Peptide name : LFB

Source/Organism : The Fujian Large Headed Frog, China, Asia

Linear/Cyclic : Not found

Chirality : Not found

Peptide length: 33

C-terminal modification: Not found

N-terminal modification : Free

Non-natural peptide information: None

Assay type : MTT assay

Assay time : 72h

Activity : IC50 : 18.99 μM

Cell line : MB435

Cancer type : Melanocyte

Other activity : Anti-bacterial activity

Amino acid composition bar chart :

Molecular mass : 3291.9245 Dalton

Aliphatic index : 1.148

Instability index : -5.4455

Hydrophobicity (GRAVY) : 0.4939

Isoelectric point : 9.5954

Charge (pH 7) : 3.7364

Aromaticity : 0.030

Molar extinction coefficient (cysteine, cystine): (0, 125)

Hydrophobic/hydrophilic ratio : 1.75

hydrophobic moment : -0.536

Missing amino acid : R,W,H,T,P,M,E,Y,A

Most occurring amino acid : G

Most occurring amino acid frequency : 7

Least occurring amino acid : F

Least occurring amino acid frequency : 1

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

SMILES Notation: CC[C@H](C)[C@H](NC(=O)[C@H](CCCCN)NC(=O)[C@H](CS)NC(=O)[C@H](CCCCN)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](CCC(N)=O)NC(=O)[C@H](CC(=O)O)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](CO)NC(=O)CNC(=O)[C@H](CO)NC(=O)[C@@H](NC(=O)[C@H](CC(N)=O)NC(=O)[C@H](CCCCN)NC(=O)CNC(=O)[C@@H](NC(=O)CNC(=O)[C@H](CCCCN)NC(=O)[C@H](CC(C)C)NC(=O)[C@@H](NC(=O)CNC(=O)[C@H](CCCCN)NC(=O)[C@@H](NC(=O)[C@@H](NC(=O)[C@H](CO)NC(=O)[C@H](Cc1ccccc1)NC(=O)[C@H](CC(C)C)NC(=O)CN)C(C)C)C(C)C)C(C)C)C(C)C)C(C)C)C(=O)N[C@@H](CO)C(=O)NCC(=O)NCC(=O)N[C@@H](CS)C(=O)O

1 : Li B, et al. LFB: A Novel Antimicrobial Brevinin-Like Peptide from the Skin Secretion of the Fujian Large Headed Frog, Limnonectes fujianensi. Biomolecules. 2019; 9:(unknown pages). doi: 10.3390/biom9060242

Paper title : LFB: A Novel Antimicrobial Brevinin-Like Peptide from the Skin Secretion of the Fujian Large Headed Frog, Limnonectes fujianensi.

Doi : https://doi.org/10.3390/biom9060242

Abstract : Amphibians are a natural source of abundant antimicrobial peptides and thus have been widely investigated for isolation of such biomolecules. Many new antimicrobial peptide families have been discovered from amphibians. In this study, a novel antimicrobial peptide named Limnonectes fujianensis Brevinvin (LFB) has been identified in the skin secretion from the Fujian large headed frog, Limnonectes fujianensis. The cDNA sequence was cloned from a skin secretion library and the predicted mature peptide was identified through MS/MS fragmentation sequencing of reverse phase HPLC fractions on the same sample. LFB was predicted to be an amphipathic, hydrophobic, alpha helical, and beta turn peptide that inserts into a lipid bilayer in order to kill the cells. In antimicrobial assays, a synthetic replicate of this novel antimicrobial peptide demonstrated significant activity against the Gram-positive bacterium Staphylococcus aureus, the Gram-negative bacterium Escherichia coli and the yeast, Candida albicans. This novel peptide was highly potent (MIC 4.88 uM) against Gram-negative bacterium, and also has the ability to inhibit the growth of human cancer cell lines with IC₅₀ values ranging from 18.9 μM down to 2.0 μM. These findings help to enrich our understanding of Brevinin-like peptides. Moreover, the data presented here validate frog secretion as a source of potential novel antimicrobial peptides, that also exhibit anti-tumor properties, that could be useful for the treatment of cancer.