Peptide name : PST13-RK

Source/Organism : Derivative of tritrpticin

Linear/Cyclic : Linear

Chirality : L

Peptide length: 13

C-terminal modification: Linear

N-terminal modification : Amidation

Non-natural peptide information: None

Assay type : MTT/MTS assay

Assay time : Not found

Activity : IC50 : 80 µg/ml

Cell line : MDA-MB-361

Cancer type : Breast cancer

Other activity : Anti-microbial activity

Amino acid composition bar chart :

Molecular mass : 1834.2568 Dalton

Aliphatic index : 0

Instability index : 25.0846

Hydrophobicity (GRAVY) : -1.823

Isoelectric point : 10.699

Charge (pH 7) : 5.7541

Aromaticity : 0.384

Molar extinction coefficient (cysteine, cystine): (16500, 16500)

Hydrophobic/hydrophilic ratio : 1.16666666

hydrophobic moment : -0.350

Missing amino acid : T,I,M,E,D,N,G,C,R,H,Q,S,Y,L,A,V

Most occurring amino acid : K

Most occurring amino acid frequency : 6

Least occurring amino acid : F

Least occurring amino acid frequency : 2

Secondary structure fraction (Helix, Turn, Sheet): (0.4, 0.1, 0.3)

SMILES Notation: NCCCC[C@H](NC(=O)[C@H](CCCCN)NC(=O)[C@H](CCCCN)NC(=O)[C@H](Cc1ccccc1)NC(=O)[C@@H]1CCCN1C(=O)[C@H](Cc1c[nH]c2ccccc12)NC(=O)[C@H](Cc1c[nH]c2ccccc12)NC(=O)[C@H](Cc1c[nH]c2ccccc12)NC(=O)[C@@H]1CCCN1C(=O)[C@H](Cc1ccccc1)NC(=O)[C@H](CCCCN)NC(=O)[C@H](CCCCN)NC(=O)[C@@H](N)CCCCN)C(=O)O

1 : Yang ST, et al. Effect of dimerization of a beta-turn antimicrobial peptide, PST13-RK, on antimicrobial activity and mammalian cell toxicity. Biotechnol Lett. 2009; 31:233-7. doi: 10.1007/s10529-008-9848-5

Paper title : Effect of dimerization of a beta-turn antimicrobial peptide, PST13-RK, on antimicrobial activity and mammalian cell toxicity.

Doi : https://doi.org/10.1007/s10529-008-9848-5

Abstract : PST13-RK (KKKFPWWWPFKKK-NH(2)) is an improved derivative of tritrpticin adopting a beta-turn structure. In order to investigate the effect of dimerization of PST13-RK on antimicrobial activity and mammalian cell toxicity, we designed and synthesized its Cys- and Lys-linked dimers. The dimerization of PST13-RK resulted in a 2-4 fold decreased antimicrobial activity against Gram-positive and Gram-negative bacteria. However, the dimers showed a large increase in mammalian cell toxicity against mouse NIH-3T3, human MDA-MB-361, and human A549 cells. These results suggested that PST13-RK is active as a monomer to bacterial cells but as an oligomer to mammalian cells. Since the dimeric PST13-RK is much more effective against the cancer cells than the monomer, it might be an attractive candidate for anticancer chemotherapeutic drugs.