225 results about "Intracellular protein" patented technology

This invention is directed to a method for preparation of a biological sample for measurement of protein epitopes that allows for the preservation of intracellular protein epitopes and detection of signal transduction pathways based on the ability to capture transient activation states of the epitopes. The method provided by the invention allows for the rapid fixation of biological samples containing red blood cells, to ensure that epitopes of signal transduction molecules and other intracellular protein epitopes are preserved in the active state. The method of the invention further allows for lysis of red blood cells, thereby making it a useful method for cytometric analysis of biological samples, including, for example, whole blood, bone marrow aspirates, peritoneal fluids, and other red blood cell containing samples. The invention also provides a method to recover or “unmask” epitopes on intracellular antigens that have been made inaccessible by the cross linking fixative necessary to fix the sample. Significantly, the methods of the invention allow preservation and analysis of phospho-epitope levels in biological samples taken directly from patients to determine disease-specific characteristics.

Disclosed is a system for detecting a protease inside a cell. In one embodiment, the system includes a chimeric protein that comprises as covalently linked components: 1) at least one optionally masked signal protein; 2) at least one protease-specific cleavage site; and 3) at least one detectable amino acid sequence. The invention has a wide spectrum of applications including use in the detection of novel protease inhibitors inside cells and tissue.

The present invention relates to compositions and methods for intracellular protein delivery. The compositions include a protein operatively associated with a cationic lipid in such a way as to facilitate intracellular delivery of the protein by the cationic lipid, such as by associating directly with a cationic lipid, encapsulating it in a cationic liposome, associating the protein with a lipoplex comprising cationic lipid and nucleic acid, or associating the protein with an anionic polymer that is in association with a cationic lipid. These compositions are useful in delivering antibodies to intracellular proteins to neutralize their activity, and to introduce therapeutically useful proteins, peptides or small molecules.

pH-Responsive polymer-based protein delivery carriers and compositions, methods for making the carriers and compositions, and methods for using the carriers and compositions for intracellular protein antigen delivery, inducing a cytotoxic T-lymphocyte response, introducing a tumor-specific protein antigen to an antigen presenting cell to induce an immune response, and providing tumor protection to a subject.

DNA constructs and genetically engineered microbial strains constructed using these DNA constructs, which produce a nuclease enzyme with specificity for DNA and / or RNA, are provided. These strains secrete nuclease into the periplasm or growth medium in an amount effective to enhance productivity and / or recovery of polymer, and are particularly suited for use in high cell density fermentation processes. These constructs are useful for modifying microbial strains to improve production and recovery processes for polymers such as intracellular proteins, such as enzymes, growth factors, and cytokines; for producing polyhydroxyalkanoates; and for producing extracellular polysaccharides, such as xanthan gum, alginates, gellan gum, zooglan, hyaluronic acid and microbial cellulose.

The invention provides methods and compositions for localized delivery of a vector comprising a therapeutic agent to a specific region of the brain associated with a neurodegenerative diseases that is characterized by an excess buildup of buildup of intracellular protein aggregates. In particular, the invention provides methods and compositions used to deliver an adeno-associated virus vector (AAV) comprising a nucleotide sequence encoding an inhibitor of apoptosis protein (IAP) to cells in the region.

The invention relates to an analytical method for researching protein structure or protein-protein interaction. The method comprises the following steps: performing crosslinking and enzymolysis on a protein composite in a cell by using a crosslinking agent with reactive groups on two sides and a breakable group, and taking a part of the enzymatic hydrolysate for a derivatization reaction for mass spectrometry; after breaking the crosslinking agent by means of a chemical method for the other part of the enzymatic hydrolysate, enriching peptide sections with an enriching material, and performing mass spectrometry on the enzymatic hydrolysate without the enriched peptide sections; determining the crosslinked peptide sections according to a library searching result so as to establish a peptide section library; finding out a candidate peptide section from the peptide section library according to N-terminal amino acid information of the crosslinked peptide section determined in the mass spectrogram of the crosslinked peptide section; and determining the crosslinked peptide section sequence by combining the mass spectrogram m / z of the crosslinked peptide section and the characteristic ions of the peptide section so as to obtain the protein structure and protein-protein interaction information. The method has the advantage of being simple to operate, and is applied to structural analysis of proteins and analysis of protein-protein composite interaction.

