Peptide name : Dermaseptin-PT9

Source/Organism : Skin secretion, Brownbelly leaf frog, Purchased in Peru, South America

Linear/Cyclic : Not found

Chirality : Not found

Peptide length: 25

C-terminal modification: Not found

N-terminal modification : Amidation

Non-natural peptide information: None

Assay type : MTT assay, Lactate dehydrogenase (LDH) assay

Assay time : 24h

Activity : IC50 : 8.64 - 18.51 μM

Cell line : MCF-7

Cancer type : Breast cancer

Other activity : Anti-microbial activity; Hemolytic activity

Amino acid composition bar chart :

Molecular mass : 2606.0476 Dalton

Aliphatic index : 0.9

Instability index : 8.884

Hydrophobicity (GRAVY) : 0.18

Isoelectric point : 9.5282

Charge (pH 7) : 1.76

Aromaticity : 0.08

Molar extinction coefficient (cysteine, cystine): (5500, 5500)

Hydrophobic/hydrophilic ratio : 1.77777777

hydrophobic moment : -1.162

Missing amino acid : C,R,H,Q,P,Y

Most occurring amino acid : A

Most occurring amino acid frequency : 5

Least occurring amino acid : W

Least occurring amino acid frequency : 1

Secondary structure fraction (Helix, Turn, Sheet): (0.5, 0.2, 0.3)

SMILES Notation: CC[C@H](C)[C@H](NC(=O)[C@H](CCCCN)NC(=O)[C@H](CO)NC(=O)[C@H](Cc1c[nH]c2ccccc12)NC(=O)[C@H](CC(C)C)NC(=O)CN)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(=O)O)C(=O)N[C@@H](C)C(=O)N[C@@H](C)C(=O)N[C@@H](CCCCN)C(=O)N[C@H](C(=O)N[C@@H](C)C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N[C@@H](C)C(=O)N[C@@H](C)C(=O)N[C@@H](CC(C)C)C(=O)NCC(=O)N[C@@H](Cc1ccccc1)C(=O)N[C@H](C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CCC(=O)O)C(=O)N[C@@H](CCSC)C(=O)N[C@H](C(=O)O)C(C)C)C(C)C)[C@@H](C)O

1 : Li M, et al. A Novel Dermaseptin Isolated from the Skin Secretion of Phyllomedusa tarsius and Its Cationicity-Enhanced Analogue Exhibiting Effective Antimicrobial and Anti-Proliferative Activities. Biomolecules. 2019; 9:(unknown pages). doi: 10.3390/biom9100628

Paper title : A Novel Dermaseptin Isolated from the Skin Secretion of Phyllomedusa tarsius and Its Cationicity-Enhanced Analogue Exhibiting Effective Antimicrobial and Anti-Proliferative Activities.

Doi : https://doi.org/10.3390/biom9100628

Abstract : A novel dermaseptin peptide, dermaseptin-PT9 (DPT9), was isolated and identified from Phyllomedusa tarsius by the combination of molecular cloning and LC-MS analysis. Chemically synthesised DPT9 was broadly effective against the tested microorganisms through the disruption of cell membranes and showed weak haemolytic activity towards horse erythrocytes. It also exhibited anti-proliferative effect against various human cancer cells. Moreover, an analogue with enhanced cationicity, K8, 23-DPT9, in which Asp8 and Glu23 were substituted by lysine residues, had a markedly increased antimicrobial effect against all tested microorganisms and disrupted microbial cell membranes. This analogue also showed no haemolysis at its effective antimicrobial concentrations. In addition, K8, 23-DPT9 displayed an enhanced anti-proliferative effect against cancer cells, while displayed weak activity against the normal human cell line, HMEC-1.