54 results about "Protein Sequence Determination" patented technology

Methods, compositions, kits, and apparatus are provided wherein the aminoacyl-tRNA synthetase system is used to analyze amino acids. The method allows very small devices for quantitative or semi-quantitative analysis of the amino acids in samples or in sequential or complete proteolytic digestions. The methods can be readily applied to the detection and/or quantitation of one or more primary amino acids by using cognate aminoacyl-tRNA synthetase and cognate tRNA. The basis of the method is that each of the 20 synthetases and/or a tRNA specific for a different amino acid is separated spatially or differentially labeled. The reactions catalyzed by all 20 synthetases may be monitored simultaneously, or nearly simultaneously, or in parallel. Each separately positioned synthetase or tRNA will signal its cognate amino acid. The synthetase reactions can be monitored using continuous spectroscopic assays. Alternatively, since elongation factor Tu:GTP (EF-Tu:GTP) specifically binds all AA-tRNAs, the aminoacylation reactions catalyzed by the synthetases can be monitored using ligand assays. Microarrays and microsensors for amino acid analysis are provided. Additionally, amino acid analysis devices are integrated with protease digestions to produce miniaturized enzymatic sequenators capable of generating either N- or C-terminal sequence and composition data for a protein or peptide. The possibility of parallel processing of many samples in an automated manner is discussed.

The methods and apparatus, disclosed herein are of use for sequencing and/or identifying proteins, polypeptides and/or peptides. Proteins containing labeled amino acid residues may be synthesized and passed through nanopores. A detector operably coupled to a nanopore may detect labeled amino acid residues as they pass through the nanopore. Distance maps for each type of labeled amino acid residue may be compiled. The distance maps may be used to sequence and/or identify the protein. Apparatus of use for protein sequencing and/or identification is also disclosed herein. In alternative methods, other types of analytes may be analyzed by the same techniques.

In a mass spectrometer, sample ions are produced by using matrix assisted laser desorption with a matrix substance that supports spontaneous, non-ergodic ISD fragmentation and a laser light source with nanosecond light pulses and a multiple spot beam profile. A plurality of individual time-of-flight spectra are recorded from the resulting ions in such a way that amplification of ion signals in the mass spectrometer detector is initially reduced so that only ions with masses near a mass range limit are initially recorded. During the repeated acquisitions of the individual time-of-flight spectra, both the detector amplification and the mass range limit are increased. By these methods, it is possible to evaluate c and z fragment ions in lower mass ranges and to directly read N-terminal sequences from near terminus up to 80 amino acids and beyond, and C-terminal sequences up to more than 60 amino acids.

A control system and apparatus for use with laser ionization is provided. In another aspect of the present invention, the apparatus includes a laser, pulse shaper, detection device and control system. A further aspect of the present invention employs a femtosecond laser and a mass spectrometer in yet other aspects of the present invention, the control system and apparatus are used in MALDI, chemical bond cleaving, protein sequencing, photodynamic therapy, optical coherence tomography and optical communications processes.

The invention provides a device for determining the type of protein in a liquid, the device comprising (a) an immobilized ATP dependent protease based molecular transporter machine configured to guide a protein that is functionalized with labels through a detection area of a detector, (b) said detector, configured to detect a signal as function of the labels of the labelled amino acids, (c) a processor unit, configured to identify from the detector signal a sequence of amino acids of the functionalized protein, wherein the processor unit is further configured to compare the identified sequence of amino acids with the occurrence of such sequence in a database of proteins and to identify the type of protein.

Described are optical methods and reagents for sequencing polypeptides. A probe that exhibits different spectral properties when conjugated to different N-terminal amino acids is conjugated to the N-terminal amino acid of a polypeptide. Sequentially detecting one or more spectral properties of the probe conjugated to the N-terminal amino acid and cleaving the N-terminal amino acid produces sequence information of the polypeptide. The use of super-resolution microscopy allows for the massively parallel sequencing of individual polypeptide molecules in situ such as within a cell. Also described are probes comprising hydroxymethyl rhodamine green, an isothiocyanate group and a protecting group.

The present disclosure provides an improved field effect transistor and device that can be used to sense and characterize a variety of materials. The field effect transistor and/or device including the transistor may be used for a variety of applications, including genome sequencing, protein sequencing, biomolecular sequencing, and detection of ions, molecules, chemicals, biomolecules, metal atoms, polymers, nanoparticles and the like.

The invention discloses a single-layer mica sheet and a preparation method and application of a nanopore electronic device thereof. The method comprises the steps that an ultrathin single mica layer is prepared and coats a proper supporting substrate, and a high-energy focusing electronic beam or an ion beam is used for preparing nanopores of the specification being 1-5 nm in the single-layer mica sheet to obtain a solid-state nanopore electronic device based on the single-layer mica sheet. Single-stranded nucleic acid or protein molecules are driven by an electric field to penetrate through the nanopores in the electronic device, and a basic group on the single-stranded nucleic acid penetrating through the pores or amino acid on the single-stranded protein is recognized by detecting changes of via-pore current in real time. A high throughput parallel molecular device can be prepared from the electronic device, and rapid and ultralow cost nucleic acid/protein sequencing can be achieved.

The invention relates to a monodisperse nanolamella-based nanometer single hole, and a making method and an application thereof. The nanometer single hole is positioned in the nanometer tip of a capillary tube, and is formed by a monodisperse nanolamella capping the tip of the capillary tube, and the aperture of the nanometer single hole is 10-100 nm. The metal nanometer single hole has the advantages of simple making method, low cost, small dimension and controllable structure, and can be combined with Raman spectrum as an electrochemical device to realize electrochemical controllable single molecule detection and realize the identification of single bases, so a method is provided for DNA sequencing and even protein sequencing.

