73 results about "Self-assembling peptide" patented technology

The invention relates to the technical field of molecular biology and protein engineering, in particular to a lactic acid bacteria antibacterial peptide LABA4 multi-copy expression method and application. The invention aims to provide a prokaryotic expression method of an antibacterial peptide LAB4 tandem gene based on a self-assembled peptide and application, so that the problems of toxicity to a host, low expression quantity and non-ideal product activity in a large intestine expression system are solved, the antibacterial peptide is efficiently expressed in escherichia coli, and the antibacterial activity is effectively improved. Particularly, the characteristics of specific cutting and no amino acid residue of enterokinase are utilized, modified recombinant enterokinase is added between LAB4 monomers to serve as an interval restriction enzyme cutting site, a gene shuffling technology is utilized to design and construct three-six copy tandem recombinant plasmids of LAB4, the self-cleavage characteristic of intein is utilized, and the recombinant enterokinase recombinant plasmids of LAB4 can be used for preparing the recombinant enterokinase recombinant plasmids of LAB4, so that the recombinant enterokinase recombinant plasmids of LAB4 can be used for preparing the recombinant enterokinase recombinant plasmids of LAB4. An optimized cspA cold shock promoter in a pCold I vector is adopted, and high-efficiency expression of tandem LAB4 in an escherichia coli expression system is realized through 15 DEG C low-temperature induction precise regulation and control.

The invention relates to an SR-B1 targeted polypeptide compound and application thereof in preparation of antitumor drugs, and belongs to the technical field of biological drug manufacturing. In order to solve the problems that the existing PDT photosensitizer is insufficient in targeting property and the treatment effect is limited due to the action of intracellular cholesterol, the invention provides an SR-B1 targeting polypeptide compound which is composed of an SR-B1 targeting polypeptide and an AS1411 aptamer. The SR-B1 targeting polypeptide comprises an SR-B1 targeting peptide fragment, a self-assembly peptide fragment, a response enzyme digestion peptide fragment and a photosensitizer TCPP which are connected in sequence. The invention constructs a polypeptide targeting system based on a dual self-assembly strategy, which not only can target SR-B1, inhibit a cholesterol-mediated tumor for a long time to promote a signal channel and interfere the ROS steady state, but also can target TCPP to a cell nucleus, improve the photosensitivity of PDT, and further improve the killing effect on tumor cells by improving the yield of ROS to cause the damage to the cell nucleus.

The invention relates to an SR-B1 targeted polypeptide compound and application thereof in preparation of antitumor drugs and immunotherapy sensitizers, and belongs to the technical field of biological drug manufacturing. In order to solve the problems that an existing PD-L1 inhibitor is single in action mechanism and immune system dysfunction is easily caused, the invention provides an SR-B1 targeted polypeptide compound which is composed of SR-B1 targeted polypeptide and Resiquimod. The SR-B1 targeting polypeptide comprises an SR-B1 targeting peptide fragment, a self-assembly peptide fragment and a hydrophobic molecule which are connected in sequence. The SR-B1 targeting polypeptide can recognize overexpressed SR-B1 in tumor cells, block cholesterol uptake, inhibit tumor progression and inhibit expression of PD-L1 at the same time. The polypeptide compound accurately delivers Resiquimod to a tumor site, anti-tumor immune response is activated, and sensitivity of tumor immunotherapy is greatly enhanced through combination of cholesterol metabolism regulation and immunotherapy.

Embodiments are directed to a UPEC conjugate peptide including a self-assembling peptide and at least one UPEC epitope. The UPEC conjugate peptide may self-assemble into a nanofiber or fibril. Compositions including the UPEC conjugate peptide may be used to treat a bacterial infection such as a urinary tract infection (UTI). The compositions and methods may be specific for pathogenic bacteria. The compositions and methods may treat the infection without altering the gut microbiome.

