Crystal Structure Analysis of the Cathelicidin Motif of Protegrins

Experimental Data Snapshot

  • Resolution: 2.19 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.229 

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Structure of the cathelicidin motif of protegrin-3 precursor: structural insights into the activation mechanism of an antimicrobial protein.

Sanchez, J.F.Hoh, F.Strub, M.P.Aumelas, A.Dumas, C.

(2002) Structure 10: 1363-1370

  • DOI: https://doi.org/10.1016/s0969-2126(02)00859-6
  • Primary Citation of Related Structures:  
    1KWI, 1LXE

  • PubMed Abstract: 

    Cathelicidins are a family of antimicrobial proteins isolated from leucocytes and epithelia cells that contribute to the innate host defense mechanisms in mammalians. Located in the C-terminal part of the holoprotein, the cathelicidin-derived antimicrobial peptide is liberated by a specific protease cleavage. Here, we report the X-ray structure of the cathelicidin motif of protegrin-3 solved by MAD phasing using the selenocysteine-labeled protein. Its overall structure represents a fold homologous to the cystatin family and adopts two native states, a monomer, and a domain-swapped dimer. This crystal structure is the first example of a structural characterization of the highly conserved cathelicidin motif and thus provides insights into the possible mechanism of activation of the antimicrobial protegrin peptide.

  • Organizational Affiliation

    Centre de Biochimie Structurale, UMR CNRS 5048, UMR 554 INSERM, Université Montpellier I, 15 Avenue Charles Flahault, 34060 Montpellier Cedex, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protegrin-3 Precursor101Sus scrofaMutation(s): 0 
Gene Names: pg3NPG3
Find proteins for P32196 (Sus scrofa)
Explore P32196 
Go to UniProtKB:  P32196
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP32196
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.19 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.229 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.36α = 90
b = 51.36β = 90
c = 133.677γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
RESOLVEmodel building

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-10-09
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance