36 results about "C protein" patented technology

The invention discloses a recombined human cystatin-C protein with natural activity and a preparation method thereof. According to the preparation method, lots of stable recombined human cystatin-C proteins are expressed and purified by employing a gene engineering technique, and the recombined human cystatin-C proteins are cut by utilizing the protease, so that the recombined human cystatin-C protein has high natural activity. The recombined human cystatin-C protein can be used for immune preparation of monoclonal antibodies and multi-antibody blood serum, and excellent raw materials are provided for preparing stable cystatin-C detection agents and quality control products thereof.

The invention provides a nutrient medium composition and associated methods for lengthening the useful life of a culture of muscle cells. Disclosed is a method of culturing mammalian muscle cells, including preparing one or more carriers coated with a covalently bonded monolayer of trimethoxy-silylpropyl-diethylenetriamine (DETA); verifying DETA monolayer formation by one or more associated optical parameters; suspending isolated fetal rat skeletal muscle cells in serum-free medium according to medium composition 1; plating the suspended cells onto the prepared carriers at a predetermined density; leaving the carriers undisturbed for cells to adhere to the DETA monolayer; covering the carriers with a mixture of medium 1 and medium 2; and incubating. A cell nutrient medium composition includes Neurobasal, an antibiotic-antimycotic composition, cholesterol, human TNF-alpha, PDGF BB, vasoactive intestinal peptides, insulin-like growth factor 1, NAP, r-Apolipoprotein E2, purified mouse Laminin, beta amyloid, human tenascin-C protein, rr-Sonic hedgehog Shh N-terminal, and rr-Agrin C terminal.

The invention discloses an indirect ELISA (enzyme-linked immuno sorbent assay) kit for detecting a haemophilus parasuis antibody. The kit consists of an ELISA coating plate with haemophilus parasuis cytolethal distending toxin)-C protein serving as a coating antigen, a to-be-detected sample dilution plate, a positive contrast serum, a negative contrast serum, 20-time concentrated washing liquid, a serum sample dilution solution, an enzyme-labeled antibody working solution, a developing solution and a terminating solution. A judgment standard is that if an S / P value is less than 0.200, a sample to be detected is negative; if the S / P value is greater than or equal to 0.200, the to-be-detected sample is positive; the S / P value is obtained according to a formula: S / P value=(the mean value of the to-be-detected sample OD450nm-the mean value of a negative contrast OD450nm) / (the mean value of a positive sample OD450nm-the mean value of the negative contrast OD450nm). Due to the specificity test, the sensitivity test, the repetitiveness test, the coincidence rate test, the test for comparing the kit disclosed by the invention with a kit on sale, the clinical application test and the like, the kit disclosed by the invention has the characteristics of high specificity, high sensitivity, high repetitiveness and the like and is high in coincidence rate to the same type of products on sale home and abroad; the indirect ELISA kit can be used for clinical large-scale detection and epidemiological investigation for the haemophilus parasuis antibodies.

The invention discloses an ELISA agent box and usage in the progressive atrophic rhinitis (PAR) as well as rPMT-C recombinant coliform BL21 / pET28b-C2115 (CCTCC NO: M207012) on the C' end of toxigenic pasteurellotic toxin toxA gene and expressing and purifying method of rPMT-C protein, wherein the agent box comprises the following parts: rPMT-C protein on the C' end of toxin toxA gene as enzyme target board, negative, positive standard serum, rabbit anti-swine lgG enzyme target diprevent, sample dilute, substrate display A liquid, substrate display B liquid, stopping liquid and washing liquid.

The invention relates to reconstituted surfactants consisting of artificial phospholipids and peptides able to lower the air-liquid surface tension, more particularly to reconstituted surfactants comprising special phospholipid mixtures and artificial peptides which are analogues of the natural surfactant SP-C protein for the treatment of respiratory distress syndrome (RDS) and other diseases relating to pulmonary surfactant dysfunctions.

The present invention relates to polynucleotides encoding immunogenic HIV type C polypeptides. Uses of the polynucleotides in applications including DNA immunization, generation of packaging cell lines, and production of HIV Type C proteins are also described.

