Method for analysing amino acids, peptides and proteins
First Claim
1. A method of analysis of amino acids, peptides or proteins, the method comprising:
- (1) derivatizing a mixture of amino acids, peptides or proteins, to form at least one amino acid, peptide or protein derivatized to contain a fixed-charge ion, other than at the C-terminal or N-terminal end thereof;
(2) introducing the mixture of amino acids, peptides or proteins containing at least one amino acid, peptide or protein derivatized to contain a fixed-charge ion other than at the C-terminal or N-terminal end thereof, to a mass spectrometer;
(3) passing the mixture of amino acids, peptides or proteins containing at least one amino acid, peptide or protein derivatized to contain a fixed-charge ion, other than at the C-terminal or N-terminal end thereof, through a first mass resolving spectrometer to select precursor protein or peptide ions having a first mass-to-charge ratio;
(4) subjecting the precursor ions of the first mass-to-charge ratio to dissociation to form product ions having a second mass-to-charge ratio that is characteristic of a fragmentation occurring at a site adjacent to the fixed charge; and
(5) detecting the product ions having the second mass-to-charge ratio.
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Accused Products
Abstract
The invention provides methods, reagents and kits for amino acid, peptide and protein identification, differential quantitation and for the analysis of post translational modification and cross-linking status, comprising: derivatizing a mixture of amino acids peptides or proteins, to form at least one amino acid peptide or protein containing a fixed-charge ion, other than at the C-terminal or N-terminal end thereof; introducing the mixture of amino acids peptides or proteins containing the fixed charge derivatized amino acid peptide or protein to a mass spectrometer; passing the mixture of amino acids peptides or proteins containing the fixed charge derivatized amino acid peptide or protein through a first mass resolving spectrometer to select precursor protein or peptide ions having a first desired mass-to-charge ratio; subjecting the precursor ions of the first mass to charge ratio to dissociation to form a product ion having a second mass-to-charge ratio that is characteristic of a fragmentation occurring at a site adjacent to the fixed charge; and detecting the product ions having the second mass-to-charge ratio. The product ion having the second mass-to-charge ratio may be either a product ion formed by neutral loss of the fixed charge from the precursor ion, or a product ion formed by charged loss of the fixed charge from the precursor ion.
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Citations
90 Claims
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1. A method of analysis of amino acids, peptides or proteins, the method comprising:
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(1) derivatizing a mixture of amino acids, peptides or proteins, to form at least one amino acid, peptide or protein derivatized to contain a fixed-charge ion, other than at the C-terminal or N-terminal end thereof;
(2) introducing the mixture of amino acids, peptides or proteins containing at least one amino acid, peptide or protein derivatized to contain a fixed-charge ion other than at the C-terminal or N-terminal end thereof, to a mass spectrometer;
(3) passing the mixture of amino acids, peptides or proteins containing at least one amino acid, peptide or protein derivatized to contain a fixed-charge ion, other than at the C-terminal or N-terminal end thereof, through a first mass resolving spectrometer to select precursor protein or peptide ions having a first mass-to-charge ratio;
(4) subjecting the precursor ions of the first mass-to-charge ratio to dissociation to form product ions having a second mass-to-charge ratio that is characteristic of a fragmentation occurring at a site adjacent to the fixed charge; and
(5) detecting the product ions having the second mass-to-charge ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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- 56. A substituted acetophenone, or a salt thereof, or a solvate thereof, having the following formula:
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57. (canceled)
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59-60. -60. (canceled)
- 61. A water soluble substituted acetophenone, or a salt thereof, or a solvate thereof, having the following formula:
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62. (canceled)
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64. (canceled)
- 69. A reagent kit for analysis of amino acids, peptides or proteins by mass spectrometry comprising a container containing a substituted acetophenone, or a salt thereof, or a solvate thereof, having the following formula:
- 80. An amino acid or peptide comprising an amino acid derivatized to include a side chain fixed-charge sulfonium ion, quaternary alkylammonium ion or quaternary alkylphosphonium ion.
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81. (canceled)
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86-87. -87. (canceled)
Specification