2MXQ | pdb_00002mxq

The solution structure of DEFA1, a highly potent antimicrobial peptide from the horse

• PDB DOI: https://doi.org/10.2210/pdb2MXQ/pdb
• BMRB: 25424

• Classification: ANTIMICROBIAL PROTEIN
• Organism(s): Equus caballus
• Mutation(s): No 
• Membrane Protein: Yes  OPM


• Deposited: 2015-01-12 Released: 2015-04-22 
• Deposition Author(s): Jung, S., Michalek, M., Shomali, M., Soennichsen, F.D.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 

Literature

Solution structure and functional studies of the highly potent equine antimicrobial peptide DEFA1.

Michalek, M., Jung, S., Shomali, M.R., Cauchard, S., Sonnichsen, F.D., Grotzinger, J.

(2015) Biochem Biophys Res Commun 459: 668-672

• PubMed: 25769951 
• DOI: https://doi.org/10.1016/j.bbrc.2015.02.168
• Primary Citation Related Structures: 
  2MXQ


• PubMed Abstract: 
  

  Defensins are small effector molecules of the innate immune system that are present in almost all organisms including plants and animals. These peptides possess antimicrobial activity against a broad range of microbes including bacteria, fungi and viruses and act as endogenous antibiotics. α-Defensins are a subfamily of the defensin family and their expression is limited to specific tissues. Equine DEFA1 is an enteric α-defensin exclusively secreted by Paneth cells and shows an activity against a broad spectrum of microbes, including typical pathogens of the horse such as Rhodococcus equi, various streptococci strains, Salmonella choleraesuis, and Pasteurella multocida. Here, we report the three-dimensional structure of DEFA1 solved by NMR-spectroscopy and demonstrate its specific function of aggregating various phospholipids.

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Organizational Affiliation: 
• Institute of Biochemistry, Christian-Albrechts-Universität zu Kiel, Olshausenstr. 40, 24098 Kiel, Germany.
ANSES, Dozulé Laboratory for Equine Diseases, Bacteriology and Parasitology Unit, 14430 Goustranville, France.
Otto Diels Institute of Organic Chemistry, Christian-Albrechts-Universität zu Kiel, Olshausenstr. 40, 24098 Kiel, Germany.
Institute of Biochemistry, Christian-Albrechts-Universität zu Kiel, Olshausenstr. 40, 24098 Kiel, Germany. Electronic address: [e-mail].

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 4.09 kDa 
• Atom Count: 280 
• Modeled Residue Count: 34 
• Deposited Residue Count: 34 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Paneth cell-specific alpha-defensin 1	A	34	Equus caballus	Mutation(s): 0  Membrane Entity: Yes
UniProt
Find proteins for A6YB85 (Equus caballus) Explore A6YB85  Go to UniProtKB:  A6YB85

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2015-04-22 
Deposition Author(s): Jung, S., Michalek, M., Shomali, M., Soennichsen, F.D.

Revision History  

• Version 1.0: 2015-04-22
  Type: Initial release
  
• Version 1.1: 2023-06-14
  Changes: Database references, Other
• Version 1.2: 2024-11-20
  Changes: Data collection, Database references, Structure summary