The invention provides a method for protein/polypeptide sequencing based on Aerolysin nanopores. The method realizes specific resolution of natural amino acid and post-translational modification thereof and accurate acquisition of a single-molecule protein sequence, and comprises the following steps: (1) carrying out protein unfolding; (2) marking an end position sequencing starting point; (3) carrying out electrified preliminary screening; (4) unfolding a polypeptide tertiary structure; (5) carrying out amino acid orthogonal recognition; (6) carrying out limited range perturbation assisted amino acid recognition; and (7) carrying out single molecule protein sequence determination. According to the method, an innovative method for accurate measurement of single protein molecule amino acidsequence and post-translational modification is established for sensitive detection of information of 20 amino acid sequences.

A method for the selective fragmentation of peptides using free radical initiator-peptide conjugates is provided. Free radical initiated peptide sequencing, or FRIPS, consists of covalently attaching a free radical initiator to a peptide and collisionally activating this conjugate. This results in fragment formation. Subsequent collision-activated dissociation further dissociates the fragments, producing a group of ions based on the interaction of the free radical initiator and the target molecule. The methodology is applied to the fundamental study of biologically relevant reactions of free radicals with peptides and proteins in the gas phase, as well as to a completely gas-phase approach to protein sequencing.

The present invention provides a method for isolating and purifying immuno-modulating polypeptide from cow placenta, which is characterized by using the steps of anion-exchange chromatography, gel exclusion chromatography and reverse-phase high performance liquid chromatography to isolate and purify immuno-modulating polypeptide from cow placenta, identifying its activity of stimulating lymphocyte proliferation in vitro by MTT method, then determining its molecular weight by MALDI-TOF-MS, its isoelectric point by CIEF and its amino acid sequence with analyzer for protein sequencing. Since the obtained immuno-modulating polypeptide by the method according to the present invention has more than 90% purity, its bioactivity can reach medicinal standards.

The present disclosure provides an improved device that can be used to sense and characterize a variety of materials. The device may be used for a variety of applications, including genome sequencing, protein sequencing, biomolecular sequencing, and detection of ions, molecules, chemicals, biomolecules, metal atoms, polymers, nanoparticles and the like.

Systems and methods are described for producing an amplitude-modulated laser pulse train. The laser pulse train can be used to cause fluorescence in materials at which the pulse trains are directed. The parameters of the laser pulse train are selected to increase fluorescence relative to a constant-amplitude laser pulse train. The amplitude-modulated laser pulse trains produced using the teachings of this invention can be used to enable detection of specific molecules in applications such as gene or protein sequencing.

Identifying proteins and peptides, and more specifically large-scale sequencing of single peptides in a mixture of diverse peptides at the single molecule level is an unmet challenge in the field of protein sequencing. Herein are methods for identifying amino acids in peptides, including peptides comprising unnatural amino acids. In one embodiment, the N-terminal amino acid is labeled with a first label and an internal amino acid is labeled with a second label. In some embodiments, the labels are fluorescent labels. In other embodiments, the internal amino acid is Lysine. In other embodiments, amino acids in peptides are identified based on the fluorescent signature for each peptide at the single molecule level.

The invention relates to a method for identifying a transcription factor binding element in a cotton fiber development period by DNA affinity protein sequencing. The method comprises the following steps of: 1) extracting cotton fiber genome DNA, randomly breaking into fragments of about 200bp, and constructing an Index-DNA library with a sequencing joint by using the broken DNA; 2) performing prokaryotic expression on a cotton transcription factor protein with a label, and performing immunoblotting to confirm the expressed target protein; 3) incubating the target protein and the Index-DNA library in vitro to fully combine the target protein and the Index-DNA library, and extracting Index-DNA specifically bound with the protein; and 4) performing amplification and sequencing, matching the obtained data to a cotton genome, and identifying and confirming the sequence of the obtained binding element after the obtained data corresponds to a DHS site in the cotton fiber development period. The method provided by the invention can quickly and accurately identify the downstream binding site of the cotton transcription factor without genetic transformation, and has the advantages of being fast, accurate, economical, labor-saving and the like.

The invention relates to a nano single hole based on a capillary tip, a preparation method and application thereof. The nano single hole is characterized in that the inner side wall of a capillary tip is provided with a deposition layer, the deposition layer extends out of a capillary to form a hollow conical structure, and a nano single hole is located at the tip of the conical structure. According to the invention, the nano single hole is simple in preparation method, low in cost, small in size and controllable in structure, and can be used as an electrochemical device to be combined with Raman spectroscopy; and bias voltage is applied to the two ends of a nanotube, so that the detection of a single molecule with a small size by dynamic Raman is realized, the detection of a single protein molecule based on current and Raman spectrum is realized, and a new method is provided for DNA sequencing and protein sequencing.

The invention discloses an amino acid configuration analysis method and an N-polypeptide end sequence sequencing method of polymyxin B. A liquid phase purification method of a polymyxin B component isestablished, and polymyxin B1, polymyxin B2 and polymyxin B1-I can be rapidly purified and separated from the polymyxin B component. A preparation method and a liquid phase purification method of thepolymyxin B enzymolysis component are established, and the enzymolysis components of polymyxin B1, polymyxin B2 and polymyxin B1-I can be rapidly purified and separated; polymyxin B component hydrolysis-amino acid chiral derivation-liquid chromatography-mass spectrometry are adopted to determine the amino acid configuration; the N-polypeptide terminal sequence is determined by combining enzymolysis of the polymyxin B component, liquid chromatography purification and protein sequencing, so that a research basis is provided for strictly controlling the quality of polymyxin B.

The invention, in part, includes methods of single molecule protein sequencing that include using weak binding spectra in the amino acid identification.