Peptide name : Magainin B

Source/Organism : African clawed frog

Linear/Cyclic : Linear

Chirality : L

Peptide length: 23

C-terminal modification: Linear

N-terminal modification : Amidation

Non-natural peptide information: None

Assay type : Trypan blue assay

Assay time : 72h

Activity : IC50 : 30 µg/ml

Cell line : MLA

Cancer type : Leukemia cancer

Other activity : Anti-microbial activity

Amino acid composition bar chart :

Molecular mass : 2478.951 Dalton

Aliphatic index : 0.852

Instability index : 10.5565

Hydrophobicity (GRAVY) : 0.387

Isoelectric point : 10.001

Charge (pH 7) : 2.8461

Aromaticity : 0.130

Molar extinction coefficient (cysteine, cystine): (0, 0)

Hydrophobic/hydrophilic ratio : 1.875

hydrophobic moment : -0.082

Missing amino acid : C,R,W,Q,T,P,D,Y

Most occurring amino acid : A

Most occurring amino acid frequency : 5

Least occurring amino acid : L

Least occurring amino acid frequency : 1

Secondary structure fraction (Helix, Turn, Sheet): (0.5, 0.1, 0.3)

SMILES Notation: CC[C@H](C)[C@H](NC(=O)CN)C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N[C@@H](Cc1ccccc1)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](Cc1c[nH]cn1)C(=O)N[C@@H](C)C(=O)N[C@@H](C)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](Cc1ccccc1)C(=O)N[C@@H](C)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](C)C(=O)N[C@@H](Cc1ccccc1)C(=O)N[C@H](C(=O)N[C@@H](C)C(=O)N[C@@H](CCC(=O)O)C(=O)N[C@H](C(=O)N[C@@H](CCSC)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CO)C(=O)O)[C@@H](C)CC)C(C)C

1 : Huang CM, et al. Magainin analogs effective against pathogenic protozoa. Antimicrob Agents Chemother. 1990; 34:1824-6. doi: 10.1128/AAC.34.9.1824

2 : Cruciani RA, et al. Antibiotic magainins exert cytolytic activity against transformed cell lines through channel formation. Proc Natl Acad Sci U S A. 1991; 88:3792-6. doi: 10.1073/pnas.88.9.3792

Paper title : Magainin analogs effective against pathogenic protozoa.

Doi : https://doi.org/10.1128/AAC.34.9.1824

Abstract : The in vitro activities of magainin analogs against Blastocystis hominis, Entamoeba histolytica, and Trypanosoma cruzi were assessed by protozoan morphological integrity and motility. The antiprotozoan activities in descending order were magainin B greater than G greater than H, the same order as the alpha-helix contents of the analogs. Magainin B and G were effective against B. hominis, T. cruzi, and E. histolytica.

Paper title : Antibiotic magainins exert cytolytic activity against transformed cell lines through channel formation.

Doi : https://doi.org/10.1073/pnas.88.9.3792

Abstract : Magainins are an ionophoric class of vertebrate peptides with antibiotic activity against various microorganisms. Here we show that magainin 2 and synthetic analogues can rapidly and irreversibly lyse hematopoietic tumor and solid tumor target cells with a relative cytotoxic potency that parallels their antibacterial efficacy and at concentrations that are relatively nontoxic to well-differentiated cells. The cytotoxicity is prevented by cell depolarization. Magainins represent a natural cytolytic agent in vertebrates and may provide another therapeutic strategy for certain tumors.