dbacp04859
General Description
Peptide name : NK-2
Source/Organism : Residue of 39-65 of porcine NK-lysine
Linear/Cyclic : Linear
Chirality : L
Sequence Information
Sequence : KILRGVCKKIMRTFLRRISKDILTGKK
Peptide length: 27
C-terminal modification: Linear
N-terminal modification : Amidation
Non-natural peptide information: None
Activity Information
Assay type : MTT/MTS assay
Assay time : 4h
Activity : IC50 : 4.3±0.3 µM
Cell line : E42/02
Cancer type : Skin cancer
Other activity : Hemolytic activity
Physicochemical Properties
Amino acid composition bar chart :
Molecular mass : 3203.0139 Dalton
Aliphatic index : 1.118
Instability index : 45.4333
Hydrophobicity (GRAVY) : -0.263
Isoelectric point : 11.604
Charge (pH 7) : 8.7453
Aromaticity : 0.037
Molar extinction coefficient (cysteine, cystine): (0, 0)
Hydrophobic/hydrophilic ratio : 0.92857142
hydrophobic moment : -0.777
Missing amino acid : W,H,Q,P,E,Y,N,A
Most occurring amino acid : K
Most occurring amino acid frequency : 6
Least occurring amino acid : V
Least occurring amino acid frequency : 1
Structural Information
3D structure :
Secondary structure fraction (Helix, Turn, Sheet): (0.3, 0.1, 0.4)
SMILES Notation: CC[C@H](C)[C@H](NC(=O)[C@H](CCCNC(=N)N)NC(=O)[C@H](CCCNC(=N)N)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](Cc1ccccc1)NC(=O)[C@@H](NC(=O)[C@H](CCCNC(=N)N)NC(=O)[C@H](CCSC)NC(=O)[C@@H](NC(=O)[C@H](CCCCN)NC(=O)[C@H](CCCCN)NC(=O)[C@H](CS)NC(=O)[C@@H](NC(=O)CNC(=O)[C@H](CCCNC(=N)N)NC(=O)[C@H](CC(C)C)NC(=O)[C@@H](NC(=O)[C@@H](N)CCCCN)[C@@H](C)CC)C(C)C)[C@@H](C)CC)[C@@H](C)O)C(=O)N[C@@H](CO)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(=O)O)C(=O)N[C@H](C(=O)N[C@@H](CC(C)C)C(=O)N[C@H](C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCCN)C(=O)O)[C@@H](C)O)[C@@H](C)CC
Secondary Structure :
| Method | Prediction |
|---|---|
| GOR | HHHHHHHHHHHHHHHHHHHTHHHHTCC |
| Chou-Fasman (CF) | CEEEEHHHHEEEECEEECCCEEECCCC |
| Neural Network (NN) | HHHHHHHHHHHHHHHCCCCCCCCCCCC |
| Joint/Consensus | HHHHHHHHHHHHHHHCCCCCCCCCCCC |
Molecular Descriptors and ADMET Properties
Molecular Descriptors: Click here to download
ADMET Properties: Click here to download
Cross Referencing databases
Reference
1 : Gross S, et al. Design of NK-2-derived peptides with improved activity against equine sarcoid cells. J Pept Sci. 2013; 19:619-28. doi: 10.1002/psc.2540
Literature
Paper title : Design of NK-2-derived peptides with improved activity against equine sarcoid cells.
Doi : https://doi.org/10.1002/psc.2540
Abstract : Equine sarcoid is a topically accessible model for the evaluation of anticancer peptides acting by physical membrane disruption avoiding the complexity of a systemic application. We aim at evaluating and improving natural peptides for host defence as lead structures, where we focus on the cationic and amphipathic peptide NK-2. Cytotoxicity tests, fluorescence microscopy and a chip-based biosensor, which enabled real-time monitoring of cell metabolism, were applied. Cancer cell killing was dynamic with an initial phase of increased cellular respiration, followed by membrane destruction. NK-2 was substantially improved and shortened. Novel peptides exhibited a fivefold improved activity against sarcoid cells, while haemolysis remained almost unaltered. Similar Zeta potential and similar amount of surface phosphatidylserine of sarcoid and normal skin cells are responsible for a lack of selectivity between these two cell types.