69 results about "Host cell filopodium" patented technology

The present invention is directed generally to eukaryotic cells comprising single-celled organisms that are introduced into the eukaryotic cell through human intervention and which transfer to daughter cells of the eukaryotic cell through at least five cell divisions, and methods of introducing such single-celled organisms into eukaryotic cells. The invention also provides methods of using such eukaryotic cells. The invention further provides single-celled organisms that introduce a phenotype to eukaryotic cells that is maintained in daughter cells. The invention additionally provides eukaryotic cells containing magnetotactic bacteria.

The invention belongs to the field of biomedical science, and aims to provide a high metastatic potential hepatoma cell line capable of steady autophagy indication, and an establishment method and an application method thereof. Lentivirus expression vectors containing EGFP (enhanced green fluorescent protein)-LC3 (light chain 3) autophagy reporter genes are constructed and used to infect hepatoma cells with high metastatic potential, so that host cells can express the EGFP-LC3 steadily and efficiently and indicate autophagy changes of the hepatoma cells steadily. To apply the cell line, metastasis research models can be established in vitro and in vivo for the observation on autophagy changes during metastasis, and the cell autophagy changes can be analyzed rapidly and quantitatively by adopting an image analysis method based on Top-hat operators and morphological filter. The high metastatic potential hepatoma cell line has the characteristics that autophagy indication is conducted steadily, reliably and sensitively in a real-time manner, the metastasis occurs definitely, the autophagy is quantified rapidly and accurately, the operation is simple and convenient, and the like, and can greatly facilitate correlation study on autophagy and metastasis.

The invention provides a recombinant lentiviral expression vector, and belongs to the technical field of cell engineering. The recombinant lentiviral expression vector comprises a 21mb gene, a 41BBL gene and an MICA gene which are sequentially connected in series; and the 21mb gene is obtained by sequentially connecting a signal peptide gene, an IL21 gene, a CD8 Hinge gene and a CD8 transmembranegene in series. After the provided recombinant lentiviral expression vector transfects a host cell, the host cell expresses the MICA and the 41BBL, and the IL21 is fused and expressed (but not secreted in a culture environment) on a cytomembrane of the host cell. After the provided recombinant lentiviral expression vector transfects the host cell, an obtained reconstitution cell promotes the highexpression of the NKG2D, avoids excessive activation of an NK cell and prolongs the proliferation time of the NK cell in the process of induction culture of the NK cell.

The present disclosure related to isolated laminin-521, methods for making recombinant laminin-521, host cells that express recombinant laminin-521, and compositions containing laminin-521. Laminin-521 can maintain stem cells in vitro pluripotency, enable self-renewal, and enable single cell survival of human embryonic stem cells. When pluripotent human embryonic stem cells are cultured on plates coated with recombinant laminin-521 (laminin-11), in the absence of differentiation inhibitors or feeder cells, the embryonic stem cells proliferate and maintain their pluripotency. It has also been discovered that human recombinant laminin-521 (laminin-11) provides single cell survival of stem cells after complete dissociation into a single cell suspension. Useful cell culture mediums containing at most 3.9 ng/ml of beta fibroblast growth factor (bFGF) are also described herein.

The present invention provides genetically modified Pichia strains wherein at least one nucleic acid sequence encoding a functional gene product and/or at least one nucleic acid sequence necessary for expression of at least one functional gene product in said Pichia strain is genetically modified, wherein said gene product is responsible for proteolysis and/or glycosylation in said genetically modified Pichia strain. In particular, Pichia strains are provided wherein nucleic acid sequence encoding a functional gene product or expression of said gene product are genetically modified: PEP4, PRB1, YPS1, YPS2, YMP1, YMP2, YMP3 and PMT4. Also provided herein are genetically modified host cells wherein wild type parent of said genetically modified host cell comprises a gene encoding a polypeptide having at least 60% sequence identity to amino acids 1-865 of SEQ ID NO:4, SEQ ID NO:6 and SEQ ID NO:8 wherein said gene is genetically modified in the genome of said host cell such that the gene product is reduced or eliminated in said genetically modified host cell compared with said wild type host cell.

