Difference gel electrophoresis using matched multiple dyes
First Claim
1. A method of comparing protein composition of interest between at least two different cell samples comprising:
- (a) preparing an extract of proteins from each of said at least two cell samples;
(b) providing a set of matched luminescent dyes chosen from dyes capable of covalently binding to proteins within said extract of proteins, wherein each dye within said set(1) has a net charge which will maintain the overall net charge of the proteins upon such covalent binding and has ionic and pH characteristics whereby relative electrophoretic migration of a protein labeled with any one of said dyes is the same as relative electrophoretic migration of said protein labeled with another dye in said set,(2) emits luminescent light at a wavelength that is sufficiently different from the emitted luminescent light of remaining dyes in said set to provide a detectably different light signal;
(c) reacting each extract of proteins of step (a) with a different dye from said set of step (b) to provide dye-labeled proteins;
(d) quenching the labeling reactions of step (c) between the dyes and the protein;
(e) mixing each of said dye labeled proteins to form a single mixture of different dye-labeled protein;
(f) electrophoresing the mixture of step (e) by a predetermined electrophoresing method capable of separation within said mixture; and
(g) detecting the difference in luminescent intensity between the different dye-labeled protein by luminescent detection.
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Accused Products
Abstract
A process and a kit are provided for detecting differences in two or more samples of protein. Protein extracts are prepared, for example, from each of a different group of cell samples to be compared. Each protein extract is labeled with a different one of a luminescent dye from a matched set of dyes. The matched dyes have generally the same ionic and pH characteristics but emit light at different wavelengths to exhibit a different color upon luminescence detection. The labeled protein extracts are mixed together and electrophoresed together. The gel is observed to detect proteins unique to one sample or present in a greater ratio in one sample than in the other. Those unique or excess proteins will fluoresce the color of one of the dyes used. Proteins common to each sample migrate together and fluoresce the same.
134 Citations
18 Claims
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1. A method of comparing protein composition of interest between at least two different cell samples comprising:
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(a) preparing an extract of proteins from each of said at least two cell samples; (b) providing a set of matched luminescent dyes chosen from dyes capable of covalently binding to proteins within said extract of proteins, wherein each dye within said set (1) has a net charge which will maintain the overall net charge of the proteins upon such covalent binding and has ionic and pH characteristics whereby relative electrophoretic migration of a protein labeled with any one of said dyes is the same as relative electrophoretic migration of said protein labeled with another dye in said set, (2) emits luminescent light at a wavelength that is sufficiently different from the emitted luminescent light of remaining dyes in said set to provide a detectably different light signal; (c) reacting each extract of proteins of step (a) with a different dye from said set of step (b) to provide dye-labeled proteins; (d) quenching the labeling reactions of step (c) between the dyes and the protein; (e) mixing each of said dye labeled proteins to form a single mixture of different dye-labeled protein; (f) electrophoresing the mixture of step (e) by a predetermined electrophoresing method capable of separation within said mixture; and (g) detecting the difference in luminescent intensity between the different dye-labeled protein by luminescent detection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of comparing proteins of interest between at least two different samples comprising:
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(a) preparing a mixture of proteins from each of said at least two samples; (b) providing a set of matched luminescent dyes chosen from dyes capable of covalently binding to said proteins within said mixture of proteins, wherein each dye within said set (1) has ionic and pH characteristics whereby relative electrophoretic migration of a protein labeled with any one of said dyes is the same as relative electrophoretic migration of said protein labeled with another dye in said set, (2) emits luminescent light at a wavelength that is sufficiently different from the emitted luminescent light of remaining dyes in said set to provide a detectably different light signal; (c) reacting each said mixtures of proteins of step (a) with a different dye from said set of step (b) to provide dye-labeled protein; (d) quenching the labeling reactions of step (c) between the dyes and the proteins; (e) mixing each of said dye labeled proteins to form a combined single mixture of different dye-labeled proteins; (f) electrophoresing the combined mixture of step (e) by a predetermined electrophoresing method capable of separating the dye-labeled proteins of interest within said mixture; and (g) detecting the difference in luminescent intensity between the different dye-labeled proteins of interest by luminescent detection. - View Dependent Claims (15, 16, 17)
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18. A method of comparing proteins of interest between at least two different samples comprising:
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(a) preparing a mixture of proteins from each of said at least two samples; (b) providing a set of matched luminescent dyes chosen from a single class of dyes capable of covalently binding to proteins within said mixture of proteins, wherein each dye within said set (1) has ionic and pH characteristics whereby relative electrophoretic migration of a protein labeled with any one of said dyes is the same as relative electrophoretic migration of said protein labeled with another dye in said set, (2) emits luminescent light at a wavelength that is sufficiently different from the emitted luminescent light of remaining dyes in said set to provide a detectably different light signal; (c) reacting each mixture of proteins of step (a) with a different dye from said set of step (b) to provide dye-labeled proteins; (d) quenching the labeling reactions of step (c) between the dyes and the proteins; (e) mixing each of said dye labeled proteins to form a combined single mixture of different dye-labeled proteins; (f) electrophoresing the combined mixture of step (e) by a predetermined electrophoresing method capable of separating the dye-labeled proteins of interest within said combined mixture; and (g) detecting the difference in luminescent intensity between the different dye-labeled proteins of interest by luminescent detection.
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Specification