The invention relates to protein-protein interactions and methods for identifying interacting proteins and the amino acid sequence at the site of interaction. Using overlapping hexapeptides that encode for the entire amino acid sequences of the linker domains of human P-glycoprotein gene 1 and 3 (HP-gp1 and HP-gp3), a direct and specific binding between HP-gp1 and 3 linker domains and intracellular proteins was demonstrated. Three different stretches (617EKGIYFKLVTM627, (SEQ ID NO: 1) 658SRSSLIRKRSTRRSVRGSQA677 (SEQ ID NO: 2) and 694PVSFWRIMKLNLT706 (SEQ ID NO: 3) for HP-gp1 and 618LMKKEGVYFKLVNM631 (SEQ ID NO: 4), 648KAATRMAPNGWKSRLFRHSTQKNLKNS674 (SEQ ID NO: 5), and 695PVSFLKVLKLNKT707 (SEQ ID NO: 6) for HP-gp3) in linker domains bound to proteins with apparent molecular masses of ˜80 kDa, 57 kDa and 30 kDa. The binding of the 57 kDa protein was further characterized. Purification and partial N-terminal amino acid sequencing of the 57 kDa protein showed that it encodes the N-terminal amino acids of alpha and beta-tubulins. The method of the present invention was further validated with Annexin. The present invention thus demonstrates a novel concept whereby the interactions between two proteins are mediated by strings of few amino acids with high and repulsive binding energies, enabling the identification of high affinity binding sites between any interacting proteins.

The invention provides a microfluidic chip and a single cell protein quantitative detection device and method. The chip is composed of a PDMS (Polydimethylsiloxane) layer and a quartz layer; a microfluidic chip technology is combined with a liquid drop formation technology, a fluorescence antibody preparation technology and a fluorescence detection technology and then high-throughput quantitative detection of proteins in single cells is realized; reliable device and method are provided for characterization of cell biological characteristics. By designing and manufacturing a fluorescence antibody pair and setting an optical filter, the detection precision can be effectively improved and detection errors are reduced. Equipment including an inverted fluorescent microscope, a photomultiplier and the like can be used in a traditional biological laboratory, so that the device and the method have strong adaptability and high portability and are convenient to realize.

A method for modulating at least one pharmacokinetic property of a protease inhibitor upon administration to a host is provided. One administers to the host an effective amount of a bifunctional compound of less than about 5000 daltons comprising the protease inhibitor or an active derivative thereof and a pharmacokinetic modulating moiety. The pharmacokinetic modulating moiety binds to at least one intracellular protein. The bifunctional compound has at least one modulated pharmacokinetic property upon administration to the host as compared to a free drug control that comprises the protease inhibitor.

Methods and compositions for the rapid and reversible destabilizing of specific proteins in vivo using cell-permeable, synthetic molecules are described.

The present invention relates to compositions and methods for intracellular protein delivery. The compositions include a protein operatively associated with a cationic lipid in such a way as to facilitate intracellular delivery of the protein by the cationic lipid, such as by associating directly with a cationic lipid, encapsulating it in a cationic liposome, associating the protein with a lipoplex comprising cationic lipid and nucleic acid, or associating the protein with an anionic polymer that is in association with a cationic lipid. These compositions are useful in delivering antibodies to intracellular proteins to neutralize their activity, and to introduce therapeutically useful proteins, peptides or small molecules.

