Peptide name : P2

Source/Organism : Plant sources

Linear/Cyclic : Linear

Chirality : L

Peptide length: 8

C-terminal modification: Linear

N-terminal modification : Not found

Non-natural peptide information: None

Assay type : MTS assay

Assay time : 48h

Activity : IC50 : 700 μg/Ml

Cell line : Raji

Cancer type : Not specified

Other activity : Not found

Amino acid composition bar chart :

Molecular mass : 905.0755 Dalton

Aliphatic index : 1.1

Instability index : 89

Hydrophobicity (GRAVY) : 0.6625

Isoelectric point : 8.2497

Charge (pH 7) : 0.7502

Aromaticity : 0.125

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

Hydrophobic/hydrophilic ratio : 3

hydrophobic moment : -0.792

Missing amino acid : H,Q,T,P,M,I,E,K,F,D,Y,N,V

Most occurring amino acid : L

Most occurring amino acid frequency : 2

Least occurring amino acid : R

Least occurring amino acid frequency : 1

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

SMILES Notation: CC(C)C[C@H](NC(=O)[C@H](CS)NC(=O)[C@H](CO)NC(=O)[C@H](Cc1c[nH]c2ccccc12)NC(=O)CNC(=O)[C@H](CC(C)C)NC(=O)[C@H](C)NC(=O)[C@@H](N)CCCNC(=N)N)C(=O)O

1 : Ju X, et al. Antimicrobial Peptide Brevinin-1RL1 from Frog Skin Secretion Induces Apoptosis and Necrosis of Tumor Cells. Molecules. 2021; 26:(unknown pages). doi: 10.3390/molecules26072059

Paper title : Antimicrobial Peptide Brevinin-1RL1 from Frog Skin Secretion Induces Apoptosis and Necrosis of Tumor Cells.

Doi : https://doi.org/10.3390/molecules26072059

Abstract : Cancer has always been one of the most common malignant diseases in the world. Therefore, there is an urgent need to find potent agents with selective antitumor activity against cancer cells. It has been reported that antimicrobial peptides (AMPs) can selectively target tumor cells. In this study, we focused on the anti-tumor activity and mechanism of Brevinin-1RL1, a cationic α-helical AMP isolated from frog Rana limnocharis skin secretions. We found that Brevinin-1RL1 preferentially inhibits tumor cells rather than non-tumor cells with slight hemolytic activity. Cell viability assay demonstrated the intermolecular disulfide bridge contributes to the inhibitory activity of the peptide as the antitumor activity was abolished when the disulfide bridge reduced. Further mechanism studies revealed that both necrosis and apoptosis are involved in Brevinin-1RL1 mediated tumor cells death. Moreover, Brevinin-1RL1 induced extrinsic and mitochondria intrinsic apoptosis is caspases dependent, as the pan-caspase inhibitor z-VAD-FMK rescued Brevinin-1RL1 induced tumor cell proliferative inhibition. Immunohistology staining showed Brevinin-1RL1 mainly aggregated on the surface of the tumor cells. These results together suggested that Brevinin-1RL1 preferentially converges on the cancer cells to trigger necrosis and caspase-dependent apoptosis and Brevinin-1RL1 could be considered as a pharmacological candidate for further development as anti-cancer agent.