Peptídeos

The coronavirus (CoV) nucleoprotein is the major component of CoV structural proteins. Also known as the nucleocapsid protein, it is an abundant RNA-binding protein critical for viral genome packaging. These factors make nucleoprotein a good target for developing new antiviral drugs. In addition, the identification of epitopes within the nucleoprotein sequence can help design more effective SARS-CoV-2 vaccines.Models have predicted epitopes exhibiting antigenicity, stability and interactions with MHC class-I and class-II molecules. Nucleoprotein (56-70) is an epitope candidate with various HLA restrictions. This epitope can be used to better vaccine design for more durable CD4+ and CD8+ T cell responses for long-lasting immunity.

C-terminal telopeptide is produced when type I collagen in the bone is degraded and so released into the blood. Within collagen structure, made up of a triple helix of 3 amino acid chains, C-telopeptide is located at the C-terminus, and at the N-terminus there is an N-telopeptide. Both the N and the C-telopeptides are involved in the formation of collagen enzymatic cross links which are crucial for Collagen properties in the connective tissues of the body such as the bone and skin. Collagen properties allow connective tissues to be strong, stiff and maintain their structural integrity. Furthermore collagen acts as a scaffold for other extracellular matrix proteins.Due to the presence of C-telopeptide in the blood following the degradation of type 1 collagen, C-telopeptide can be used to monitor the progression of bone diseases where the pathogenesis commonly involves bone degradation.

Fragment 498-514 of the BCL6-interacting co-repressor (BCoR) C-terminally labelled with biotin.

Teduglutide is a GLP-2 analogue, in which the alanine at position 2 has been substituted with glycine making the peptide resistant to degradation by dipeptidyl peptidase-4 (DPP-4)- Teduglutide therefore has a longer half-life than GLP-2 (2-3 hours for teduglutide vs 7 min for GLP-2). Teduglutide has high bioavailability after subcutaneous administration, suggesting that teduglutide has enhanced biological activity, relative to native GLP-2.GLP-2 is a gut hormone produced in the enteroendocrine L cells of gastrointestinal tract by the cleavage of the 160-amino-acid proglucagon molecule. GLP-2 is secreted following the ingestion of food and carries out its activities via the GLP-2 G-protein coupled receptors (GLP-2Rs). GLP-2 has a range of roles within the cell, including: anti-inflammatory effects- promoting the expansion of the intestinal mucosa- stimulating intestinal blood flow- inhibiting gastric acid secretion and gastric emptying- increasing intestinal barrier function and enhancing nutrient and fluid absorption.

Signal transducers and activators of transcription 1 (STAT1) binding peptide. STAT1 is a biotinylated protein that contains an SH2 domain, which binds to specific phospho (pY)-containing peptide motifs. Interferon &γ- (IFN&γ-/type II IFN) activates STAT1 by its phosphorylation. STAT1 is a critical mediator of cytokine signalling and has been reported as a tumour suppressor in breast cancer, myeloma and leukaemia.IFN&γ- is secreted by immune cells and signals through the IFN&γ- receptor and downstream signalling pathways including the janus kinase (JAK)/STAT pathway. IFN&γ- is a central mediator of the adaptive immune system and regulates macrophage activation to promote the expression of high levels of pro-inflammatory cytokines (Il-1β, IL-12, IL-23, and TNF-α)- production of reactive nitrogen and oxygen intermediates- promotion of CD4+ T helper 1 (Th1) cell response and strong inflammatory activity. IFN&γ- inhibits viral replication and is essential for vaccine-mediated immune responses. IFN&γ- signalling is usually short-lived to elicit recovery of homeostasis, including tissue repair, however IFN-&γ- is elevated in severe adult asthma and is present in the airways of children with severe asthma. This indicates a key role for IFN&γ- in inflammatory conditions.Peptide contains a phosphorylated tyrosine residue and an N-terminal 5-carboxyfluorescein (5-FAM), a widely used green fluorescent tag

Peptide H-ALPMHIR^-OH is a Research Peptide with significant interest within the field academic and medical research. This peptide is available for purchase at Cymit Quimica in multiple sizes and with a specification of your choice.

Galanin is widely distributed in the central nervous, peripheral, and endocrine systems. Galanin's overarching function is as an inhibitory, hyper-polarizing neuromodulator for classical neurotransmitters like acetylcholine and serotonin. Galanin interacts with 3 receptor subtypes, GalR1-3 G protein-coupled receptors inserted into the plasma membrane. GalR1 is believed to activate a Gβγ pathway to regulate MAPK activation. GalR2 can also activate the MAPK pathway, but unlike GalR1, there is detectable inositol phosphate production. GalR3 is associated with the Galphai/o pathway. Activation of the receptor leads to a cellular influx of K+. Each receptor has been associated with neurological diseases such as GalR3 and epilepsy.Galanin is a key regulator of growth hormone and insulin release and adrenal secretion however the role galanin plays is not clear. Administration of galanin to animal models leads to inhibition of insulin secretion but this is not replicated in humans.N-terminal galanin fragments naturally occur in vivo, but their relevance is unclear. Some N-terminal fragments reduce metabolic and functional disorders in experimental heart damage. Their relative abundance varies, with fragment (13-20) being one of the lowest quantities detected. The physiological relevance of the galanin fragment (13-20) and its affinity to the various Gal receptors has yet to be made clear. Binding assays and displacement assays in rat brain tissue have been performed with similar N-terminal galanin fragments to try and elucidate their function. Using N-terminal fragments such as galanin (13-20) can help clarify the role of full-length galanin in various roles, such as during myocardial ischemia and reperfusion injury. This may highlight new agonists/antagonists for the galanin GalR receptors that can be therapeutic targets.

