Peptide name : CecropinXJ

Source/Organism : Larvae, Domestic silk moth

Linear/Cyclic : Linear or ring-shaped

Chirality : Not found

Peptide length: 37

C-terminal modification: Linear or ring-shaped

N-terminal modification : Not found

Non-natural peptide information: None

Assay type : Not specified

Assay time : Not found

Activity : Not found

Cell line : Not found

Cancer type : Not found

Other activity : Anti-microbial activity

Amino acid composition bar chart :

Molecular mass : 4079.902 Dalton

Aliphatic index : 1.002

Instability index : 61.8757

Hydrophobicity (GRAVY) : -0.243

Isoelectric point : 10.708

Charge (pH 7) : 6.7598

Aromaticity : 0.054

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

Hydrophobic/hydrophilic ratio : 1.46666666

hydrophobic moment : 0.6094

Missing amino acid : C,H,T,Q,Y

Most occurring amino acid : K

Most occurring amino acid frequency : 7

Least occurring amino acid : W

Least occurring amino acid frequency : 1

Secondary structure fraction (Helix, Turn, Sheet): (0.4, 0.2, 0.3)

SMILES Notation: CC[C@H](C)[C@H](NC(=O)CNC(=O)[C@H](CC(=O)O)NC(=O)[C@H](CCCNC(=N)N)NC(=O)[C@@H](NC(=O)[C@H](CC(N)=O)NC(=O)[C@H](CCCNC(=N)N)NC(=O)CNC(=O)[C@H](CCSC)NC(=O)[C@H](CCCCN)NC(=O)[C@H](CCC(=O)O)NC(=O)[C@@H](NC(=O)[C@H](CCCCN)NC(=O)[C@H](CCCCN)NC(=O)[C@H](Cc1ccccc1)NC(=O)[C@@H](NC(=O)[C@H](CCCCN)NC(=O)[C@H](Cc1c[nH]c2ccccc12)NC(=O)[C@@H](N)CCCNC(=N)N)[C@@H](C)CC)[C@@H](C)CC)[C@@H](C)CC)C(=O)N[C@H](C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](C)C(=O)NCC(=O)N1CCC[C@H]1C(=O)N[C@@H](C)C(=O)N[C@H](C(=O)N[C@@H](CCC(=O)O)C(=O)N[C@H](C(=O)N[C@@H](CC(C)C)C(=O)NCC(=O)N[C@@H](CO)C(=O)N[C@@H](C)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](C)C(=O)N[C@H](C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)O)[C@@H](C)CC)C(C)C)[C@@H](C)CC)C(C)C

1 : Xia L, et al. Expression, purification and characterization of cecropin antibacterial peptide from Bombyx mori in Saccharomyces cerevisiae. Protein Expr Purif. 2013; 90:47-54. doi: 10.1016/j.pep.2013.02.013

Paper title : Expression, purification and characterization of cecropin antibacterial peptide from Bombyx mori in Saccharomyces cerevisiae.

Doi : https://doi.org/10.1016/j.pep.2013.02.013

Abstract : CecropinXJ is a cationic antimicrobial peptide originally isolated from the larvae of Bombyx mori. In this study, an antibacterial peptide gene of cecropinXJ was cloned into the pYES2/CT/α Factor expression vector and expressed in the Saccharomyces cerevisiae INVSc1 strain. Following an induction of recombinant protein expression in yeast for 120 h, the maximum amount of total secreted protein was 1.437 g/L. The percentage of recombinant cecropinXJ was estimated to be 79.45% of the total protein. After purification with Ni-NTA agarose column, recombinant cecropinXJ was noted to exert strong antimicrobial activities against a broad-spectrum of microorganisms, including Gram-negative and Gram-positive bacteria. Its minimal inhibitory concentration (MIC) against Escherichia coli ATCC25922 was 0.81 μM. In addition, transmission electron microscopy (TEM) analysis indicated that the surfaces of the treated pathogens underwent obvious morphological changes compared with the untreated controls, suggesting that this antimicrobial peptide exerts its action by directly disrupting membranes of microorganisms. CecropinXJ had a small hemolytic effect on red blood cells even with a peptide concentration of 200 μM. Thus, cecropinXJ acts selectively on bacterial membranes. Purified recombinant antibacterial peptide, cecropinXJ, retained a high stability against E. coli ATCC25922 over a temperature range from 4 °C to 100 °C and a pH range from pH 2.0 to 12.0. Taken together, this study demonstrates that recombinant cecropinXJ can be produced in large quantities in yeast with genetic engineering methods, and that it has strong and rapid antimicrobial activities against all of microorganisms tested. Our results suggest that cecropinXJ is a potential candidate for therapy.