Materials and methods relating to single molecule arrays
Embodiments of the present disclosure relate generally to single molecule arrays. More particularly, the present disclosure provides materials and methods for generating single molecule arrays using bottom-up self-assembly processes. Materials and methods of the present disclosure can be used to generate single molecule arrays with nanoapertures (e.g., zero mode waveguides) and for carrying out rapid, point-of-care biomolecule detection and quantification.
1. A single molecule array comprising:
an activated silanol-enriched glass substrate;
an organosilane base layer deposited onto the glass substrate, wherein the organosilane base layer comprises a plurality of regularly spaced binding sites; and
an artificial nucleic acid nanostructure layer comprising a plurality of individual nucleic acid molecules, wherein the plurality of individual nucleic acid molecules comprise individual DNA origami nanostructures bound to silanol groups on the glass substrate via Mg 2+ salt bridges within the plurality of regularly spaced binding sites, wherein the individual DNA origami nanostructures are further conjugated to a plurality of removable polystyrene beads, which upon removal, form a plurality of individual nanoapertures containing individual DNA origami nanostructures.
2. The array of claim 1 , wherein the glass substrate is treated with a plasma cleaner.
3. The array of claim 1 , wherein the glass substrate is a transparent glass chip about 1 cm 2 .
4. The array of claim 1 , wherein the organosilane base layer is deposited onto the glass substrate using surface passivation, and wherein the organosilane base layer comprises at least one of hexamethyldisilazane (HMDS), PEG-silane, CTES+HMDS, trimethylsilyl (TMS), amino-terminated silane (Aminopropylsilatrane-APS) in binding sites, covalent immobilization via amide or isourea bond on binding sites.
5. The array of claim 1 , wherein the binding sites have diameters formed by a plurality of regularly spaced removable nanospheres deposited on and in contact with the glass substrate prior to application of the organosilane base layer.
6. The array of claim 1 , wherein the plurality of regularly spaced binding sites are about 80 nm to about 200 nm in diameter.
7. The array of claim 1 , wherein the binding sites number from about 100 million per cm 2 to about 200 million per cm 2 .
8. The array of claim 1 , wherein the individual DNA origami nanostructures are generally circular, generally square, or generally rectangular in shape, and range from about 50 nm to about 200 nm in width and about 50 nm to about 200 nm in length.
9. The array of claim 1 , further comprising a metallic layer deposited onto the organosilane base layer, wherein the metallic layer comprises a plurality of zeromode waveguide (ZMVV) nanoapertures.
10. The array of claim 9 , wherein the ZMW nanoapertures in the metallic layer have diameters formed by a plurality of regularly spaced removable nanospheres deposited on and in contact with the plurality of individual nucleic acid molecules prior to application of the metallic layer.
11. A single molecule array comprising:
an activated silanol-enriched glass substrate;
a metallic base layer deposited onto the glass substrate, wherein the metallic base layer comprises a plurality of regularly spaced ZMW nanoapertures and at least one of aluminum, silver, gold, and chromium, or combinations thereof; and
an artificial nucleic acid nanostructure layer comprising a plurality of individual nucleic acid molecules comprised of individual DNA origami nanostructures contained within each ZMW nanoaperture and bound to silanol groups on the glass substrate via Mg 2+ salt bridges;
wherein the ZMW nanoapertures have diameters formed by a plurality of regularly spaced removable nanospheres deposited on and in contact with the individual DNA origami nanostructures prior to application of the metallic base layer.
12. A bottom-up method for manufacturing a single molecule array, the method comprising:
depositing an artificial nucleic acid nanostructure layer comprising a plurality of individual nucleic acid molecules onto an activated silanol-enriched glass substrate, wherein the plurality of individual nucleic acid molecules comprise individual DNA origami nanostructures selectively bound to silanol groups on the glass substrate via Mg 2+ salt bridges;
depositing a plurality of removable nanospheres onto the activated silanol-enriched glass substrate and the individual DNA origami nanostructures, wherein the plurality of removable nanospheres are conjugated to the individual DNA origami nanostructures;
depositing an organosilane base layer onto the glass substrate and the plurality of nanospheres; and
removing the plurality of nanospheres to form a plurality of binding sites in the organosilane base layer in regions where the plurality of nanospheres contacted the individual DNA origami nanostructures;
wherein the plurality of binding sites comprise individual nanoapertures containing individual DNA origami nanostructures.
13. The method of claim 12 , wherein the glass substrate is treated with a plasma cleaner prior to deposition.
14. The method of claim 12 , wherein depositing the plurality of removable nanospheres comprises at least one of: (i) spin-coating; (ii) Langmuir-Blodgett based deposition; or (iii) tilted drop-casting via solvent evaporation.
15. The method of claim 12 , wherein depositing the organosilane base layer onto the glass substrate and the plurality of nanospheres comprises at least one of: (i) vapor deposition of hexamethyldisilazane (HMDS); or (ii) liquid phase deposition of PEG-silane.
16. The method of claim 12 , wherein removing the plurality of nanospheres comprises sonication.