146 results about "Protein subunit" patented technology

The present invention is directed to telomerase nucleic acids and amino acids. In particular, the present invention is directed to nucleic acid and amino acid sequences encoding various telomerase protein subunits and motifs, including the 123 kDa and 43 kDa telomerase protein subunits of Euplotes aediculatus, and related sequences from Schizosaccharomyces, Saccharomyces sequences, and human telomerase. The present invention is also directed to polypeptides comprising these telomerase protein subunits, as well as functional polypeptides and ribonucleoproteins that contain these subunits.

The present invention is directed to novel telomerase nucleic acids and amino acids. In particular, the present invention is directed to nucleic acid and amino acid sequences encoding various telomerase protein subunits and motifs, including the 123 kDa and 43 kDa telomerase protein subunits of Euplotes aediculatus, and related sequences from Schizosaccharomyces, Saccharomyces sequences, and human telomerase. The present invention is also directed to polypeptides comprising these telomerase protein subunits, as well as functional polypeptides and ribonucleoproteins that contain these subunits.

Disclosed are useful constructs and methods for the expression of proteins using primary translation products that are processed within a recombinant host cell. Constructs comprising a single open reading frame (sORF) are described for protein expression including expression of multiple polypeptides. A primary translation product (a pro-protein or a polyprotein) contains polypeptides such as inteins or hedgehog family auto-processing domains, or variants thereof, inserted in frame between multiple protein subunits of interest. The primary product can also contain cleavage sequences such as other proteolytic cleavage or protease recognition sites, or signal peptides which contain recognition sequences for signal peptidases, separating at least two of the multiple protein subunits. The sequences of the inserted auto-processing polypeptides or cleavage sites can be manipulated to enhance the efficiency of expression of the separate multiple protein subunits. Also disclosed are independent aspects of conducting efficient expression, secretion, and/or multimeric assembly of proteins such as immunoglobulins. Where the polyprotein contains immunoglobulin heavy and light chain segments or fragments capable of antigen recognition, in an embodiment a selectable stoichiometric ratio is at least two copies of a light chain segment per heavy chain segment, with the result that the production of properly folded and assembled functional antibody is made. Modified signal peptides, including such from immunoglobulin light chains, are described.

The invention provides compositions and methods related to human telomerase reverse transcriptase (hTRT), the catalytic protein subunit of human telomerase. The polynucleotides and polypeptides of the invention are useful for diagnosis, prognosis and treatment of human diseases, for changing the proliferative capacity of cells and organisms, and for identification and screening of compounds and treatments useful for treatment of diseases such as cancers.

A novel i-antigen protein from Ichthyophthirius multifiliis is effective to induce a protective immune response in fish. The invention includes antigenic and membrane-targeting sequences of i-antigen proteins, nucleic acid molecules that encode antigenic or membrane-targeting portions of i-antigen proteins, DNA and protein subunit vaccines, methods of inducing an immune response in fish and methods for detection and characterization of I. multifiliis.

Methods and constructs for genetic manipulation of one or more of shrimp, shellfish, mollusks, and fish are disclosed. The nucleic acid construct includes a promoter and an internal ribosome entry site of an insect picomavirus, such as a cricket paralysis-like picomavirus. One or more open reading frames can be operably associated with one or both of the promoter and the internal ribosome entry site, and one or more proteins or protein subunits can be expressed upon introduction of the construct into a host cell, such as into a shrimp. Method for producing immortalized crustacean cell lines using enhancer elements derived from shrimp and/or shrimp viruses are also described.

The present invention is directed to novel telomerase nucleic acids and amino acids. In particular, the present invention is directed to nucleic acid and amino acid sequences encoding various telomerase protein subunits and motifs, including the 123 kDa and 43 kDa telomerase protein subunits of Euplotes aediculatus, and related sequences from Schizosaccharomyces, Saccharomyces sequences, and human telomerase. The present invention is also directed to polypeptides comprising these telomerase protein subunits, as well as functional polypeptides and ribonucleoproteins that contain these subunits.

The invention provides a method for producing porcine circovirus type II capsid protein by utilizing a silkworm bioreactor, and belongs to the field of biotechnology. In the method, by taking a bombyx nuclear polyhedrosis virus as a vector, porcine circovirus type II capsid protein genes are integrated into a polyhedrosis promoter of the bombyx nuclear polyhedrosis virus so as to express target protein by a mode of the homologous recombination of a homologous arm of the nuclear polyhedrosis virus in a transfer vector and bombyx nuclear polyhedrosis virus (BmNPV) genes; a recombinant bombyx nuclear polyhedrosis virus containing target protein genes is obtained by a plaque sieving method, and the target protein is expressed in large scale by using a bombyx bioreactor so as to prepare a subunit vaccine containing recombinant porcine circovirus type II capsid protein; and piglet infection experiments verify that the subunit vaccine has the excellent immune protective effect. The method has the characteristics of high expression efficiency, good activity of the target protein, low production cost and the like, and is suitable for large-scale production.

