodecylsulphate (SDS) and under conditions that (i) do not compromise the structure and integrity of the DNA origami structures, the ssNA strands, and the solid substrate
Data Source
Figure 1a~1
Figure 2
Figure 3A
AI summary
The present invention relates to methods for the site-specific immobilization of DNA origami structures on solid substrates, as well as to respective assemblies comprising DNA origami structures immobilized on a solid substrate and uses thereof.