The application discloses a kind of β-hairpin structure self-assembly capture antibacterial peptide J-1-RF and its application, it is related to biological medicine technical field.The amino acid sequence of the β-hairpin structure self-assembly capture antibacterial peptide J-1-RF is as shown in SEQ ID NO.4.The application selects the broad-spectrum antibacterial short peptide J-1 derived from honeybee royal jelly as template peptide, designs and transforms according to the amino acid sequence characteristics of short peptide J-1, obtains hydrophilic and hydrophobic amino acid alternately arranged structure unit, and uses it as self-assembly peptide fiber skeleton. D PG and RRRF two turning sequences are used for β-hairpin peptide design, so that it has the dual effect of antibacterial and bacterial capture.The β-hairpin structure self-assembly capture antibacterial peptide J-1-RF provided by the application can form fiber network structure, has good bacteriostatic effect and high stability, and has excellent biocompatibility, which provides effective technical support for developing new antibacterial drugs.

The present application relates to a kind of water gel support prepared by self-assembled polypeptide and the use of support obtained therefrom, the preparation method includes: 1) self-assembled peptide sequence is linked nerve growth factor analog peptide by covalent bond to obtain bonded functional polypeptide;2) macrophage is separated and cultured, and is induced to be " alternative activation " anti-inflammatory M2 macrophage, obtain culture supernatant and carry out filtration, obtain filtered cell culture supernatant;3) filtered cell culture supernatant is mixed with bonded functional polypeptide, obtain mixed solution and adjust the concentration of the mixed solution, the bonded functional polypeptide self-assembles and forms water gel support.The present application uses M2 macrophage condition culture supernatant to construct regenerative microenvironment, combines polypeptide functional water gel support, realizes better overall interaction, and prepares the water gel support that can supplement and regulate nerve regeneration, the support can promote nerve cell regeneration behavior, provides new selection for tissue engineering biomaterials.

The present invention provides a material or method that can replace conventional materials and methods for preventing digestive fluid leakage. The digestive fluid leakage preventing material of the present invention comprises a self-assembling peptide gel, has an adhesion retention rate of at least 40% on a collagen sheet, and a decomposition rate of 35% or less based on pancreatic juice treatment at 37°C for 7 days.

The invention relates to a polypeptide for targeted destruction of lipid droplets and application of the polypeptide in preparation of antitumor drugs, and belongs to the technical field of biological drug manufacturing. In order to solve the problem that an existing anti-tumor drug aiming at tumor lipid droplets cannot effectively inhibit immune escape of tumor cells while destroying the lipid droplets, the invention provides a polypeptide for targeted destruction of the lipid droplets, and the polypeptide comprises a PLIN2 targeted peptide fragment, a self-assembly peptide fragment, an enzyme response peptide fragment and an HLA-E targeted peptide fragment which are connected in sequence. On the basis of a double-targeting strategy, the polypeptide for targeted destruction of the lipid droplets is constructed, and the polypeptide can target the PLIN2 protein on the surfaces of the lipid droplets; the self-assembled peptide fragment can form a nanofiber structure on the surface of the lipid droplet, the structure and function of the lipid droplet are destroyed, endoplasmic reticulum stress is caused, and tumor cell immunogenicity death is caused. The HLA-E targeting peptide fragment released by polypeptide digestion can specifically target HLA-E on a tumor cell membrane, block an NKG2A-HLA-E pathway, and effectively inhibit immune escape of tumor cells.

[Problem] The present invention provides a hemostatic composition and a hemostatic method using the hemostatic composition, and specifically provides a composition for hemostasis that can be uniformly applied to a bleeding site and exert a high hemostatic effect. [Solution] A composition to be applied as a spray to a subject is provided, wherein the composition is characterized in that the spray is for hemostasis, and the composition comprises a self-assembling peptide that gels due to self-assembly when the composition is applied to a bleeding site of the subject, and the self-assembling peptide is contained in the composition at a concentration with an improved hemostatic ability compared to direct application.

