Peptide name : Cecropin B

Source/Organism : Chinese oak silk moth

Linear/Cyclic : Linear

Chirality : L

Peptide length: 35

C-terminal modification: Linear

N-terminal modification : Amidation

Non-natural peptide information: None

Assay type : Cell viability assay

Assay time : 48h

Activity : IC50 : 61.86 µg/ml

Cell line : 647V

Cancer type : Bladder cancer

Other activity : Not found

Amino acid composition bar chart :

Molecular mass : 3817.6158 Dalton

Aliphatic index : 1.171

Instability index : 22.08

Hydrophobicity (GRAVY) : 0.0029

Isoelectric point : 10.729

Charge (pH 7) : 6.7587

Aromaticity : 0.057

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

Hydrophobic/hydrophilic ratio : 1.69230769

hydrophobic moment : 0.8564

Missing amino acid : C,H,Q,T,M,S,D,Y

Most occurring amino acid : K

Most occurring amino acid frequency : 7

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)CNC(=O)[C@H](CC(N)=O)NC(=O)[C@H](CCCNC(=N)N)NC(=O)[C@@H](NC(=O)[C@H](CC(N)=O)NC(=O)[C@H](CCCNC(=N)N)NC(=O)CNC(=O)[C@@H](NC(=O)[C@H](CCCCN)NC(=O)[C@H](CCC(=O)O)NC(=O)[C@@H](NC(=O)[C@H](CCCCN)NC(=O)[C@H](CCCCN)NC(=O)[C@H](Cc1ccccc1)NC(=O)[C@@H](NC(=O)[C@H](CCCCN)NC(=O)[C@H](Cc1c[nH]c2ccccc12)NC(=O)[C@@H](N)CCCCN)[C@@H](C)CC)[C@@H](C)CC)C(C)C)[C@@H](C)CC)C(=O)N[C@H](C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](C)C(=O)NCC(=O)N1CCC[C@H]1C(=O)N[C@@H](C)C(=O)N[C@H](C(=O)N[C@@H](C)C(=O)N[C@H](C(=O)N[C@@H](CC(C)C)C(=O)NCC(=O)N[C@@H](CCC(=O)O)C(=O)N[C@@H](C)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](C)C(=O)N[C@@H](CC(C)C)C(=O)O)C(C)C)C(C)C)[C@@H](C)CC

1 : Suttmann H, et al. Antimicrobial peptides of the Cecropin-family show potent antitumor activity against bladder cancer cells. BMC Urol. 2008; 8:5. doi: 10.1186/1471-2490-8-5

Paper title : Antimicrobial peptides of the Cecropin-family show potent antitumor activity against bladder cancer cells.

Doi : https://doi.org/10.1186/1471-2490-8-5

Abstract : BACKGROUND: This study evaluated the cytotoxic and antiproliferative efficacy of two well-characterized members of the Cecropin-family of antimicrobial peptides against bladder tumor cells and benign fibroblasts. METHODS: The antiproliferative and cytotoxic potential of the Cecropins A and B was quantified by colorimetric WST-1-, BrdU- and LDH-assays in four bladder cancer cell lines as well as in murine and human fibroblast cell lines. IC50 values were assessed by logarithmic extrapolation, representing the concentration at which cell viability was reduced by 50%. Scanning electron microscopy (SEM) was performed to visualize the morphological changes induced by Cecropin A and B in bladder tumor cells and fibroblasts. RESULTS: Cecropin A and B inhibit bladder cancer cell proliferation and viability in a dose-dependent fashion. The average IC50 values of Cecropin A and B against all bladder cancer cell lines ranged between 73.29 mug/ml and 220.05 mug/ml. In contrast, benign fibroblasts were significantly less or not at all susceptible to Cecropin A and B. Both Cecropins induced an increase in LDH release from bladder tumor cells whereas benign fibroblasts were not affected. SEM demonstrated lethal membrane disruption in bladder cancer cells as opposed to fibroblasts. CONCLUSION: Cecropin A and B exert selective cytotoxic and antiproliferative efficacy in bladder cancer cells while sparing targets of benign murine or human fibroblast origin. Both peptides may offer novel therapeutic strategies for the treatment of bladder cancer with limited cytotoxic effects on benign cells.