The invention discloses a novel chicken infectious bursal disease virusVP 2c DNA (SEQ ID NO: 1), construction of its expression carrier, expressed recombined VP2 protein and the application of said recombined protein in preparing subunit genetic engineering vaccine against chicken infection bursal disease virus. The chicken infectious bursal disease virusVP 2c DNA can be highly expressed in yeast cell, and expressed recombined protein possesses biological activity and immunogenicity of the chicken infectious bursal disease virus natural protein . The expressed recombined protein can be produced into vaccine, and it is demonstrated through immunity chicken test that: the protein subunit vaccine can effectively induce body to generate spcial humoral immune response, make immunity chicken get 90% protection from deadly attack of highly pathogenic vv IBDV, and effectively prevent virus proliferation in the body.

The invention discloses food grade lactic acid bacteria active carrier Group A rotavirus vaccine and a preparation method thereof. The food grade lactic acid bacteria active carrier Group A rotavirus vaccine is characterized in that VP6 antigen protein from Group A virus, common serotype VP7 antigen protein (P serotype) and VP4 antigen protein (G serotype-expressed separately in the form of VP5* and VP8* protein subunit), vaccine adjuvant escherichia coli thermal unstable toxin B (LTB) and cholera toxin subunit B (CTB) are expressed and secreted by thyA gene deletion lactic acid bacteria cell or shown by the cell wall. Expressions of antigen protein and vaccine adjuvant protein are controlled by inducible or constitutive promoter, protein expression cassette is integrated onto the chromosome of the expression host lactic acid bacteria strain, and external antibiotics resistance gene introduced in gene manipulation is removed. The lactic acid bacteria active carrier rotavirus vaccine has the advantages of having wide serotype covering range, being easy to produce in large scale, and being safe and convenient to use without a refrigerator and a needle tubing.

The invention provides an anti-chicken infectious bursal disease (IBD) recombinant protein subunit vaccine. The vaccine is a fusion protein having high immunogenicity of Salmonella typhimurium flagellin and an infectious bursal disease virus (VP2). The above flagellin + VP2 fusion protein is obtained through the expression of a recombinant baculovirus containing a flagellin + VP2 gene by utilizing a Bac-to-Bac baculovirus expression system. The recombinant baculovirus obtained through the system has a short period, and the expressed flagellin + VP2 fusion protein has high immune protection force.

The invention relates to a detection kit for helicobacter pylori virulence protein antibody and a detection method by using the same. The kit comprises a microwell plate, an enzyme-labeled secondary antibody, a negative control serum, a positive control serum, a substrate, a stop buffer and a washing liquor, wherein the microwell plate is coated with purified recombinant helicobacter pylori virulence proteins, the substrate is a solution containing 1% m/m 3, 3', 5, 5'-tetramethyl benzidine and 30% v/v hydrogen peroxide, and the recombinant helicobacter pylori virulence proteins are cytotoxin-associated protein CagA, vacuolating toxin protein VacA, flagellum protein subunit A, flagellum protein subunit B, urease subunit A, and urease subunit B. According to the invention, six purified helicobacter pylori virulence proteins are used as antigens which itself have high conservatism and specificity and are related to the symptom of a patient, so the kit has characteristics of high specificity, identification capacity for helicobacter pylori clinical strain virulence strength, and semi-quantitative detection capacity.

The invention discloses protein ompK subunit vaccine of assistant haemolysis vibrio extine and a preparation method thereof. The vaccine is PBS solution which converts the recombination protein of the coliform bacteria of recombination prokaryon expression plasmid pET30a-ompK expressed by inducing and after being purified; the concentration of the PBS solution is 0.25-0.5mg/ml. The method has the steps that: firstly, the extraction of an assistant haemolysis vibrio full gene group, the overall length of extine protein ompK DNA and the clone of a mature peptide coded sequence; secondly, the construction of a prokaryon expression plasmid of the ompK mature peptide coded sequence, thirdly, the obtaining way of the recombination ompK protein; fourthly, the detection to the immunity way and the immunity effect of a large yellow croaker with recombination ompK protein. The invention provides the preparation method of the assistant haemolysis vibrio ompK protein subunit vaccine, and simultaneously provides the detection method of the immunity effect of the large yellow croaker with recombination ompK protein, the preparation method is simple, and the usage is convenient.

A protein construct comprising a pilus protein portion, preferably a structurally stabilized pilus-protein, and an additional, or effector, portion other than a pilus protein or chaperone and wherein said effector portion serves to stabilize the pilus protein portion and to confer a therapeutic activity, such as vaccine activity or anti-microbial or anticancer activity, on the protein construct is disclosed. Such effector portion commonly comprises a donor strand complementary segment capable of structurally stabilizing a pilus protein subunit and attaching the auxiliary portion to said subunit to form the pilus protein analog of the invention. Methods of using said protein constructs are also disclosed as well as the formation and use of analogs comprising fragments of a pilus protein linked to effector components to produce immunogenic and/or therapeutic activity.

