Peptide name : Dermaseptin-PS3

Source/Organism : Skin, the waxy monkey tree frog, South America

Linear/Cyclic : Not found

Chirality : Not found

Peptide length: 23

C-terminal modification: Not found

N-terminal modification : Carboxyl-terminal amide formation

Non-natural peptide information: None

Assay type : MTT assay

Assay time : Not found

Activity : IC50 : 15.67 μM

Cell line : H157

Cancer type : Lung cancer

Other activity : Anti-microbial activity

Amino acid composition bar chart :

Molecular mass : 2550.9492 Dalton

Aliphatic index : 1.317

Instability index : 22.2565

Hydrophobicity (GRAVY) : -0.052

Isoelectric point : 8.5411

Charge (pH 7) : 0.7968

Aromaticity : 0.043

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

Hydrophobic/hydrophilic ratio : 1.3

hydrophobic moment : -1.048

Missing amino acid : C,R,H,T,P,M,F,S,Y

Most occurring amino acid : A

Most occurring amino acid frequency : 4

Least occurring amino acid : W

Least occurring amino acid frequency : 1

Secondary structure fraction (Helix, Turn, Sheet): (0.4, 0.2, 0.3)

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

1 : Tan Y, et al. Biological Activities of Cationicity-Enhanced and Hydrophobicity-Optimized Analogues of an Antimicrobial Peptide, Dermaseptin-PS3, from the Skin Secretion of Phyllomedusa sauvagii. Toxins (Basel). 2018; 10:(unknown pages). doi: 10.3390/toxins10080320

Paper title : Biological Activities of Cationicity-Enhanced and Hydrophobicity-Optimized Analogues of an Antimicrobial Peptide, Dermaseptin-PS3, from the Skin Secretion of Phyllomedusa sauvagii.

Doi : https://doi.org/10.3390/toxins10080320

Abstract : The skin secretions of the subfamily Phyllomedusinae have long been known to contain a number of compounds with antimicrobial potential. Herein, a biosynthetic dermaseptin-precursor cDNA was obtained from a Phyllomedusa sauvagii skin secretion-derived cDNA library, and thereafter, the presence of the mature peptide, namely dermaseptin-PS3 (DPS3), was confirmed by LC⁻MS/MS. Moreover, this naturally occurring peptide was utilized to design two analogues, K5, 17-DPS3 (introducing two lysine residues at positions 5 and 17 to replace acidic amino acids) and L10, 11-DPS3 (replacing two neutral amino acids with the hydrophobic amino acid, leucine), improving its cationicity on the polar/unipolar face and hydrophobicity in a highly conserved sequence motif, respectively. The results in regard to the two analogues show that either increasing cationicity, or hydrophobicity, enhance the antimicrobial activity. Also, the latter analogue had an enhanced anticancer activity, with pretreatment of H157 cells with 1 µM L10, 11-DPS3 decreasing viability by approximately 78%, even though this concentration of peptide exhibited no haemolytic effect. However, it must be noted that in comparison to the initial peptide, both analogues demonstrate higher membrane-rupturing capacity towards mammalian red blood cells.