The invention relates to a double-tagging microbial cell biosensor for detecting N-acyl homoserine lactone (AHL), and the biosensor is suitable for detection of AHL and characterization of host cells in the environment. The cell biosensor comprises: Escherichia coli used as host cells for carrying recombinant plasmids; recombinant plasmid containing an ahlI promoter responding to AHL, a cherry red fluorescent protein reporter gene mCherry and an AHL regulatory protein gene ahlR; and a neomycin phosphotransferase promoter gene nptII for characterization of host bacteria, a green fluorescent protein reporter gene gfp and a T1-4 pUC19 plasmid of four terminator rrnb tandem sequence. According to the biosensor, constitutive type of expression green fluorescent protein is used to characterize the host bacteria; the response time to AHL is 6 h; and the minimum detectable concentration of AHL is 50 nmol / L. The biosensor has the advantages of high sensitivity, fast response, low cost and simple operation, and can be widely applied to detection of AHL and host characterization in the environment.

The present invention relates to a method for clarification of, and removal of host cell proteins from, a cell broth consisting essentially of viable cells, a culture medium and a secreted desired biological substance having an overall positive charge in the cell broth by contacting the cell broth with a particulate anion exchanger, allowing an adequate incubation time to result in formation of a cell pellet and a supernatant layer, separating the resulting cell pellet from the supernatant layer. The present invention further relates to a method for the recovery of a secreted desired biological substance from the cell broth by extracting the secreted desired biological substance from the supernatant layer.

Application of a CYP704B2 gene and a coding protein thereof belongs to the technical field of gene engineering. The invention relates to a gene which codes the following protein (a) or (b): (a) a protein consisting of an amino acid sequence shown as SEQ ID NO:2; (b) a protein derived from (a) by substitution, deletion or adding one or a plurality of amino acids on the amino acid sequence of (a), and with aliphatic acid hydroxylase activity. The invention also relates to a plasmid, comprising a gene shown as SEQ ID NO:1. The invention also relates to a host cell, comprising a gene shown as SEQ ID NO:1. The invention also relates to a polypeptide, an amino acid sequence of which is shown as SEQ ID NO:2. The CYP704B2 gene of the invention is an anther specific expressed gene, which can regulate paddy rice anther epidermal layer and pollen extine cutin monomer component synthesis, and deletion of which can specifically lead to paddy rice male sterility.

Disclosed is a transformed cell (a cell model) which can form a cytoplasmic inclusion body derived from TAR DNA-binding protein of 43 kDa (TDP-43) that is found in the brain of a patient suffering from a neurodegenerative disease such as FTLD and ALS. The transformed cell is characterized by having, introduced therein, a promoter capable of functioning in a host cell and a mutant TDP-43 gene.

The invention discloses fusion protein TAT-hGH of human auxin and cell-penetrating peptide TAT as well as a preparation method and application of the fusion protein TAT-hGH. A deoxyribonucleic acid (DNA) sequence of the fusion protein TAT-hGH, a carrier containing the DNA sequence and a host cell containing the carrier are encoded; and a method for preparing the fusion protein TAT-hGH by gene engineering is provided. The fusion protein TAT-hGH has the functions of promoting Jurkat cell proliferation activity and influencing a transcriptional level of insulin-like growth factor (IGF) I of downstream factors; and meanwhile, the fusion protein TAT-hGH has a function of penetrating through intestines. The fusion protein TAT-hGH can be orally taken, enters blood by penetrating through an intestinal cell membrane, and can reach different tissues by blood circulation, so that the utilization ratio of hGH is increased, and the medicinal effect is also improved. The preparation method can be applied to large-scale industrial production, and is high in expression amount, easy to operate and low in cost.

Disclosed herein is a process for producing a target protein, in which a recombinant polynucleotide is constructed to encode a fusion protein including: (i) an anchoring protein that includes a N-terminal amino acid sequence of an ice nucleation protein, so that the fusion protein, once expressed in the host cell, is directed by the anchoring protein to be anchored and exposed on the outer membrane of the host cell; (ii) the target protein; and (iii) a self-splicing protein that includes a first end fused with the anchoring protein and a second end fused with the target protein, wherein the self-splicing protein includes a N-terminal or C-terminal amino acid sequence of an intein protein at the second end thereof, such that upon an environmental stimulus, the self-splicing protein exerts a self-cleavage at the second end thereof to release the target protein from the fusion protein.

The invention pertains to a method for selecting at least one eukaryotic host cell expressing a product of interest, comprising

• • (a) providing a plurality of eukaryotic host cells, wherein cellular viability of said host cells is dependent upon folate uptake, wherein said host cells comprise at least
    • (i) a foreign polynucleotide encoding a product of interest and
    • (ii) a foreign polynucleotide encoding a DHFR enzyme;
  • (b) culturing said plurality of eukaryotic host cells in a selective culture medium comprising at least an inhibitor of DHFR and folate in a limiting concentration; and
  • (c) selecting at least one eukaryotic host cell expressing the product of interest.