The invention aims to provide a novel duck reovirus compound vaccine and a preparation method of an egg yolk antibody. The preparation method comprises the following steps: mixing recombinant PVAX1-sigma B plasmid containing a novel duck reovirus sigma B protein gene and a novel duck reovirus sigma C protein according to a certain ratio, and performing emulsifying with a white oil adjuvant to prepare the compound vaccine. The average antibody titer of eggs collected 7-150 days after the three times of immunization reaches 1:1024 or above, and the highest antibody titer can reach 1:4096. The egg yolk antibody product prepared by extracting and purifying hyper-immune eggs can provide complete protection for ducks infected with the novel duck reovirus. The novel duck reovirus egg yolk antibody prepared by the method disclosed by the invention is definite in effect and low in cost, and has remarkable economic and social benefits.

The present invention relates to polynucleotides encoding immunogenic HIV type C polypeptides. Uses of the polynucleotides in applications including DNA immunization, generation of packaging cell lines, and production of HIV Type C proteins are also described.

An isolated polypeptide comprising an amino acid sequence corresponding to the amino acid residues forming a full or partial alpha-helical domain, the hinge domain, the beta-triple spiral domain and afull or partial globular head domain of an avian reovirus sigma C protein, and lacking the amino acid sequence that is N-terminal to said alpha-helical domain is provided. Furthermore, a vaccine comprising, or a viral vector expressing, at least one of the isolated polypeptides of the present invention is provided.

The invention discloses a resistance marker-free porcine actinobacillus pleuropneumoniae (APP) serum type 7 double-gene defective strain, and belongs to the technical field of bacterial gene engineering. The recombinant strain APPdeltaclpPdeltaapx II C of APP is obtained by inactivating ClpP protease in the APP and a coded gene of a hemolysin activated factor Apx II C by adopting a directional homologous recombination technology, and expression of the ClpP protease and the Apx II C protein is destroyed. The obtained double-gene defective strain has lower toxicity compared with a parent strain, is safe to animals, provides an important basis for transformation of porcine contagious pleuropneumonia (PCP) vaccines and research of matched identification and diagnosis reagents, and has great significance for promoting elimination and purification of the global PCP.

Monoclonal antibodies, which can be produced in vitro, against cardiac epitopes of the human My-C are produced by generating myeloma cell clones that produce such specific antibodies having epitope specificity. These monoclonal antibodies allow, among other things, the creation of an enzyme-linked immunosorbent assay (ELISA) for the specific, cross-reactivity-free quantitative determination of My-C in serum, plasma, whole blood or other body fluid. Specifically, a hybridoma cell clone producing a monoclonal antibody that detects and binds a cardiac epitope in the My-C is produced, which has no cross-reactivity with respect to the myosin-binding proteins of the skeletal muscles. The hybridoma cell line can be obtained by fusing myeloma cells with spleen cells of a test animal, in particular a mouse, immunized against recombinant My-C. The invention furthermore relates to epitope-specific antibodies produced by the hybridoma cell line, and to the use thereof.

The invention provides self replicating infectious recombinant paramyxoviruses where the P and C genes are separated rated. The recombinant paramyxoviruses preferably have one or more attenuating mutations and / or at least one temperature sensitive mutation and one non-temperature sensitive mutation. In some embodiments, the recombinant paramyxovirus has a separate variant polynucleotide encoding a C protein and a separate monocistronic polynucleotide encoding a P protein. Also provided are compositions and methods for using the recombinant paramyxoviruses as described herein.

Methods and compositions for rapidly replacing cMyBP-C in sarcomeres featuring the creation of Spy-C mice, which are mice genetically engineered to express cMyBP-C with a protease recognition site and SpyTag peptide introduced into the cMyBP-C gene. In permeabilized myocytes from the Spy-C mice, the cMyBP-C protein can be cleaved at the protease recognition site, and the N-Terminus of cMyBP-C can be removed while the C-terminus remains anchored to the thick filament. A new peptide featuring the SpyCatcher sequence can be covalently bonded to the remaining portion of cMyBP-C, thereby creating a modified cMyBP-C protein. The methods and compositions of the present invention allow for the reconstitution of full-length cMyBP-C at the precise position of native cMyBP-C in the sarcomere and allow for a variety of modifications to be introduced to cMyBP-C in situ.

