Peptide name : Temporin-PE

Source/Organism : Pelophylax kl. esculentus

Linear/Cyclic : Linear

Chirality : L

Peptide length: 13

C-terminal modification: Linear

N-terminal modification : Amidation

Non-natural peptide information:

Assay type : MTT assay

Assay time : Not Available

Activity : IC50 = 25.13 μM

Cell line : U251-MG

Cancer type : Brain Tumor

Other activity : Antimicrobial and Anticancer

Amino acid composition bar chart :

Molecular mass : 1383.7597 Dalton

Aliphatic index : 2.1

Instability index : 10.9846

Hydrophobicity (GRAVY) : 1.9692

Isoelectric point : 8.7501

Charge (pH 7) : 0.7591

Aromaticity : 7.692

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

Hydrophobic/hydrophilic ratio : 5.5

hydrophobic moment : 1.2549

Missing amino acid : C,D,E,H,M,N,Q,R,T,W,Y

Most occurring amino acid : L

Most occurring amino acid frequency : 5

Least occurring amino acid : F

Least occurring amino acid frequency : 1

Secondary structure fraction (Helix, Turn, Sheet): (53., 23., 61.)

SMILES Notation: CC[C@H](C)[C@H](NC(=O)[C@@H]1CCCN1C(=O)[C@H](CC(C)C)NC(=O)[C@@H](N)Cc1ccccc1)C(=O)N[C@H](C(=O)N[C@@H](C)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CO)C(=O)NCC(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CC(C)C)C(=O)O)C(C)C

1 : Sang M, et al. Identification and target-modifications of temporin-PE: A novel antimicrobial peptide in the defensive skin secretions of the edible frog, Pelophylax kl. esculentus. Biochem Biophys Res Commun. 2018; 495:2539-2546. doi: 10.1016/j.bbrc.2017.11.173

Paper title : Identification and target-modifications of temporin-PE: A novel antimicrobial peptide in the defensive skin secretions of the edible frog, Pelophylax kl. esculentus.

Doi : https://doi.org/10.1016/j.bbrc.2017.11.173

Abstract : A potent natural antimicrobial peptide named temporin-PE was identified and encoded from the skin secretions of Pelophylax kl. esculentus via "shotgun" cloning and LC-MS/MS fragmentation analysis. Target-modifications were carried out to further enhance the antimicrobial and anti-proliferative bioactivities, whilst decreasing the hemolytic effect. A range of bioassays demonstrated that replacing a proline with a tyrosine residue resulted in a loss of the bioactivity against Gram-negative bacteria, but dramatically improved the hemolytic and anti-proliferative activity, indicating the FLP- motif influences the hemolytic activity of temporins. Moreover, the coupling of TAT to the peptide dramatically improved its antimicrobial activity, indicating coupling TAT to these peptides could be considered as a potential tool to improve their antimicrobial activity. Overall, we have shown that targeted modifications of this natural antimicrobial peptide can adjust its bioactivities to help its development as an antibiotic or anti-proliferative agent.