Leu-arg

Lys-Arg-Thr-Leu-Arg-Arg (KRTLRR), a hexapeptide substrate for protein kinase C associated with the EGF receptor, facilitates the determination of enzyme activity [1].

N-Myristoyl-Lys-Arg-Thr-Leu-Arg is a protein kinase C (PKC) inhibitor (IC50 = 75 μM) that effectively inhibits IL-2 receptor induction and IL-2 production in the human leukemic cell line Jurkat [1].

Ser-parafluoroPhe-Aad-Leu-Arg-Asn-Pro-NH2 is a biologically active peptide. Structure-activity studies of the thrombin receptor-tethered ligand SFLLRNP highlighted the pivotal role of the Phe-2-phenyl group in receptor recognition, while substitution with para-fluorophenylalanine [(p-F)Phe] increased its activity.

Ac-Leu-Arg-AMC (Acetyl-Leucyl-Arginyl-7-amido-4-methylcoumarin) is a fluorogenic peptide substrate.

Lys-Arg-Thr-Leu-Arg-Arg (KRTLRR) acetate is a hexapeptide. It serves as a substrate for the EGF receptor protein kinase C and is utilized to assess the activity of protein kinase C.

H-Arg-Gly-Tyr-Ala-Leu-Gly-OH is a competitive inhibitor of cAMP-dependent protein kinase [1].

H-Leu-Trp-Met-Arg-OH, a tetrapeptide, serves as a substrate for studies on aminopeptidase-mediated hydrolysis [1].

H-Pro-Thr-Glu-Phe-p-nitro-Phe-Arg-Leu-OH is a water-soluble polypeptide that serves as a substrate for the enzymes cathepsin D, pepsin, and pepsinogen, with potential applications in biochemical analysis [1] [2].

Boc-Leu-Gly-Arg-AMC is a fluorogenic [AMC] substrate employed in enzymatic assays to study convertases.

pGlu-Gln-Arg-Leu-Gly-Asn-Gln-Trp-Ala-Val is a peptides

Acetyl Angiotensinogen (1-14), porcine Acetate is a peptide with the sequence AC-ASP-ARG-VAL-TYR-ILE-HIS-PRO-PHE-HIS-LEU-LEU-VAL-TYR-SER-OH. The protein encoded by the Angiotensinogen gene is known as pre-angiotensinogen or angiotensinogen precursor.

Cadherin Peptide, avian Acetate is a peptide with the sequence Leu-Arg-Ala-His-Ala-Val-Asp-Val-Asn-Gly-NH2. Cadherins are a class of type-1 transmembrane proteins.

Antagonist G is an anticancer peptide and is also a broad spectrum neuropeptide growth factor antagonist.

Levitide is a neurohormone-like peptide which is from the skin of Xenopus laevis.

COG 133 Acetate, (C97H181N37O19) is a peptide with the sequence Ac-Leu-Arg-Val-Arg-Leu-Ala-Ser-His-Leu-Arg-Lys-Leu-Arg-Lys-Arg-Leu-Leu-amide.

Antho-rpamide II is a biologically active neuropeptide isolated from the sea anemone Anthopleura elegantissima.

Pro-Adrenomedullin(153-185),human, (C143H224N42O43), a peptide with the sequence H2N-SLPEAGPGRTLVSSKPQAHGAPAPPSGSAPHFL-OH, MW= 3219.6. Adrenomedullin (AM) is a ubiquitously expressed peptide initially isolated from phaechromyctoma in 19931. AM was initially identified as a vasodilator, some have cited this as the most potent endogenous vasodilatory peptide found in the body2. Differences in opinion regarding the ability of AM to relax vascular tone arises from the differences in the model system used3. Other effects of AM include increasing the tolerance of cells to oxidative stress and hypoxic injury and angiogenesis. AM is seen as a positive influence in diseases such as hypertension, myocardial infarction, chronic obstructive pulmonary disease and other cardiovascular diseases, whereas it can be seen as a negative factor in potentiating the potential of cancerous cells to extend their blood supply and cause cell proliferation.

Boc-LRR-AMC TFA is a fluorescent protease substrate used to detect the trypsin-like activity of the 26S proteasome or 20S proteasome core.

Substance P (alligator), a neuropeptide derived from alligator, possesses a primary structure delineated as Arg-Pro-Arg-Pro-Gln-Gln-Phe-Phe-Gly-Leu-Met-NH2 [1].

The sPLA2-IIA Inhibitor is a cyclic pentapeptide analog of FLSYK, specifically cyclic 2-Nal-Leu-Ser-2-Nal-Arg (c2), which interacts with human IIA phospholipase A2 (hGIIA) to impede its ester bond hydrolyzing function. As part of the esterase superfamily, sPLA2 enzymatically cleaves the sn-2 ester bond in glycerophospholipids, releasing arachidonic acid and lysophospholipids[1].

Kisspeptin-10, a neuropeptide present in the brains, ovaries, and testes of zebrafish, plays a critical role in gonadal development and steroid expression. At a concentration of 10 ng/ml, it enhances the mRNA levels for the luteinizing hormone (Lh) receptor and both progestin receptor a (Pra) and Prb in zebrafish ovarian follicles. In female goldfish, doses of 0.1 and 1 µg/g of Kisspeptin-10 elevate serum levels of luteinizing hormone, with no similar effect observed in male goldfish.

[Leu144,Arg147]-PLP (139-151) is a mutated fragment of the myelin proteolipid protein (PLP), featuring substitutions of tryptophan to leucine and histidine to arginine at positions 144 and 147, respectively. Immunizing mice with this peptide (50 µg) mixed in complete Freund's adjuvant (CFA) elevates IL-4 levels in the spleen. While it suppresses Th1 cell activation in vitro, it does not do so in vivo; instead, it promotes the development of regulatory T cells. Preimmunization with [Leu144, Arg147]-PLP (139-151) postpones the onset of experimental autoimmune encephalomyelitis (EAE) triggered by encephalitogenic peptides from PLP (178-191), myelin oligodendrocyte glycoprotein (MOG) (92-106), or myelin basic protein (MBP) in mice.

EGFR peptide (myristoylated), a synthetic peptide inhibitor of PKC (IC50 = 5 µM), corresponds to the intracellular region's amino acid sequence of EGFR. It effectively reverses doxorubicin resistance in UV-2237M (UV-2237M-ADRR) fibrosarcoma cells at a concentration of 1 µM.

S7, a peptide antagonist of the IL-6 receptor, concentration-dependently inhibits IL-6 binding to its receptor. At 50 µM, S7 suppresses IL-6-triggered elevations in VEGF levels within C-33 A cervical cancer cells and RPMI-8226 B cell lymphocytes. It significantly reduces tumor volume in a C-33 A cervical cancer mouse xenograft model with IL-6 overexpression, following a dosage regimen of 50 mg/kg bi-daily. Moreover, when linked to cysteine on lipid nanoparticles (LNPs) encapsulating doxorubicin, S7 enhances glioma targeting and improves survival rates in a U251 glioblastoma mouse xenograft model.