Biological Assembly 1  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 3.46 kDa 
• Atom Count: 244 
• Residue Count: 30 
• Unique protein chains: 1

4B19

S. aureus pepA1 NMR structure

• DOI: 10.2210/pdb4B19/pdb
• BMRB: 18590

• Classification: TOXIN
• Organism(s): Staphylococcus aureus
• Mutation(s): No 


• Deposited: 2012-07-09 Released: 2012-11-14 
• Deposition Author(s): Sayed, N., Nonin-Lecomte, S., Rety, S., Felden, B.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 1000 
• Conformers Submitted: 5 
• Selection Criteria: LEAST RESTRAINT VIOLATIONS 

Literature

Functional and Structural Insights of a Staphylococcus Aureus Apoptotic-Like Membrane Peptide from a Toxin-Antitoxin Module

Sayed, N., Nonin-Lecomte, S., Rety, S., Felden, B.

(2012) J Biol Chem 287: 43454

• PubMed: 23129767 
• DOI: 10.1074/jbc.M112.402693
• Primary Citation of Related Structures:  
  4B19


• PubMed Abstract: 
  

We report a functional type I toxin-antitoxin (TA) module expressed by a human pathogen, Staphylococcus aureus. TA systems consist of stable toxins and labile antitoxins encoded within small genetic modules widespread in eubacteria and archaea. TA genes provide stress adaptation and protection against DNA loss or invasion. The genes encoding the SprA1 toxic peptide (PepA1) and the SprA1(AS) RNA antitoxin are within a pathogenicity island on opposite strands and possess a 3' overlap. To prevent peptide toxicity during S. aureus growth, PepA1 expression from stable (half-life > 3 h) SprA1 is repressed by elevated amounts of unstable (half-life = ∼10 mn) SprA1(AS). In vivo, PepA1 localizes at the bacterial membrane and triggers S. aureus death. Based on NMR and CD data, its solution structure was solved and is a long bent, interrupted helix. Molecular dynamics simulations indicate that PepA1 compaction and helical content fluctuate in accordance with its cytoplasm or membrane location. When inserted into the S. aureus membrane, the PepA1 conformation switches to a ∼7-nm-long continuous helix, presumably forming pores to alter membrane integrity. PepA1 expression is induced upon acidic and oxidative stresses by reducing SprA1(AS) levels. As an altruistic behavior during infection, some cells may induce the expression of that toxin that would facilitate departure from the host immune cells for spreading.

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Organizational Affiliation: 

INSERM U835-Upres EA2311, Biochimie Pharmaceutique, Université de Rennes 1, 35043 Rennes Cedex, France.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PEPA1	A	30	Staphylococcus aureus	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 1000 
• Conformers Submitted: 5 
• Selection Criteria: LEAST RESTRAINT VIOLATIONS 
• OLDERADO: 4B19 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-07-09 
• Released Date: 2012-11-14 
Deposition Author(s): Sayed, N., Nonin-Lecomte, S., Rety, S., Felden, B.

Revision History 

• Version 1.0: 2012-11-14
  Type: Initial release
  
• Version 1.1: 2012-11-21
  Changes: Database references
• Version 1.2: 2013-01-16
  Changes: Database references