A cell permeabilization and stabilization reagent and method of use are disclosed. The reagent contains a N-acyl sarcosine or a salt thereof, a pH adjusting agent to adjust pH of the reagent in a range from about 4 to about 6; and an aqueous medium; the reagent having a low ionic strength defined by a conductivity of less than 9.0 mS / cm. The reagent further contains bovine serum albumin and glycerol. The reagent may further include an alkyl sulfate surfactant. Upon incubating the cells with the reagent, the reagent permeates the cellular membrane to allow penetration of an intracellular marker, causes intracellular protein aggregation within the cellular membrane, while preserves a cellular constituent for binding with a cellular marker for subsequent analysis by flow cytometry.

Methods and compositions are provided for analyzing intracellular events employing fusion proteins comprising the small beta-galactosidase fragment fused to a protein of interest or fragment thereof. By expressing the fusion protein in a cellular host, one can determine the effect of various agents on the activity of the fusion protein, adding the large beta-galactosidase fragment to the fusion protein, either intracellularly or in a lysate and determining the activity of the formed beta-galactosidase using a substrate that forms a detectable product. In this manner, degradation, complex formation, RNAi inhibition or other situation that affects beta-galactosidase activity can be determined.

The invention provides a fluorescent probe for intracellular protein labelling as well as a synthesis method and an application of the fluorescent probe. The provided probe is synthesized in simple steps and has good light stability. Compared with existing fluorescent probes for cell labeling, the probe can be specifically bound with SNAP labels in a complicated system and label any protein in cells. The probe can be applied to detection of copper ions in the cells, fluorescence gradually disappears with increase of the concentration of the copper ions, and the copper ion detection function isrealized. The probe realizes labeling of any protein and detection of the copper ions in the complicated environment and has very important application value in the biological and medical fields.

The invention discloses a method of using phospholipase C to extracellularly express intracellular protein and belongs to the technical field of bioengineering. Through co-expression phospholipase C, intracellular positioning protein is released to the outsides of cells by means of nonspecific leaking, and high-performance phospholipase C and co-expression recombinant bacteria high in target protein extracellular enzyme activity are obtained by screening. Enzyme activity of recombinant bacteria extracellular sucrose phosporylase co-expressing sucrose phosphorylase and phospholipase C is 1445.1U mL-1, and enzyme activity of recombinant bacteria extracellular trehalase co-expressing trehalase and phospholipase C is 322.3U mL-1. The method can realize extracellular expression of intracellular positioning protein, improve production efficiency and simplify post-extraction process, has wide application value in food, cosmetics and pharmaceuticals industry and has great demand in market at home and abroad.

The present invention provides Janus kinase inhibitors, such as compounds of Formula (I) and Formula (II) wherein RY1 and RY2 comprise a tagged hydrophobic moiety RH. The compounds may covalently or non-covalently bind a kinase (e.g., Janus kinase 3 (JAK3)). The hydrophobic moiety RH may signal to the intracellular protein homeostasis machinery to induce degradation of the targeted kinase. Also provided are pharmaceutical compositions, kits, methods, and uses that involve the compounds for reducing the activity of a kinase and / or treating and / or preventing a condition associated with aberrant activity of a kinase (e.g., a proliferative disease, inflammatory disorder, autoimmune disorder, painful condition, and / or viral infection).

In one aspect, the present disclosure relates to methods for detecting an activity of an enzyme in a cell. In some embodiments, the methods include contacting a cell with a liposome containing at least one substrate thereby facilitating introduction of the substrate into the cell. The substrate is capable of producing a detectable light signal when acted on by the enzyme, and the signal is detected. The methods can be used in screening agents that can inhibit or activate an enzyme activity. The methods can also be used in various downstream assays such the detection of interactions between intracellular proteins, screening for variants of an enzyme, and detection of various diseases. Compositions and kits for carrying out the various methods are also provided.

A reference control for cell by cell analysis on flow cytometric analyzers contains cellular analogs made of permeated blood cells containing therein aggregated intracellular proteins and preserved antigenic sites thereof, having cellular membrane permeable to antibodies and a suspension medium. The reference control is frozen after being prepared and thawed prior to use. The cellular analogs further contain a fluorescence marker therein. Further disclosed are a method of making the reference control and a method using the reference control, as an internal or stand-alone control, for measurements of cellular hemoglobin and cellular hemoglobin variant of a blood sample.