The invention provides a recombinant TsPKA-C protein and application thereof and particularly relates to application of the recombinant TsPKA-C protein as taenia solium / cysticercerci detection antigen and application of the recombinant TsPKA-C protein to preparation of a porcine cysticercosis detection kit. The recombinant TsPKA-C protein can specifically detect taenia solium / cysticercerci and has no cross reaction with porcine thin-neck cysticercerci, trichinella sui and the like.

The invention discloses a preparation method of C protein detection test paper, namely a handheld reading device. The preparation method comprises the following steps: pasting an NC membrane on a substrate of lateral flow test paper; fixing a prepared detection solution in a detection area on the NC membrane, and fixing the prepared contrast solution in a contrast area on the NC membrane; attaching a combination pad and a water absorption pad to the positions, located on the two sides of the NC membrane, of the substrate respectively, wherein the combination pad and the water absorption pad are both connected with the NC membrane, and a probe of a UCNPs-CRP antibody is arranged on the combination pad; and attaching a sample pad to the position, located on the other side of the combination pad, of the substrate, wherein the sample pad is connected with the combination pad. According to the invention, the UCNPs-CRP antibody probe is arranged on the combination pad, so that the influence of background fluorescence generated by a whole blood sample on the detection performance can be avoided; and the detection area and the control area are arranged on the NC membrane, so that the accuracy of a detection result can be ensured.

The aim of the invention is to produce, in vitro, monoclonal antibodies against cardiac epitopes of the human My-C by generating myeloma cell clones, which produce said specific antibodies with epitope specificity. Said monoclonal antibodies should, amongst other things, enable an ELISA (Enzyme-Linked Immuno Sorbent Assay) for the specific, cross-reactivity free quantitative determination of My-C in serum, plasma or full blood, to be formed. Said aim is achieved by generating a hybridome cell clone which produces a monoclonal antibody which recognizes and binds with a cardiac epitope in the My-C and which does not have the cross-reactivity with respect to the myosin binding proteins of the skeletal muscle. Said hybridome cell line can be obtained by fusing myelome cells with spleen cells of a test animal, in particular a mouse, immunized against recombined My-C. The invention also relates to epitope specific antibodies produced by the hybridome cell lines and to the use thereof.

Methods and means are provided to produce positively charged oligosaccharides in the plant cell wall by introducing into said plant cell a Nodulation C protein fused to a heterologous Golgi signal anchor sequence.

An isolated polypeptide comprising an amino acid sequence corresponding to the amino acid residues forming a full or partial α-helical domain, the hinge domain, the β-triple spiral domain and a full or partial globular head domain of an avian reovirus sigma C protein, and lacking the amino acid sequence that is N-terminal to said α-helical domain is provided. Furthermore, a vaccine comprising, or a viral vector expressing, at least one of the isolated polypeptides of the present invention is provided.

Methods and compositions for rapidly replacing cMyBP-C in sarcomeres featuring the creation of Spy-C mice, which are mice genetically engineered to express cMyBP-C with a protease recognition site and SpyTag peptide introduced into the cMyBP-C gene. In permeabilized myocytes from the Spy-C mice, the cMyBP-C protein can be cleaved at the protease recognition site, and the N-Terminus of cMyBP-C can be removed while the C-terminus remains anchored to the thick filament. A new peptide featuring the SpyCatcher sequence can be covalently bonded to the remaining portion of cMyBP-C, thereby creating a modified cMyBP-C protein. The methods and compositions of the present invention allow for the reconstitution of full-length cMyBP-C at the precise position of native cMyBP-C in the sarcomere and allow for a variety of modifications to be introduced to cMyBP-C in situ.

The invention discloses a method for preparing recombinant cystatin C. Specifically, gene engineering escherichia coli is adopted for recombinant fusion expression of Cys C protein, a specific tag sequence is fused at the N terminal of the expressed Cys C recombinant protein, so that soluble high-efficiency expression in an escherichia coli system is realized, and the protein is high in stability and has excellent immunological activity.

The invention relates to the technical field of biology, in particular to a construction method of human embryonic stem cells. The invention provides the construction method of the human embryonic stem cells, and the construction method comprises the following steps: exogenous polynucleotide for coding B2M-HLA-G1 fusion protein is integrated in a genome of the human embryonic stem cells, the B2M-HLA-G1 fusion protein comprises a first B2M fragment and an HLA-G1 fragment, and the human embryonic stem cells obtained by integration do not express free B2M protein. The endogenous HLA-A, B and C proteins of the human embryonic stem cell line constructed by the construction method of the human embryonic stem cells cannot reach the cell membrane surface, so that the cell line cannot be recognized by CD8 + T cells, the immunological rejection of allogeneic cells can be effectively prevented, and the pluripotency and proliferation ability of the embryonic stem cells are not influenced, and the cell can still be used as a target cell source for future cell transplantation.