The present disclosure describes a peptide scaffold for producing vaccines. The peptide scaffold includes a peptide that self-assembles into a hapten carrier (hC) includes amphipathic alpha-helices. The peptide includes heptad repeats following a specific pattern. The hC further includes hapten or an agent conjugated to it, and optionally the hC includes one or more T-cell epitopes at the N- and / or C-terminus of the one or more amphipathic alpha-helices. The present disclosure also describes compositions including immunogenic compositions including the hapten-hC or agent-hC conjugate.

Compositions containing self-assembling peptides and / or self-assembling peptidomimetics (“self-assembling peptides”) can be used to create a long-lasting “lift” or means of elevating tissue to be resected, dissected, manipulated or repaired, as a bulking agent, or as a tissue forming matrix by injection of a solution that forms a solid gel in situ, which is stable for a prolonged period of time from days to a month, is hemostatic, and may prevent adhesions. These self-assembling peptides and methods of use thereof enable better separation of tissues and visualization of margins, more durable and robust lifts, less need for frequent injections that carry risk of undesired perforation, and simultaneous management of adverse effects, such as bleeding, leaking, inflammation and iatrogenic injury during endoscopic, laparoscopic or other minimally invasive, or open surgical procedures in and / or on the body.

The present invention provides a self-assembling peptide gel for use in preventing a leak of digestive fluid and a self-assembling peptide gel for use in protecting an organ against digestion by a digestive fluid. The self-assembling peptide gel comprises a self-assembling peptide and water, whereby the self-assembling peptide gel has an adhesion persistence ratio with respect to a collagen sheet of at least 40% and a decomposition ratio of 35% or less in pancreatic juice treatment at 37°C for 7 days, and the self-assembling peptide gel is positively charged as a whole.

Disclosed herein is a versatile injectable nano-bioactive scaffold designed to achieve both immediate soft tissue volumization and long-term tissue regeneration. By utilizing biocompatible polymers such as hyaluronic acid, chitosan, and alginate, along with self-assembling peptides and nano-structured carriers including mesoporous silica nanoparticles and liposomes, the system facilitates controlled release of essential growth factors. This innovative approach delivers sustained bioactivity, significantly reducing the need for repeated injections and minimizing inflammatory complications. The system promises superior clinical outcomes, advancing the field of tissue engineering and regenerative medicine by providing an effective and lasting solution for tissue repair and regeneration.

The invention discloses self-assembled super-elastic protein, hydrogel and application of the self-assembled super-elastic protein and the hydrogel, and belongs to the technical field of biology. The self-assembled super-elastic protein provided by the invention comprises a self-assembled peptide SUP35, a human-derived elastin and a human-derived adhesive peptide, the amino acid sequence of the self-assembling peptide SUP35 is as shown in SEQ ID NO. 3; the amino acid sequence of the human elastin is as shown in SEQ ID NO. 4; the sequence of the human-derived adhesion peptide is VAPG; the number of the human-derived elastin is one or more. The self-assembled super-elastic protein is obtained by fermenting and purifying by taking microorganisms as a chassis, and a series of problems caused by source problems are reduced. Meanwhile, the super-elastic protein can be self-assembled to form a multi-stage structure, has remarkable functions of high temperature resistance, cell proliferation, cell migration and cell repair, and has remarkable antioxidant capacity and excellent in-vitro adhesion effect.

Compounds comprising a benzaldehyde acetal acid-degradable amphiphilic lipid and self-assembling peptides are incorporated in lipid nanoparticle (LNP) and used to transfect cells.

A nanoagonist, and a preparation method and use thereof are provided, belonging to the technical field of nanoscale biomedicine. The nanoagonist is formed by self-assembly of a transformable peptide, where the transformable peptide includes a targeted antimicrobial peptide, a functionalized self-assembling peptide, an FcγR recognition peptide, and a lipase-responsive hydrophobic molecule that are coupled in sequence. The functionalized self-assembling peptide can control the FcγR recognition peptide to flip toward a surface of a target pathogen during secondary self-assembly, and the target pathogen is a pathogen targeted and bound by the targeted antimicrobial peptide. The nanoagonist combines externalization of the FcγR recognition peptide that can be guided during the secondary self-assembly with FcγR-mediated endocytosis, and a nanoagonist is developed for the first time that takes into account both pathogen clearance and host immune function repair.

