5CIV image
Deposition Date 2015-07-13
Release Date 2016-02-03
Last Version Date 2024-10-09
Entry Detail
PDB ID:
5CIV
Title:
Sibling Lethal Factor Precursor - DfsB
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
1.38 Å
R-Value Free:
0.19
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Sibling bacteriocin
Gene (Uniprot):dfsB
Chain IDs:A
Chain Length:184
Number of Molecules:1
Biological Source:Paenibacillus dendritiformis
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET modified residue
Primary Citation
Structures of the DfsB Protein Family Suggest a Cationic, Helical Sibling Lethal Factor Peptide.
J.Mol.Biol. 428 554 560 (2016)
PMID: 26804569 DOI: 10.1016/j.jmb.2016.01.013

Abstact

Bacteria have developed a variety of mechanisms for surviving harsh environmental conditions, nutrient stress and overpopulation. Paenibacillus dendritiformis produces a lethal protein (Slf) that is able to induce cell death in neighbouring colonies and a phenotypic switch in more distant ones. Slf is derived from the secreted precursor protein, DfsB, after proteolytic processing. Here, we present new crystal structures of DfsB homologues from a variety of bacterial species and a surprising version present in the yeast Saccharomyces cerevisiae. Adopting a four-helix bundle decorated with a further three short helices within intervening loops, DfsB belongs to a non-enzymatic class of the DinB fold. The structure suggests that the biologically active Slf fragment may possess a C-terminal helix rich in basic and aromatic residues that suggest a functional mechanism akin to that for cationic antimicrobial peptides.

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Primary Citation of related structures