Also provided is a method for expressing a product of interest which is based on host cells selected by said method and a cell culture medium.

The invention provides an anti-trophoblast cell-surface antigen-2 chimeric antigen receptor, a T cell, preparing method and application thereof. The anti-trophoblast cell-surface antigen-2 chimeric antigen receptor comprises an anti-trophoblast cell-surface antigen-2 scFv antibody, an IgG4 hinge region, a CD28 transmembrane region, a CD3 intracellular region and a 41BB intracellular region. The invention further provides nucleic acid coding the receptor, a carrier comprising the nucleic acid, and a host cell comprising the carrier. The invention further provides a method for utilizing the carrier for transducing the human CD8+/CD4+T cell to obtain a CARTROP2-T cell. The cell is obtained through gene modification and transformation on the T cell. The receptor can be used for treating diseases related to expression of the trophoblast cell-surface antigen-2, and particularly used for specifically recognizing and killing tumors for expressing the trophoblast cell-surface antigen-2.

The present invention relates to genetically modified host cells, in particular yeast cells, comprising at least one isolated polynucleotide encoding a Killer Expression protease (Kex2p) or a fragment and/or variant thereof which has at least one Kex2p functional activity and at least one isolated polynucleotide encoding a Protein Disulfide-Isomerase (Pdi1) or a fragment and/or variant thereof which has at least one Pdi functional activity. Also provided herein are genetically modified host cells comprising at least one isolated polynucleotide encoding a Killer Expression protease (Kex2p) or a fragment and/or variant thereof which has at least one Kex2p functional activity, at least one isolated polynucleotide encoding a Protein Disulfide-Isomerase (Pdi1) or a fragment and/or variant thereof which has at least one Pdi1 functional activity and at least one isolated polynucleotide encoding a Endoplasmic Reticulum Oxidoreductin (Ero1) or a fragment and/or variant thereof which has at least one Ero1 functional activity.

The invention relates to the field of biological medicines, and in particular to a rotavirus-encoded small RNA molecule regulating self proliferation. The invention discloses the rotavirus-encoded small RNA molecule regulating self proliferation, wherein the molecule is named RV-vsRNA1775. The small RNA molecule is characterized in that the nucleotide sequence of the small RNA molecule is 5'ATTCAGGATCCTGGAATGGCG3'; the sequence of the RV-VSRNA1775 molecule is located in a 114aa-115aa region of an NSP4 gene, that is, a coiled-coil region. By researching the rotavirus-encoded small RNA, the mutual regulating relationship between the rotavirus and a host cell is further understood, thereby providing a possible path for finding specific drugs for rotavirus injection and providing a theoretical ground for screening drugs taking RV-VSRNA1755 molecule as a rotavirus therapeutic target in the future.

Described herein are novel methods of inserting nucleic acid sequences into host cells. Also described herein are genetically stable host cells comprising inserted nucleic acid sequences and methods of using such host cells in the generation of proteins.

The invention discloses a method for amplifying and activating CIK lymphocyte by using a host cell transfected with functional protein in combination with multiple kinds of protein. The method has the advantages that compared with the prior art, CIK lymphocyte amplified and activated through the method has higher purity, higher amplifying efficiency and higher capability of killing tumor and TAMs in a tumor microenvironment. The method has broad prospects in the aspect of controlling and relieving the progression of part of diseases such as cancer, infectious diseases and diabetes mellitus or the aspects of organ transplantation and hepatitis B.

The invention belongs to the technical field of plant molecular biology, and particularly relates to a rape transcription factor BnWRKY184, a cloning method, a carrier, a host cell and an applicationto preparation of lignin-related transgenic plants. The nucleotide sequence of the rape transcription factor BnWRKY184 is represented as SEQ ID NO.1, the amino acid sequence is represented as SEQ ID NO.2, the length of the nucleotide sequence is 645 bp, and the length of the amino acid sequence is 215 amino acids. The provided rape transcription factor BnWRKY184 has a negative control effect, andcan directly overexpress to inhibit expression of plant lignin and cellulose synthetic genes, so that biosynthesis of lignin and cellulose is blocked, development of sclerenchyma is inhibited, the degree of lignification is reduced, and theoretical basis and related genes are provided for follow-up modification of lignin and cellulose content of rape and seed breeding of rape for vegetables, rapefor feed and rape for green manure.