6S5P image
Entry Detail
PDB ID:
6S5P
Title:
Cfucosylated peptide SBL2 bound to Fucose binding Lectin LecB (PA-IIL) from Pseudomonas aeruginosa at 1.46 Angstrom resolution
Biological Source:
PDB Version:
Deposition Date:
2019-07-02
Release Date:
2019-08-21
Method Details:
Experimental Method:
Resolution:
1.46 Å
R-Value Free:
0.19
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Fucose-binding lectin
Chain IDs:A, B, C, D
Chain Length:115
Number of Molecules:4
Biological Source:Pseudomonas aeruginosa
Polymer Type:polypeptide(L)
Description:SBL2
Chain IDs:E (auth: H), F (auth: E), G (auth: F)
Chain Length:7
Number of Molecules:3
Biological Source:synthetic construct
Primary Citation
X-ray Crystal Structures of Short Antimicrobial Peptides as Pseudomonas aeruginosa Lectin B Complexes.
Acs Chem.Biol. 14 758 766 (2019)
PMID: 30830745 DOI: 10.1021/acschembio.9b00047

Abstact

Herein, we report X-ray crystal structures of 11-13 residue antimicrobial peptides (AMPs) active against Pseudomonas aeruginosa as complexes of fucosylated d-enantiomeric sequences with the P. aeruginosa lectin LecB. These represent the first crystal structures of short AMPs. In 24 individual structures of eight different peptides, we found mostly α-helices assembled as two-helix or four-helix bundles with a hydrophobic core and cationic residues pointing outside. Two of the analogs formed an extended structure engaging in multiple contacts with the lectin. Molecular dynamics (MD) simulations showed that α-helices are stabilized by bundle formation and suggested that the N-terminal acyl group present in the linker to the fucosyl group can extend the helix by one additional H-bond and increase α-helix amphiphilicity. Investigating N-terminal acylation led to AMPs with equivalent and partly stronger antibacterial effects compared to the free peptide.

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