helix

Phe-Met-Arg-Phe-like peptide, derived from the visceral and somatic muscles of the snail Helix aspersa, is a neuropeptide known as FMRF (Phe-Met-Arg-Phe). This peptide comprises four amino acid residues[1].

PTBP1-RNA-binding inhibitor P6 TFA (PTBP1 α3-helix derived peptide P6 TFA) is a specific stapled peptide inhibitor of the splicing factor PTBP1, which is used to inhibit RNA alternative splicing events regulated by PTBP1. PTBP1-RNA-binding inhibitor P6 TFA exerts its effects by binding to the RNA recognition motif of PTBP1.

S1H, a synthetic peptide mimetic of human growth hormone amino acids 36-51, acts as an antagonist to the growth hormone receptor. It forms an α-helical structure in solution and inhibits STAT5 phosphorylation triggered by human growth hormone in SK-MEL-28 and MALME-3M melanoma cell lines, as well as prolactin in IM-9 B cell lymphocytes, at concentrations of 100 and 200 nM.

Thioether-cyclized helix B peptide (CHBP) enhances metabolic stability and exerts renoprotective effects by promoting autophagy through the inhibition of mTOR C1 and activation of mTOR C2 [1].

Thioether-cyclized helix B peptide, CHBP (TFA), is the trifluoroacetic (TFA) salt of CHBP, enhancing metabolic stability and exhibiting renoprotective effects by promoting autophagy through inhibition of mTOR C1 and activation of mTOR C2 [1].

PTBP1α3-helix derived peptide P1 is a polypeptide that inhibits RNA binding [1].

Phe-Met-Arg-Phe Like Peptide acetate (Pqdpflrfamide acetate) is a FMRF-like peptide from visceral and somatic muscles of the snail Helix aspersa. FMRF (Phe-Met-Arg-Phe) is a neuropeptide peptide consisting of 4 amino acid residues.

C-MYC PEPTIDE EPITOPE TFA, the product of the c-myc proto-oncogene, is a helix-loop-helix leucine zipper phosphoprotein that regulates gene transcription in cell proliferation, cell differentiation and apoptosis. This peptide is a human c-myc epitope.

LAH4 TFA, an alpha-helix of the designed amphipathic peptide antibiotic, exhibits potent antimicrobial, nucleic acid transfection, and cell penetration capabilities, along with high plasmid DNA delivery capacities, and shows a strong affinity for anionic lipids in bacterial outer membranes [1] [2] [3].

NTR 368 TFA, a peptide derived from the p75 neurotrophin receptor (p75NTR) and corresponding to residues 368-381 of the human receptor, exhibits a helix-forming propensity in the presence of micellar lipid. It is a potent inducer of neural apoptosis [1].

QEQLERALNSS TFA, a helix B surface peptide (HBSP) derived from erythropoietin, exhibits tissue protective activities. It notably safeguards cardiomyocytes against apoptosis [1].

GVLSNVIGYLKKLGTGALNAVLKQ (PGQ) is a 24-amino acid antimicrobial peptide capable of forming an α-helix structure. It exhibits activity against both Gram-negative and Gram-positive bacteria, as well as the yeast Candida albicans [1].

C34 peptide, also referred to as HR2, is a biologically active peptide integral to the helical region of HIV's gp41 and is specifically the C-terminal heptad repeat 2 (HR2), denoted as the C helix or C peptide. It functions as a potent inhibitor of HIV-1 fusion, thereby impeding the virus's entry into cells via membrane fusion.

st-Ht31, a cell-permeable stearated peptide derived from the amphipathic helix domain of A-kinase anchoring proteins (AKAPs), effectively binds protein kinase A (PKA), impacting PKA's cellular interactions without altering its activity. Specifically, at a 50 µM concentration, it reduces PKA's membrane anchoring in BHK-21 fibroblast reporter assays. Moreover, st-Ht31 at concentrations of 1 and 3 µM decreases both capacitance and hyperactivation in mouse sperm, thereby inhibiting in vitro fertilization. Additionally, at 50 µM, this compound facilitates cholesterol export in BHK-21 cells and RAW 264.7 macrophages expressing ATP-binding cassette transporter 1 (ABCA1), showcasing its multifaceted cellular impacts.

BLP-3, an endogenous peptide derived from X. laevis skin, exhibits antibacterial efficacy against N. meningitidis, N. gonorrhoeae, N. lactamica, and N. cinerea at a concentration of 20 µg/ml. Characterized by its ability to fold into an alpha-helix, BLP-3 penetrates and disrupts bacteriomimetic membranes, underlying its mechanism of action.

β-CGRP, human ,a 37-amino acid peptide,is the beta form of Calcitonin-gene-related peptide (β-CGRP), involved extensively in regulation of the cardiovascular and nervous systems. β-CGRP contains a disulphide bridge at the N-terminus, a C-terminal phenylal

This amino acids187 to 203 fragment is derived from the C-terminal helix of synaptosomal-associated protein of 25 kDa (SNAP-25). This peptide is able to rescue exocytosis from botulinum neurotoxin E (BoNT/E)-treated cells, albeit at higher concentrations

The a-helix of the amphipathic peptide antibiotic LAH4 (KKALLALALHHLAHLALHLALALKKA-NH2) strongly interacts with phospholipid membranes, demonstrating in vitro transfection efficiencies comparable to those of commercially available reagents.

Type II collagen is composed of a triple helix of three identical α chains. These molecules associate to form a fibril that is stabilized by intermolecular crosslinks1. Damage to the fibrillar meshwork, made up of primarily type II collagen (z 90–95%), ma

Peptide 399 is an antimicrobial peptide with an idealized amphiphilic alpha helix.

N36Mut(e,g) is an HIV fusion peptide inhibitor targeting gp41. It functions by disrupting the formation of the homotrimeric coiled coil of the N-terminal helix in the pre-hairpin intermediate, leading to the creation of a heterotrimer.

GCO-(GPO)10-GCOG is a polypeptide containing GPO repeat sequences, exhibiting a collagen-like single collagen triple-helix structure. The cross-linked triple-helix GCO-(GPO)10-GCOG can form collagen-related peptide (CRP) mimetics that closely bind Yersinia adhesin YadA. YadA mediates the adhesion of the human intestinal pathogen Yersinia enterocolitica to collagen and other extracellular matrix components, potentially disrupting host processes mediated by endogenous collagen-binding proteins. GCO-(GPO)10-GCOG is useful for studying YadA-related infections.

EK1 is a peptide-based coronavirus (CoV) fusion inhibitor that exhibits broad-spectrum inhibitory activity against various coronaviruses. EK1 demonstrates significantly enhanced pan-coronavirus fusion inhibitory activity and effectively suppresses SARS-CoV-2. It can form a stable six-helix bundle (6HB) structure with short α-hCoV and long β-hCoV N-terminal heptad repeat sequences.

Vm24-toxin (Vaejovis mexicanus peptide 24) TFA is a peptide composed of 36 amino acids, known for effectively and selectively blocking Kv1.3 channels, exhibiting an affinity (Kd) of approximately 3 pM in lymphocytes. It demonstrates over 1500 times greater affinity for Kv1.3 compared to other tested potassium channels. The structure of Vm24-toxin TFA includes a twisted cystine-stabilized α/β motif, comprising a single-turn α-helix and a three-stranded antiparallel β-sheet, stabilized by four disulfide bridges. Additionally, Vm24-toxin TFA can attenuate the response of CD4+ effector memory T cells to T-cell receptor (TCR) stimulation.