Abstract:
A method of comparative ligand mapping to identify peptide ligands presented by MHC positive cells that distinguish an infected/transfected cell from an uninfected/non-transfected cell is disclosed.
Abstract:
The present invention provides a method for quantifying a peptide compound having a phenylalanine residue at the N-terminal, comprising measuring the content of heat generated by mixing 1) a peptide compound having a phenylalanine residue at the N-terminal, 2) cucurbit[7]uril, and 3) a metal ion in a solution.
Abstract:
The present invention provides a method for quantifying a peptide compound having a phenylalanine residue at the N-terminal, comprising measuring the content of heat generated by mixing 1) a peptide compound having a phenylalanine residue at the N-terminal, 2) cucurbit[7]uril, and 3) a metal ion in a solution.
Abstract:
This invention provides for novel methods of identifying covalent modifications of an amino acid residue in a polypeptide chain by detecting mass differences.
Abstract:
Method for analyzing adducts in a fluid and/or a solid material suspected of containing the adducts by bringing the material in contact with an isothiocyanate reagent containing a fluorescent. The reagent do not have the isothiocyanate group directly bound to an unsubstituted phenyl or pentafluorophenyl group. A method for manufacturing a standard material for use in the analyzing method, a standard material obtainable by this manufacturing method. Compounds suitable for use as standard material and use of the standard material, and a container for analyzing the adducts are also disclosed. A method for analyzing hazardous substances, a kit including standard material or a compound set out above, an apparatus for performing the analyzing method, and a computer program stored on a data carrier for performing the analyzing method or the manufacturing method are also disclosed.
Abstract:
The present invention relates to a method of identifying a polypeptide, which method comprises the steps of (a) derivatization of the N-terminus of the polypeptide, or the N-termini of one or more peptides of the polypeptide, with at least one acidic reagent which comprises a sulfonyl moiety coupled to an activated acid moiety to provide one or more peptide derivatives; analyzing at least one such derivative using a mass spectrometric technique to provide a fragmentation pattern, and (c) interpreting the fragmentation pattern obtained, wherein the peptide or polypeptide is immobilized to a solid support at least during step(a). Furthermore, the present invention also relates to a kit for identifying a polypeptide by a mass spectrometric technique.
Abstract:
Respective monoclonal antibodies are fixed into respective wells of a microplate one by one, and bonded with labeled analogs of PTH amino acid derivatives. A solution containing PTH amino acid derivatives obtained by Edman degradation is dripped on to the microplate for causing competitive reaction to the monoclonal antibodies with the analogs, and thereafter non-bonded PTH amino acid derivatives and liberated analogs are washed out. Then enzyme-labeled antibodies against the analogs are added and the quantity of bonded enzyme-labeled antibodies is measured thereby determining the types and quantities of the PTH amino acid derivatives. Constitutive amino acid can be detected in high sensitivity.
Abstract:
The present invention provides a novel internal standard for amino acid sequencing which contains a peptide consisting of unnatural amino acid residues, such as ornithine, norvaline, norleucine and .alpha.-aminobutyric acid, that is capable of being sequenced simultaneously with an unknown peptide or protein without interfering with the analysis. The internal standard peptide has an amino acid sequence containing at least two different unnatural amino acid residues having retention times distinct from the corresponding retention times for natural amino acid residues. Information derived from the sequencing of the internal standard allows determination of repetitive yield, lag, N-terminal blockage and discrimination between blank cycles caused by missed injection and blank cycles caused by faulty delivery of chemicals during the sequencer reactions. The present invention further provides novel synthetic control peptides containing from about 3 to 100 natural amino acid residues that are designed for use in monitoring the proper operation of amino acid sequencers and to monitor peptide or protein cleavage reactions. The control peptide, or mixture of control peptides, are designed to obtain data for many or all common, uncommon and difficult to measure amino acids within 15 sequencer cycles and to provide cleavage sites for at least 4 different amino acid cleavage reactants.
Abstract:
A novel reactor for reacting and subsequently analyzing sub-picomole quantities of a sample organic molecule. The reactor includes a continuous capillary connected between two valves that control fluid flow in the capillary. One part of the capillary forms a reaction chamber where the sample may be immobilized for subsequent reaction with reagents supplied through the valves. Another part of the capillary passes through or terminates in the detector portion of an analyzer such as an electrophoresis apparatus, liquid chromatographic apparatus or mass spectrometer. The apparatus may form a peptide or protein sequencer for carrying out the Edman degradation reaction and analyzing the reaction product produced by the reaction. The protein or peptide sequencer includes a reaction chamber for carrying out coupling and cleavage on a peptide or protein to produce derivatized amino acid residue, a conversion chamber for carrying out conversion and producing a converted amino acid residue and an analyzer for identifying the converted amino acid residue. The reaction chamber may be contained within one arm of a capillary and the conversion chamber is located in another arm of the capillary. An electrophoresis length of capillary is directly capillary coupled to the conversion chamber to allow electrophoresis separation of the converted amino acid residue as it leaves the conversion chamber. Identification of the converted amino acid residue takes place at one end of the electrophoresis length of the capillary.
Abstract:
The present invention provides methods and reagents for sequencing amino acids. One embodiment of the method for determining the terminal amino acid of a substantialy pure polypeptide comprises the steps of (a) attaching the polypeptide to a solid support, (b) reacting the polypeptide with a compound described below, under conditions and for a time sufficient for coupling to occur between the terminal amino acid of the polypeptide and the compound, thereby yielding a polypeptide with a derivatized terminal amino acid, (c) washing the solid support to remove unbound material, (d) cleaving the derivatized terminal amino acid from the polypeptide with a cleaving agent, (e) ionizing the cleaved derivatized terminal amino acid, and (f) determining the molecular weight of the derivatized terminal amino acid, such that the terminal amino acid is determined.Within one embodiment, the compound is p-isothiocyanato phenethyl trimethylammonium and counterion salts thereof.