Compositions, devices, systems, and methods for using a nanopore
Devices and methods that can detect and control an individual polymer in a mixture is acted upon by another compound, for example, an enzyme, in a nanopore are provided. The devices and methods also determine (˜>50 Hz) the nucleotide base sequence of a polynucleotide under feedback control or using signals generated by the interactions between the polynucleotide and the nanopore. The invention is of particular use in the fields of molecular biology, structural biology, cell biology, molecular switches, molecular circuits, and molecular computational devices, and the manufacture thereof.
1. A method for nucleic acid sequencing, comprising:
(a) providing a chip comprising a plurality of individually addressable elements, each individually addressable element of said plurality of individually addressable elements containing a single nanopore formed in a membrane disposed adjacent to an electrode, wherein each individually addressable element is adapted to detect a nucleic acid molecule or a portion thereof;
(b) providing a plurality of processive enzyme-nucleic acid molecule complexes to nanopores of said individually addressable elements;
(c) applying a voltage across the membranes of said individually addressable elements;
(d) determining, with the aid of a processor coupled to said chip, a nucleic acid sequence of nucleic acid molecules of said processive enzyme-nucleic acid molecule complexes based on current signals received from individually addressable elements of said plurality of individually addressable elements;
(e) detecting a current reduction from an individually addressable element, the current reduction having a magnitude and duration; and
(f) based on the magnitude and duration of the current reduction, reversing the voltage across the membrane of the individually addressable element to eject the processive enzyme-nucleic acid molecule complex from the nanopore of the individually addressable element.
2. The method of claim 1 , wherein said nucleic acid molecules are derived from a nucleic acid sample.
3. The method of claim 2 , wherein each of said nucleic acid molecules has a shorter nucleic acid sequence than said nucleic acid sample.
4. The method of claim 3 , further comprising, prior to (b), fragmenting said nucleic acid sample to provide said nucleic acid molecules.
5. The method of claim 2 , further comprising characterizing a nucleic acid sequence of said nucleic acid sample based upon the determining of a nucleic acid sequence of each of said nucleic molecules.
6. The method of claim 1 , wherein said electrode is adapted to supply an electrical stimulus across said membrane, which stimulus enables the generation of a detectable signal upon molecular flow of said nucleic acid molecule or portion thereof.
7. The method of claim 1 , wherein said membrane has a capacitance greater than about 3 fF/μm 2 and less than about 15 fF/μm 2 as measured across said membrane.
8. The method of claim 1 , wherein said membrane has a resistance greater than or equal to about 500 MΩ and less than or equal to about 1 GΩ as measured across said membrane.
9. The method of claim 1 , wherein said membrane has a resistance greater than or equal to about 10 GΩ across said membrane prior to formation of a nanopore in said membrane.
10. The method of claim 1 , wherein each individually addressable element is adapted to regulate molecular flow.
11. The method of claim 10 , wherein each individually addressable element is adapted to regulate molecular flow with the aid of an electrical stimulus applied to said nanopore.
12. The method of claim 11 , wherein said electrical stimulus comprises one or more voltage pulses.
13. The method of claim 1 , wherein each individually addressable element is adapted to regulate molecular flow adjacent to said nanopore.
14. The method of claim 1 , wherein each individually addressable element is adapted to regulate molecular flow through said nanopore.
15. The method of claim 1 , wherein each individually addressable element is adapted to detect said nucleic acid molecule or a portion thereof upon molecular flow of said nucleic acid molecule or portion thereof through or adjacent to said nanopore.
16. The method of claim 1 , wherein said nucleic acid sequence is characterized upon movement of each of said nucleic acid molecules or portions thereof.
17. The method of claim 1 , wherein said electrode is coupled to an integrated circuit that processes a signal detected with the aid of said electrode.
18. The method of claim 1 , wherein providing a plurality of processive enzyme-nucleic acid molecule complexes to nanopores of said individually addressable elements comprises directing a plurality of enzyme-nucleic acid molecule complexes to nanopores of said individually addressable elements.
19. A system for nucleic acid sequencing, comprising:
(a) a chip comprising a plurality of individually addressable elements, each individually addressable element of said plurality of individually addressable elements containing a single nanopore formed in a membrane disposed adjacent to an electrode, wherein each individually addressable element is adapted to aid in the detection of a nucleic acid molecule of a processive enzyme-nucleic acid molecule complex or a portion thereof; and
(b) a processor coupled to said chip, wherein said processor is programmed to:
aid in determining a nucleic acid sequence of nucleic acid molecules of processive enzyme-nucleic acid molecule complexes based on current signals received from said plurality of individually addressable elements during application of a voltage across the membranes of said plurality of individually addressable elements; and
reverse the voltage across the membrane of an individually addressable element to eject a processive enzyme-nucleic acid molecule complex from the nanopore of the individually addressable element when a current reduction of a magnitude and duration is detected from the individually addressable element.
20. The system of claim 19 , wherein said electrode is adapted to supply an electrical stimulus across said membrane, which stimulus enables the generation of a detectable signal upon molecular flow of said nucleic acid molecule or portion thereof.
21. The system of claim 19 , wherein said membrane has a capacitance greater than about 3 fF/μm 2 and less than about 15 fF/μm 2 as measured across said membrane.
22. The system of claim 19 , wherein said membrane has a resistance greater than or equal to about 500 MΩ and less than or equal to about 1 GΩ as measured across said membrane.
23. The system of claim 19 , wherein said membrane has a resistance greater than or equal to about 10 GΩ across said membrane prior to formation of a nanopore in said membrane.
24. The system of claim 19 , wherein each individually addressable element is adapted to regulate molecular flow.
25. The system of claim 24 , wherein each individually addressable element is adapted to regulate molecular flow with the aid of an electrical stimulus applied to said nanopore.
26. The system of claim 25 , wherein said electrical stimulus comprises one or more voltage pulses.
27. The system of claim 19 , wherein each individually addressable element is adapted to regulate molecular flow adjacent to said nanopore.
28. The system of claim 19 , wherein each individually addressable element is adapted to regulate molecular flow through said nanopore.
29. The system of claim 19 , wherein each individually addressable element is adapted to detect said nucleic acid molecule or a portion thereof upon molecular flow of said nucleic acid molecule or portion thereof through or adjacent to said nanopore.
30. The system of claim 19 , wherein said electrode is coupled to an integrated circuit that processes a signal detected with the aid of said electrode.