Peptide name : P8

Source/Organism : Ceropin A-African clawed frog

Linear/Cyclic : Linear

Chirality : L

Peptide length: 20

C-terminal modification: Linear

N-terminal modification : Amidation

Non-natural peptide information: None

Assay type : MTT/MTS assay

Assay time : 72h

Activity : IC50 : 2.6 µM

Cell line : NCI-H69

Cancer type : Lung cancer

Other activity : Hemolytic activity

Amino acid composition bar chart :

Molecular mass : 2431.0605 Dalton

Aliphatic index : 1.025

Instability index : -7.48

Hydrophobicity (GRAVY) : -0.08

Isoelectric point : 10.778

Charge (pH 7) : 6.8403

Aromaticity : 0.2

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

Hydrophobic/hydrophilic ratio : 1.5

hydrophobic moment : -0.759

Missing amino acid : C,R,Q,T,P,M,E,S,D,Y,N,V

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): (0.5, 0.1, 0.4)

SMILES Notation: CC[C@H](C)[C@H](NC(=O)CNC(=O)[C@@H](NC(=O)[C@H](CCCCN)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](Cc1ccccc1)NC(=O)[C@H](CCCCN)NC(=O)[C@H](CCCCN)NC(=O)[C@H](Cc1c[nH]c2ccccc12)NC(=O)[C@@H](N)CCCCN)[C@@H](C)CC)C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N[C@@H](Cc1ccccc1)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](Cc1c[nH]cn1)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](C)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](Cc1ccccc1)C(=O)O

1 : Shin SY, et al. Structure-antitumor and hemolytic activity relationships of synthetic peptides derived from cecropin A-magainin 2 and cecropin A-melittin hybrid peptides. J Pept Res. 1997; 50:279-85. doi: 10.1111/j.1399-3011.1997.tb01469.x

Paper title : Structure-antitumor and hemolytic activity relationships of synthetic peptides derived from cecropin A-magainin 2 and cecropin A-melittin hybrid peptides.

Doi : https://doi.org/10.1111/j.1399-3011.1997.tb01469.x

Abstract : The hybrid peptide (CA-ME) derived from cecropin A(1-8) and melittin (1-12) has potent antibacterial and antimalarial activities. Because the N-terminal sequence 1-12 of magainin 2 is similar to melittin(1-12), CA-MA with CA(1-8) and MA(1-12) and their analogues were designed and synthesized. Antitumor activities of these peptides were evaluated using three small cell lung cancer cell lines. Greater antitumor activity was observed when the residues 16, 18 and 19 of the peptide were hydrophobic (Leu or Val), basic (Lys) and basic (Lys), respectively. The IC50 values of the peptides with the residues were 2 to 4 microM. Residue 12 was related to hemolytic activity rather than antitumor activity. Increase in amphipathicity of P4 enhanced hemolytic activity without significant change in antitumor activity. The alpha-helicity of the peptides in a 30 mM sodium dodecyl sulfate solution was more closely correlated to hemolytic activity than antitumor activity.