Peptide name : Polybia-MPI

Source/Organism : Social wasp

Linear/Cyclic : Not found

Chirality : L

Peptide length: 14

C-terminal modification: Not found

N-terminal modification : Free

Non-natural peptide information: None

Assay type : Not specified

Assay time : Not found

Activity : Not found

Cell line : Not found

Cancer type : Breast cancer

Other activity : Anti-microbial activity

Amino acid composition bar chart :

Molecular mass : 1654.9899 Dalton

Aliphatic index : 1.535

Instability index : 33.8643

Hydrophobicity (GRAVY) : 0.0643

Isoelectric point : 8.4975

Charge (pH 7) : 0.7593

Aromaticity : 0.071

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

Hydrophobic/hydrophilic ratio : 1.33333333

hydrophobic moment : -1.264

Missing amino acid : C,R,H,T,P,M,E,F,S,Y,N,V,G

Most occurring amino acid : K

Most occurring amino acid frequency : 3

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](N)C(=O)N[C@@H](CC(=O)O)C(=O)N[C@@H](Cc1c[nH]c2ccccc12)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CC(=O)O)C(=O)N[C@@H](C)C(=O)N[C@@H](C)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@H](C(=O)N[C@@H](CC(C)C)C(=O)O)[C@@H](C)CC

1 : Souza BM, et al. Structural and functional characterization of two novel peptide toxins isolated from the venom of the social wasp Polybia paulista. Peptides. 2005; 26:2157-64. doi: 10.1016/j.peptides.2005.04.026

Paper title : Structural and functional characterization of two novel peptide toxins isolated from the venom of the social wasp Polybia paulista.

Doi : https://doi.org/10.1016/j.peptides.2005.04.026

Abstract : Two novel inflammatory peptides were isolated from the venom of the social wasp Polybia paulista. They had their molecular masses determined by ESI-MS and their primary sequences were elucidated by Edman degradation chemistry as: Polybia-MPI: I D W K K L L D A A K Q I L-NH2 (1654.09 Da), Polybia-CP: I L G T I L G L L K S L-NH2 (1239.73 Da). Both peptides were functionally characterized by using Wistar rat cells. Polybia-MPI is a mast cell lytic peptide, which causes no hemolysis to rat erythrocytes and presents chemotaxis for polymorphonucleated leukocytes (PMNL) and with potent antimicrobial action both against Gram-positive and Gram-negative bacteria. Polybia-CP was characterized as a chemotactic peptide for PMNL cells, presenting antimicrobial action against Gram-positive bacteria, but causing no hemolysis to rat erythrocytes and no mast cell degranulation activity at physiological concentrations.