Peptide name : Microcin E492

Source/Organism : Friedländer's bacillus

Linear/Cyclic : Not found

Chirality : L

Peptide length: 84

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 : Not found

Other activity : Anti-microbial activity

Amino acid composition bar chart :

Molecular mass : 7936.5329 Dalton

Aliphatic index : 0.814

Instability index : 18.9131

Hydrophobicity (GRAVY) : 0.0655

Isoelectric point : 4.05

Charge (pH 7) : -4.1476

Aromaticity : 0.047

Molar extinction coefficient (cysteine, cystine): (12490, 12490)

Hydrophobic/hydrophilic ratio : 1.86206896

hydrophobic moment : 0.0166

Missing amino acid : C,K,R

Most occurring amino acid : G

Most occurring amino acid frequency : 19

Least occurring amino acid : E

Least occurring amino acid frequency : 1

Secondary structure fraction (Helix, Turn, Sheet): (0.2, 0.5, 0.2)

SMILES Notation: CC[C@H](C)[C@H](NC(=O)[C@H](CC(C)C)NC(=O)[C@@H](NC(=O)[C@@H]1CCCN1C(=O)[C@@H](NC(=O)[C@H](Cc1ccccc1)NC(=O)[C@@H](NC(=O)[C@H](CC(N)=O)NC(=O)[C@@H](NC(=O)[C@@H]1CCCN1C(=O)CNC(=O)[C@H](Cc1c[nH]cn1)NC(=O)[C@H](CC(=O)O)NC(=O)[C@@H](NC(=O)[C@H](CC(C)C)NC(=O)CNC(=O)[C@H](CCC(N)=O)NC(=O)CNC(=O)[C@@H](NC(=O)[C@@H](NC(=O)[C@H](CCC(N)=O)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](C)NC(=O)CNC(=O)CNC(=O)[C@H](C)NC(=O)[C@H](C)NC(=O)CNC(=O)[C@H](CC(C)C)NC(=O)[C@H](C)NC(=O)[C@H](C)NC(=O)[C@H](CO)NC(=O)CNC(=O)[C@H](CC(C)C)NC(=O)CNC(=O)CNC(=O)[C@@H]1CCCN1C(=O)[C@H](C)NC(=O)CNC(=O)[C@H](CC(C)C)NC(=O)[C@H](C)NC(=O)[C@H](C)NC(=O)CNC(=O)[C@H](Cc1c[nH]c2ccccc12)NC(=O)[C@H](C)NC(=O)[C@H](CCSC)NC(=O)[C@H](CC(N)=O)NC(=O)[C@H](CC(N)=O)NC(=O)CNC(=O)[C@H](CC(C)C)NC(=O)[C@H](CC(=O)O)NC(=O)[C@H](CC(N)=O)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](CCC(N)=O)NC(=O)[C@@H](NC(=O)[C@H](CC(N)=O)NC(=O)[C@@H]1CCCN1C(=O)[C@H](CC(=O)O)NC(=O)[C@@H](NC(=O)[C@H](CCC(=O)O)NC(=O)CN)[C@@H](C)O)[C@@H](C)O)[C@@H](C)O)C(C)C)[C@@H](C)CC)C(C)C)C(C)C)[C@@H](C)CC)C(C)C)C(=O)NCC(=O)N1CCC[C@H]1C(=O)N[C@@H](CO)C(=O)N[C@@H](Cc1c[nH]c2ccccc12)C(=O)N[C@@H](CC(N)=O)C(=O)NCC(=O)N[C@@H](CO)C(=O)NCC(=O)N[C@@H](CO)C(=O)NCC(=O)N[C@@H](Cc1ccc(O)cc1)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CO)C(=O)N[C@@H](C)C(=O)N[C@H](C(=O)N[C@@H](CO)C(=O)N[C@@H](CO)C(=O)N[C@@H](CO)C(=O)NCC(=O)N[C@@H](CO)C(=O)NCC(=O)N[C@@H](CO)C(=O)O)[C@@H](C)O

1 : Wang G, et al. APD2: the updated antimicrobial peptide database and its application in peptide design. Nucleic Acids Res. 2009; 37:D933-7. doi: 10.1093/nar/gkn823

2 : de Lorenzo V. Isolation and characterization of microcin E492 from Klebsiella pneumoniae. Arch Microbiol. 1984; 139:72-5. doi: 10.1007/BF00692715

Paper title : APD2: the updated antimicrobial peptide database and its application in peptide design.

Doi : https://doi.org/10.1093/nar/gkn823

Abstract : The antimicrobial peptide database (APD, http://aps.unmc.edu/AP/main.php) has been updated and expanded. It now hosts 1228 entries with 65 anticancer, 76 antiviral (53 anti-HIV), 327 antifungal and 944 antibacterial peptides. The second version of our database (APD2) allows users to search peptide families (e.g. bacteriocins, cyclotides, or defensins), peptide sources (e.g. fish, frogs or chicken), post-translationally modified peptides (e.g. amidation, oxidation, lipidation, glycosylation or d-amino acids), and peptide binding targets (e.g. membranes, proteins, DNA/RNA, LPS or sugars). Statistical analyses reveal that the frequently used amino acid residues (>10%) are Ala and Gly in bacterial peptides, Cys and Gly in plant peptides, Ala, Gly and Lys in insect peptides, and Leu, Ala, Gly and Lys in amphibian peptides. Using frequently occurring residues, we demonstrate database-aided peptide design in different ways. Among the three peptides designed, GLK-19 showed a higher activity against Escherichia coli than human LL-37.

Paper title : Isolation and characterization of microcin E492 from Klebsiella pneumoniae.

Doi : https://doi.org/10.1007/BF00692715

Abstract : The production of a dialyzable peptidic antibacterial named microcin E492 by the strain of faecal origin Klebsiella pneumoniae RYC492 has previously been reported. In this paper, a procedure to extract this antibiotic from liquid cultures of the producer strain is described. This method was based in the quantitative retention of the microcin on the hydrophobic matrix Bondapak C18 and led to highly active pigment- and salt-free concentrates appropriate for further purification by high pressure liquid chromatography. The characterization of purified preparations indicated that microcin E492 was a basic and hydrophobic peptide with an apparent molecular mass of about 5,000, acid- and heat-resistant and much more active in minimal than in rich medium. These properties are discussed with regard to the likely ecological role of the microcin in the microbial ecosystem of the intestine.