The invention discloses an analysis method of microalgae proteome. The analysis method comprises the steps of collecting microalgae cells; extracting intracellular protein; and identifying the differentially expressed proteins. The inventtion provides an approach for analyzing microalgae proteome. The approach involves cell collection, protein extraction and protein analysis, thereby obtaining protein qualitative and quantitative results of microalgae under different cultivation conditions, so as to provide the analysis method of microalgae proteome. The method has significance for promoting microalgae proteome research.

This invention is directed to a method for preparation of a biological sample for measurement of protein epitopes that allows for the preservation of intracellular protein epitopes and detection of signal transduction pathways based on the ability to capture transient activation states of the epitopes. The method provided by the invention allows for the rapid fixation of biological samples containing red blood cells, to ensure that epitopes of signal transduction molecules and other intracellular protein epitopes are preserved in the active state. The method of the invention further allows for lysis of red blood cells, thereby making it a useful method for cytometric analysis of biological samples, including, for example, whole blood, bone marrow aspirates, peritoneal fluids, and other red blood cell containing samples. The invention also provides a method to recover or ''unmask'' epitopes on intracellular antigens that have been made inaccessible by the cross linking fixative necessary to fix the sample. Significantly, the methods of the invention allow preservation and analysis of phospho-epitope levels in biological samples taken directly from patients to determine disease-specific characteristics.

Disclosed are methods of removing oil from an aqueous surface, comprising: surrounding an oil spot on the aqueous surface with an oil-absorbing material; and introducing a solution comprising a surfactant to the oil spot. Also disclosed are the above methods where the oil is not mechanically directed towards the oil-absorbing material, or where the oil-absorbing material is not mechanically directed towards the oil. Also disclosed are the above methods further comprising introducing a solution comprising a protein / surfactant complex to the oil spot, where the protein / surfactant complex comprises a protein component obtained from the fermentation of yeast, comprising a mixture of multiple intracellular proteins, at least a portion of the mixture including yeast polypeptides obtained from fermenting yeast and yeast stress proteins resulting from subjecting a mixture obtained from the yeast fermentation to stress.

The invention is directed to the use of (i) a first antigen corresponding to a target antigen of interest, together with (ii) a second antigen, corresponding to a modified form of the target antigen, whose rate of intracellular proteolytic degradation is increased, enhanced or otherwise elevated relative to the first antigen, in compositions and methods for inducing both humoral and cellular immunity in an individual. The ability to provide compositions, which are capable of inducing both host-protective antibody and cell-mediated immune responses, facilitates the generation of immunogenic compositions capable of combating, inter alia, conditions that have long latency periods and, therefore, benefit from the dual approach of prophylaxis and therapy in one delivery.

The invention provides a high-efficiency soil protein extraction method, comprising the following steps: adding soil in a pre-cooling soil protein extraction buffer solution and blending and oscillating the mixture in a 4 DEG C shaking table over night; performing drawing and filtering of the shaken mixture in a buchner funnel using a crude filter paper; processing the drawing and filtering liquid by macroporous resin (D101), filtering the processed liquid through a 0.22 Mum microporous membrane, the filtered liquid being the extracellular protein mother liquid; processing the cells on the filter membrane by cleaning, crushing, centrifugalizing and vacuum drying to obtain the dried powder, namely intracellular soil protein sediment. The extracellular protein mother liquid is processed by centrifuging, separating and vacuum drying to obtain the intracellular soil protein dried powder; degrading the intracellular soil protein dried powder until the degraded intracellular soil protein dried powder is clearly separated on 10% polyacrylamide gel SDS-PAG electrophoresis, the method has high separation efficiency, microbial yield is 37.5%, which is higher than the yield of the traditional method 0.1-1%, simple operation flow, good SDS-PAGE resolution and good mass spectrum identification effect.