Granted Patent
B2
US 12,379,381 · App. 17/811,284 · Granted Aug 5, 2025
Single molecule peptide sequencing
Inventors:
Edward Marcotte (Austin, TX); Eric V. Anslyn (Austin, TX); Andrew Ellington (Austin, TX); Jagannath Swaminathan (Austin, TX)
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Abstract
Methods of identifying a sequence of a polypeptide within a heterogenous mixture of polypeptides, the polypeptide being immobilized to a support and having at least one labeled amino acid residue. Methods involve detecting at least one signal or signal change from the immobilized polypeptide and subjecting the polypeptide to conditions sufficient to remove at least one amino acid residue from the polypeptide.
Claims (34)
1. A method for analyzing a polypeptide, comprising:
(a) providing said polypeptide immobilized to a support, wherein said polypeptide comprises a plurality of amino acid residues, each amino acid residue comprising a covalently coupled label;
(b) detecting at least one signal or signal change from said polypeptide immobilized to said support to identify at least a portion of a sequence of said polypeptide; and
(c) subjecting said polypeptide to conditions sufficient to remove at least one amino acid residue from said polypeptide,
wherein said at least one signal or signal change comprise a collective signal from said plurality of labeled amino acid residues.
2. The method of claim 1 , wherein said covalently coupled label comprises a non-epitope specific molecule.
3. The method of claim 2 , wherein said non-epitope specific molecule comprises a fluorophore.
4. The method of claim 3 , wherein said fluorophore comprises a dye.
5. The method of claim 4 , wherein said dye is selected from the group consisting of tetramethylrhodamine, Si-Rhodamine, Rhodamine B, Rhodamine B N, N′-dimethylethylenediamine, Rhodamine B sulfenyl chloride, 4-(6-amino-3-imino-4,5-disulfo-3H-xanthen-9-yl)isophthalic acid, 8-[2-[4-(2,5-dioxopyrrolidin-1-yl)oxycarbonylpiperidin-1-yl]-2-oxoethoxylpyrene-1,3,6-trisulfonate; triethylazanium, 2-(7-ethyl-3,3,8,8,10-pentamethyl-7-aza-21-azoniahexacyclo[15.7.1.02,15.04,13.06,11.021,25]pentacosa-1,4(13),5,11,14,16,18,21(25)-octaen-14-yl)-N-methyl-N-(4-oxopentyl)benzamide, (5)6-napthofluorescein, iodoacetamide, 2-methoxy-4,5-dihydro-1H-imidazole, 2-methylthio-2-imadazoline hydroiodide, 2,4-Dinitrobenezenesulfenyl chloride, 2-{(1E,3Z)-3-[1-(5-carboxypentyl)-3,3-dimethyl-5-sulfo-1,3-dihydro-2H-indol-2-ylidene]-1-propen-1-yl}-1-ethyl-3,3-dimethyl-3H-indolium-5-sulfonate, 6-[(2E)-3,3-dimethyl-2-[(2E,4E)-5-(1,3,3-trimethylindol-1-ium-2-yl)penta-2,4-dienylidene]indol-1-yl]hexanoic acid; chloride, and variants thereof.
6. The method of claim 3 , wherein said fluorophore comprises a quantum dot.
7. The method of claim 3 , wherein said fluorophore comprises a small molecule.
8. A method for analyzing a polypeptide of a heterogenous mixture of polypeptides, comprising:
(a) providing said polypeptide, wherein said polypeptide is immobilized to a support, and comprises a plurality of labeled amino acid residues;
(b) detecting at least one signal or signal change from said polypeptide to identify at least a portion of a sequence of said polypeptide; and
(c) subsequent to (b), subjecting said polypeptide to conditions sufficient to remove at least one amino acid residue from said polypeptide,
wherein said at least one signal or signal change comprises a collective signal from said plurality of labeled amino acid residues.
9. The method of claim 8 , further comprising simultaneously analyzing said heterogenous mixture of polypeptides.
10. The method of claim 8 , wherein (b) further comprises detecting said at least one signal or signal change with an optical detector having single-molecule sensitivity.
11. The method of claim 8 , wherein said support comprises an array.
12. The method of claim 8 , further comprising (i) repeating (b) and (c) to detect at least one additional signal or signal change from said polypeptide immobilized to said support, and (ii) using (1) said signal or signal change or (2) said additional signal or signal change to identify said at least said portion of said sequence of said polypeptide.
13. The method of claim 8 , further comprising processing said at least said portion of said sequence of said polypeptide against a reference sequence to identify a polypeptide or a protein from which said polypeptide is derived.
14. The method of claim 8 , further comprising, subsequent to (c), (i) identifying said at least said portion of said sequence of said polypeptide to identify said polypeptide, and (ii) using said polypeptide identified in (i) to quantify said polypeptide or a protein from which said polypeptide was derived.
15. A method for identifying a sequence of a polypeptide, comprising:
(a) providing said polypeptide immobilized to a support, wherein a plurality which is fewer than all amino acid residues of said polypeptide are labeled;
(b) detecting at least one signal or signal change from said plurality of labeled amino acid residues of said polypeptide; and
(c) using said at least one signal or signal change detected in (b) to identify said sequence of said polypeptide,
wherein said at least one signal or signal change comprises a collective signal from said plurality of labeled amino acid residues.
16. The method of claim 15 , further comprising, subsequent to (a), subjecting said polypeptide to a degradation reaction to remove at least one amino acid residue from said polypeptide.
17. The method of claim 16 , wherein (b) is performed during or subsequent to said subjecting said polypeptide to said degradation reaction.
18. A method comprising:
(a) providing a heterogeneous population of polypeptides, each polypeptide within the heterogeneous population comprising a plurality of labeled amino acid residues;
(b) subjecting said heterogeneous population of polypeptides to sequencing to identify sequences of polypeptides of said heterogeneous population of polypeptides, wherein at least a subset of said sequences are identical; and
(c) generating a measure of said at least said subset of said sequences that are identical,
wherein said measure is generated from a collective signal from said plurality of labeled amino acid residues in each polypeptide within the heterogeneous population.
Continuity (10)
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