The preparation process of reovirus antigen subunit vaccine for grass carp includes the following steps: proliferation of GCRV873, which is the Hunan Shaoyang strain of reovirus, in grass carp kidney cell line; centrifugal purification and concentration of GCRV873 infected cell virus suspension; processing purified virus with surfactant to disintegrate complete virus structure to form viral nucleic acid and capsid protein subunit component; digesting with nuclease to degrade free virus genome dsRNA; dialysis to obtain reovirus protein subunit antigen preparation for grass carp containing no nuclease; and diluting with physiological saline to obtain the said vaccine. The vaccine of the present invention has the advantages of containing complete virus protein antigen component, containing no genetic virus matter RNA, simple preparation process, high product purity, etc.

Complex viruses are assembled from simple protein subunits by sequential and irreversible assembly. During genome packaging in bacteriophages, a powerful molecular motor assembles at the special portal vertex of an empty prohead to initiate packaging. An aspect of the invention relates to the phage T4 packaging machine being highly promiscuous, translocating DNA into finished phage heads as well as into proheads. Single motors can force exogenous DNA into phage heads at the same rate as into proheads and phage heads undergo repeated initiations, packaging multiple DNA molecules into the same head. This shows that the phage DNA packaging machine has unusual conformational plasticity, powering DNA into an apparently passive capsid receptacle, including the highly stable virus shell, until it is full. These features allow for the design of a novel class of nanocapsid delivery vehicles.

The invention discloses application of SARS-COV-2 Spike protein in detection of 2019 novel coronavirus. According to the invention, the HEK293 cell strain capable of stably and highly expressing the S1 protein subunit recombinant protein of the SARS-COV-2 Spike protein is obtained, and the S1 protein subunit recombinant protein of the SARS-COV-2 Spike protein is applied to the development of an immunochromatographic detection reagent. According to the invention, the SARS-COV-2 Spike protein S1 protein subunit recombinant antigen is used as a marking material and is applied to a gold-labeled immunochromatography system; the detection system adopts direct labeling capture, and compared with an IgM/IgG detection product taking prokaryotic expression SARS-COV-2 NP recombinant protein as a coating, the SARS-COV-2 Spike protein have greatly improved sensitivity and specificity.

The invention discloses a polylysine oligomer modified recombined apoferritin nanometer cage and a preparation thereof. The nanometer cage is a recombined apoferritin cage with the surface modified by polylysine oligomer that is acquired in the manner of self-assembling protein subunits into hollow spherical protein and utilizing a genetic recombination expression technique to modify different amount of lysine at the N terminal of the protein subunits. The protein nanometer cage can realize the depolymerization and recombination of the protein subunits by changing the solution pH so as to realize the drug loading; the biocompatibility and the in vivo stability are high; the nanometer cage can specifically recognize the high-expression transferrin receptor on the tumor cell surface, so as to realize the active targeting; after the recombined apoferritin nanometer cage is introduced into the cells under the endocytosis effect, the lysosome escape is realized through the proton sponge effect under the lysosome acid environment under the effect of polylysine residue, so that the drug in the protein cage can be protected from being degraded in the lysosome; the recombined apoferritin nanometer cage is expected to have an excellent application prospect at the aspects of gene drug delivery, drug organelle targeting delivery, and the like.

The invention provides compositions and methods related to human telomerase reverse transcriptase (hTRT), the catalytic protein subunit of human telomerase. The polynucleotides and polypeptides of the invention are useful for diagnosis, prognosis and treatment of human diseases, for changing the proliferative capacity of cells and organisms, and for identification and screening of compounds and treatments useful for treatment of diseases such as cancers.

The invention provides compositions and methods related to human telomerase reverse transcriptase (hTRT), the catalytic protein subunit of human telomerase. The polynucleotides and polypeptides of the invention are useful for diagnosis, prognosis and treatment of human diseases, for changing the proliferative capacity of cells and organisms, and for identification and screening of compounds and treatments useful for treatment of diseases such as cancers.

The invention provides an avian adenovirus fiber protein subunit vaccine. A new-type antigen fiber protein of an avian adenovirus is used, after a sequence is optimized, the fiber protein acquires soluble expression in escherichia coli, and an expression product is used for preparing the subunit vaccine, wherein an amino acid sequence of the avian adenovirus fiber antigen protein is SEQ ID NO: 4,and a nucleotide sequence of an encoding gene thereof is SEQ ID NO: 3. The subunit vaccine prepared by the avian adenovirus fiber protein has the characteristics of high antigen stability, high purity, strong specificity, no generation of other uncorrelated antibodies, and convenient and accurate detection method. A firm foundation is established for industrially producing the avian adenovirus subunit vaccine and diagnostic reagent.