The invention provides an application of Def C protein in resisting dengue virus and an expression method of the Def C protein, and particularly provides an application of recombinant Def C protein of aedes albopictus or polypeptide thereof in preparation of drugs for resisting dengue virus. Further, the nucleotide sequence of the recombinant Def C protein is SEQ ID NO: 3, or obtained by substituting, deleting and / or adding one or more nucleotides to the nucleotide sequence as shown in SEQ ID NO: 3 for expressing protein with the same function. The amino acid sequence of the polypeptide is SEQ ID NO: 4. According to the invention, the new application of the Def C protein or the polypeptide thereof in preparation of drugs for resisting dengue virus is disclosed for the first time, thereby providing breakthrough for development of the anti-dengue-virus drug and vaccine preparation field, and having important application value and guiding significance for clinical treatment and related theoretical researches.

The invention discloses a recombined human cystatin-C protein with natural activity and a preparation method thereof. According to the preparation method, lots of stable recombined human cystatin-C proteins are expressed and purified by employing a gene engineering technique, and the recombined human cystatin-C proteins are cut by utilizing the protease, so that the recombined human cystatin-C protein has high natural activity. The recombined human cystatin-C protein can be used for immune preparation of monoclonal antibodies and multi-antibody blood serum, and excellent raw materials are provided for preparing stable cystatin-C detection agents and quality control products thereof.

The invention provides an immunogenic cry1C recombinant protein, which relates to the technical field of genetic engineering, and its amino acid sequence is shown in SEQ ID No.1. The amino acid sequence encoding the cry1C recombinant protein is shorter than the amino acid sequence of the full-length cry1C protein, and the cry1C recombinant protein can immunoreact with the cry1C antibody, and can be used to rapidly and efficiently prepare the cry1C antibody. The present invention also provides a nucleic acid encoding the above immunogenic cry1C recombinant protein, a pair of primers capable of amplifying or detecting the nucleic acid molecule, a vector and a host cell including the nucleic acid molecule, and in addition, the present invention also provides a cry1C Antibody and preparation method thereof, the preparation method can obtain cry1C antibody rapidly and efficiently.

The present invention provides a novel method for the recombinant production of Factor C protein from horseshoe crab using a parasitic protozoan expressing the Factor C protein. In particular, the present invention provides a parasitic protozoan host cell harbouring a polynucleotide encoding horseshoe crab Factor C protein, and a method for producing Factor C protein comprising culturing said parasitic protozoan host cell under conditions such that the cells express the horseshoe crab Factor C protein. Furthermore, the present invention provides recombinant Factor C protein produced by the novel method and its use in the detection and / or removal of endotoxin.

The invention discloses an application of a beauveria bassiana analogue as a small molecular agonist of APC / C. The invention discloses the function of activating APC / C of the beauveria bassiana analogue with the natural source as shown in the formula I for the first time, and the beauveria bassiana analogue is a powerful agonist of a late-stage promoter compound (APC / C-Cdh1) or a late-stage promoter compound (APC / C-Cdc20). As a small molecular agonist of APC / C, the compound has important application value in the research fields of cell physiology change caused by APC / C protein activity disorder, targeted activation of APC / C to control cell proliferation disorder diseases and the like.

The invention relates to a colorectal cancer diagnostic marker, a colorectal cancer detection product and an application thereof. The colorectal cancer diagnostic marker includes multiple secreted proteins, and the multiple secreted proteins include one or two of S100A9 protein and tenascin-c protein, and CEA protein. With the characteristics of high sensitivity and strong specificity, the area under the ROC curve of the diagnostic model is 0.902, and the reliability of the diagnostic result is much higher than that of a single protein marker, which is of great significance for the diagnosis and treatment of colorectal cancer. The colorectal cancer detection product includes the above-mentioned colorectal diagnostic markers. The present invention also proposes the application of colorectal diagnostic markers in the preparation of products for auxiliary diagnosis of colorectal cancer.