The invention discloses an antibacterial peptide J-R-pG and application thereof in preparation of an antibacterial agent, and relates to the technical field of biological medicines. The amino acid sequence of the antibacterial peptide J-R-pG is as shown in SEQ ID NO. 5. A broad-spectrum antibacterial short peptide Jelleine-1 (J-1) from bee royal jelly is selected as a template peptide, design and transformation are performed according to amino acid sequence characteristics of the short peptide J-1, and a hydrophilic and hydrophobic amino acid alternate arrangement structural unit is obtained and serves as a self-assembly peptide fiber skeleton. Beta-hairpin peptide design is carried out by adopting two turning sequences of DPG and RRRF, so that the beta-hairpin peptide has dual effects of resisting bacteria and capturing bacteria. The antibacterial peptide J-R-pG provided by the invention can form a fiber network structure, has a good antibacterial effect, high stability and excellent biocompatibility, and provides an effective technical support for developing novel antibacterial drugs.

Described herein are self-assembled peptides and hydrogels comprising self-assembled peptides and glucose. Exemplary hydrogels comprising self-assembled peptides and glucose may be used to encapsulate glucagon and / or a glucagon analogue. Hydrogels with glucagon and / or a glucagon analogue encapsulated therein may be used to treat hypoglycemia and related disorders in subjects in need thereof.

The invention relates to the technical field of stem cells, in particular to a preparation method of neural stem cells, which is characterized by comprising the following steps: separating cells from a nervous tissue sample examined and approved by ethics; mixing the separated cells with the magnetic nanoparticles modified by the specific antibody; separating and recovering the target neural stem cells under the action of a low-gradient magnetic field; inoculating the recovered neural stem cells into a self-assembled peptide hydrogel culture system for in-vitro amplification; performing cryopreservation on the amplified neural stem cells, and performing standardized quality detection; the membrane integrity and surface marker expression of the neural stem cells are maintained through combination of low-concentration enzyme digestion and mild mechanical oscillation, the recovery rate and purity of the cells are remarkably improved by adopting the antibody-modified magnetic nanoparticles and a low-gradient magnetic field sorting technology, the in-vivo microenvironment is simulated by using the self-assembled peptide hydrogel, and the in-vivo microenvironment of the neural stem cells is simulated by using the self-assembled peptide hydrogel. The amplification and differentiation potential of the cells is promoted, so that the preparation efficiency and stability of the neural stem cells are improved.

The invention relates to a self-assembling peptide, a hydrogel formed by the self-assembling peptide, and an application of the hydrogel.

The present invention relates to a liquid, positively charged, responsive self- assembling peptide, a liquid scaffold material formed from the self-assembling peptide, and applications of the liquid scaffold material.

The present disclosure describes peptide nanosponges comprising a plurality of self-assembled peptide building blocks. The plurality of self-assembled peptide building blocks comprises a first peptide building block comprising: a branched polymeric core comprising at least three arms; a first block co-peptide covalently linked to one of said arms, wherein said first block co-peptide comprises a first peptide block and a second peptide block which is different from the first peptide block; a lipid-based capping moiety covalently attached to the first block co-peptide; and a therapeutically active compound covalently attached via a cleavable linkage to the first block co-peptide. Advantageously, the block co-peptide is covalently attached to the core such that it is resistant to enzymatic cleavage from the core.

According to the echinococcus granulosus vaccine based on the self-assembly peptide, a peptide fragment, rich in dominant epitopes, in EgG1Y162-2 is connected to a Q11 amino terminal through '-SGSG-', due to the self-assembly effect of the Q11 peptide, the peptide fragment rich in dominant epitopes is repeatedly expressed on the surface of nanofibers, and therefore EgG1Y162 dominant multi-epitope self-assembly nano-polypeptide is formed; the EgG1Y162 dominant multi-epitope self-assembled nano polypeptide is adopted in the vaccine, so that the immune recognition and response of a body are effectively enhanced.