The crude venom of the wasp Polybia paulista consists of 30% polybia-MPII. Polybia-MPII is a mastoparan, it is rapidly distributed around the organism point of inoculation via the circulation. As a secretagogue, polybia-MPII has myotoxic action and minor neurotoxic effects. Polybia-MPII has been injected sub-cutaneously and intra-muscularly into mice for pathology and immunohistochemistry assays.As an antimicrobial agent, polybia-MPII is highly effective, with a lower haemolysis rate compared to other mastoparans. Polybia-MPII also shows considerable anti-fungal activity.

SSG-acid tripeptide consists of two serines and one glycine residue, this was synthesised from the dipeptide L-Seryl-L-glycine- the dipeptide SG-acid is also available in our catalogue. SSG-acid has a net charge of 0, it can act as a Bronsted base by accepting a hydron from a donor thus giving it diverse biological and chemical uses.Glycosylated SSG tripeptide was found to act as a competitive ATPase inhibitor produced by the fungal pathogen Mycosphaerella pinodes, named Supprescin A.

Peptide H-GPRP-NH2 is a Research Peptide with significant interest within the field academic and medical research. This peptide is available for purchase at Cymit Quimica in multiple sizes and with a specification of your choice.

Peptide H-GQPLSP^EK^-OH is a Research Peptide with significant interest within the field academic and medical research. This peptide is available for purchase at Cymit Quimica in multiple sizes and with a specification of your choice.

The coronavirus (CoV) nucleoprotein is the major component of CoV structural proteins. The nucleoprotein has a critical role in virus assembly and RNA transcription. The nucleoprotein is essential in the formation of helical ribonucleoproteins and in regulating viral RNA synthesis. The nucleoprotein can also regulate infected host cellular mechanisms. It is highly expressed during infection and may induce protective immune responses against SARS-CoV and SARS-CoV-2.The nucleoprotein residues MSDNGPQNQRNAPRITF (1-17) from SARS-CoV-2 have been identified as a T-cell epitope with a predicted HLA restriction. Immune targeting of confirmed epitopes may potentially offer protection against SARS-CoV-2 and help the development of vaccines for long-lasting immunity.

Peptide Myr-KRMKVAKNAQ-OH is a Research Peptide with significant interest within the field academic and medical research. This peptide is available for purchase at Cymit Quimica in multiple sizes and with a specification of your choice.

Ara h 6 is one of the major allergenic proteins from peanut (Arachis hypogaea) which contains approximately 13 potential allergenic proteins. Ara h 6 is a member of the 2S albumins (conglutinins) belonging to the prolamin superfamily which also includes Ara h 2. 2S albumins contain major food allergens from seeds of many mono- and dicotyledon plants and share a common compact structure that renders the proteins highly resistant to proteolysis.Ara h 6 contains multiple disulphide-bridged cysteine residues, resulting in a tightly coiled, heat-stable, protease resistant core structure that may be important for allergenicity. In mouse models Ara h 2 and Ara h 6 are the main cause of effector responses such as mast cell degranulation and anaphylaxis.This peptide represents a tryptic peptide of Ara h 6. The phenylalanine residue at position 11 of this peptide is isotopically labelled with carbon-13 (9) and nitrogen-15 (1), giving this peptide a mass increase of 10 compared to the unlabelled peptide.

Identification of cell penetrating conjugates has aided numerous areas of scientific development. The Drosophila transcription factor Antennapedia contains a homeodomain that can be internalised by cells to the cytoplasm and to the nucleus in a receptor-independent mechanism. The key residues for internalisation have been sequenced (RQIKIWFQNRRMKWKK), named penetratin, and used in several studies to aid entry of fusion proteins into cells.The full 60 amino acid homeodomain was fused to a T cell epitope of the influenza nucleoprotein and successfully internalised into T cells for presentation. The fragment known as penetratin was fused to a ligand for Grb-2 resulting in inhibition of downstream Grb-2 signalling events. Penetratin has also been used in vivo to prime cytotoxic T lymphocytes by conjugating short antigenic peptides to the CPP. Penetratin is provided here as a C-terminal amide with a C-terminal 5-carboxyfluorescein (5-FAM), a widely used green fluorescent tag often preferred over FITC due to its high stability- absorbance 492 (nm), 518 emission (nm).

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