Peptide name : Vaby A

Source/Organism : African, the Ethiopian highlands

Linear/Cyclic : Not found

Chirality : L

Peptide length: 29

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 : Fibrosarcoma

Other activity : Not found

Amino acid composition bar chart :

Molecular mass : 2888.2839 Dalton

Aliphatic index : 0.403

Instability index : 45.4759

Hydrophobicity (GRAVY) : 0.0759

Isoelectric point : 5.9623

Charge (pH 7) : -0.2965

Aromaticity : 0.034

Molar extinction coefficient (cysteine, cystine): (5500, 5875)

Hydrophobic/hydrophilic ratio : 1.9

hydrophobic moment : 0.1834

Missing amino acid : H,Q,M,K,F,D,Y

Most occurring amino acid : C

Most occurring amino acid frequency : 6

Least occurring amino acid : L

Least occurring amino acid frequency : 1

Secondary structure fraction (Helix, Turn, Sheet): (0.1, 0.4, 0.2)

SMILES Notation: CC[C@H](C)[C@H](NC(=O)[C@@H]1CCCN1C(=O)[C@H](Cc1c[nH]c2ccccc12)NC(=O)[C@H](CO)NC(=O)[C@H](CS)NC(=O)[C@H](CO)NC(=O)[C@H](CS)NC(=O)CNC(=O)[C@@H]1CCCN1C(=O)[C@@H](NC(=O)[C@H](CC(N)=O)NC(=O)[C@H](CS)NC(=O)[C@@H](NC(=O)CNC(=O)CNC(=O)[C@H](C)NC(=O)[C@H](CS)NC(=O)[C@@H](NC(=O)[C@H](CCC(=O)O)NC(=O)CNC(=O)[C@H](CS)NC(=O)[C@@H](NC(=O)[C@@H]1CCCN1C(=O)[C@H](CC(C)C)NC(=O)CN)C(C)C)[C@@H](C)O)[C@@H](C)O)[C@@H](C)O)C(=O)N[C@@H](CS)C(=O)N[C@H](C(=O)N[C@@H](CCCNC(=N)N)C(=O)N[C@@H](CC(N)=O)C(=O)O)[C@@H](C)O

1 : Yeshak MY, et al. Cyclotides from an extreme habitat: characterization of cyclic peptides from Viola abyssinica of the Ethiopian highlands. J Nat Prod. 2011; 74:727-31. doi: 10.1021/np100790f

Paper title : Cyclotides from an extreme habitat: characterization of cyclic peptides from Viola abyssinica of the Ethiopian highlands.

Doi : https://doi.org/10.1021/np100790f

Abstract : As part of ongoing explorations of the structural diversity of cyclotides, the cyclotide content of a native violet of the East African highlands, Viola abyssinica (which grows at altitudes up to 3400 m), was studied. Six new cyclotides, vaby A-E (1-5) and varv E (6), were isolated and characterized by employing HPLC and MS techniques and quantitative amino acid analysis. Cyclotides 1-5 were found to have new sequences, and 1-3 have a further novel feature in their sequences, an alanine moiety in loop 2. Two of the cyclotides (1 and 4) also exhibited cytotoxic properties in a flourometric microculture cytotoxicity assay. The findings corroborate the hypothesis that investigating the cyclotide contents of violets growing in diverse environments is a promising approach for extending our knowledge of both the structural and biological diversity of cyclotides.