Compositions containing self-assembling peptides and / or self-assembling peptidomimetics (“self-assembling peptides”) can be used to create a long-lasting “lift” or means of elevating tissue to be resected, dissected, manipulated or repaired, as a bulking agent, or as a tissue forming matrix by injection of a solution that forms a solid gel in situ, which is stable for a prolonged period of time from days to a month, is hemostatic, and may prevent adhesions. These self-assembling peptides and methods of use thereof enable better separation of tissues and visualization of margins, more durable and robust lifts, less need for frequent injections that carry risk of undesired perforation, and simultaneous management of adverse effects, such as bleeding, leaking, inflammation and iatrogenic injury during endoscopic, laparoscopic or other minimally invasive, or open surgical procedures in and / or on the body.

The present invention provides a protein-responsive hydrogel and a method for preparing the same. The hydrogel comprises a nanofiber three-dimensional network structure formed by protein-induced self-assembly of a polypeptide or its derivative solution, and can be used for three-dimensional culture in vitro. It is useful for tissue repair, wound dressings, hemostatic materials, dispersion and in-tissue molding materials containing regenerative microspheres such as L-polylactic acid and polycaprolactone for cosmetic and medical use, carriers for the sustained release of drugs or functional factors, and cell preservation materials.

The bioink comprises a cell solution containing live cells and a cell culture medium, and a self-assembling peptide solution containing a self-assembling peptide. The bioink is formed by mixing and extruding both the cell solution and the self-assembling peptide solution, and after mixing, the bioink can be continuously extruded from a mixer. Also disclosed is a useful method for producing the bioink. It is apparent to those skilled in the art that the present invention brings about an important advancement in the technology of bioink.

An object is to provide a peptide gelling agent which gels under physiological conditions and which has a relatively short chain length, and a sustained-release gel based on the gelling agent. A hydrogelling self-assembling peptide is provided having one or two core peptides with an amino acid sequence of the formula: Xaa-Yaa-Zaa-Yaa-Xaa-Yaa-Zaa-Yaa-Xaa, wherein Xaa is independently Ile or Met, Yaa is independently Asp, Glu, Lys, or Arg, and Zaa is independently Ala or Gly. The full length of the amino acid sequence constituting the self-assembling peptide is 25 amino acids or less.

The application discloses a kind of peptide micropipe / In2O3 / Au composite gas-sensitive materials, its preparation method and application, belong to gas-sensitive material technical field.The material is self-assembled peptide micropipe (SPMFs) as three-dimensional support skeleton, by solution mixing and functional modification, make In2O3 nanoparticle uniform dispersion, Au nanoparticle surface load, form ternary composite system.SPMFs porous structure provides stable load platform for nanoparticle and accelerates gas diffusion, the LSPR effect of Au nanoparticle can enhance visible light absorption and surface reactivity, the heterojunction formed by In2O3 and SPMFs regulates electron transport.Under the synergistic effect of the three, material can detect ethanol at room temperature under visible light excitation, with high selectivity, high sensitivity and fast adsorption and desorption characteristics, detection lower limit is as low as 1 ppm, meet the demand of trace ethanol real-time monitoring.

There is provided a bioabsorbable peptide tissue occluding agent that can be applied to large mammals including humans, the peptide tissue occluding agent being obtained by artificial synthesis to avoid concerns of infection by viruses and the like.The tissue occluding agent contains a peptide, wherein the peptide is an amphiphilic peptide having 8-200 amino acid residues with the hydrophilic amino acids and hydrophobic amino acids alternately bonded, and is a self-assembling peptide exhibiting a β-structure in aqueous solution in the presence of physiological pH and / or a cation.

The disclosure provides slow-release formulations of Glucagon-like peptide- 1 receptor agonist (GLP-1 RA), such as for example, semaglutide, tirzepatide, and survodutide, for treating obesity, type II diabetes and other metabolic disorders. The formulations are based on self- assembling peptides compositions, such as, for example, RADA16 and IEIK13.