Crystal structure of human alpha-defensin 1 (W26Ahp mutant)

Experimental Data Snapshot

  • Resolution: 1.56 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.191 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Trp-26 imparts functional versatility to human alpha-defensin HNP1.

Wei, G.Pazgier, M.de Leeuw, E.Rajabi, M.Li, J.Zou, G.Jung, G.Yuan, W.Lu, W.Y.Lehrer, R.I.Lu, W.

(2010) J Biol Chem 285: 16275-16285

  • DOI: https://doi.org/10.1074/jbc.M110.102749
  • Primary Citation of Related Structures:  
    3H6C, 3LO1, 3LO2, 3LO4, 3LO6, 3LO9, 3LOE, 3LVX

  • PubMed Abstract: 

    We performed a comprehensive alanine scan of human alpha-defensin HNP1 and tested the ability of the resulting analogs to kill Staphylococcus aureus, inhibit anthrax lethal factor, and bind human immunodeficiency virus-1 gp120. By far, the most deleterious mutation for all of these functions was W26A. The activities lost by W26A-HNP1 were restored progressively by replacing W26 with non-coded, straight-chain aliphatic amino acids of increasing chain length. The hydrophobicity of residue 26 also correlated with the ability of the analogs to bind immobilized wild type HNP1 and to undergo further self-association. Thus, the hydrophobicity of residue 26 is not only a key determinant of the direct interactions of HNP1 with target molecules, but it also governs the ability of this peptide to form dimers and more complex quaternary structures at micromolar concentrations. Although all defensin peptides are cationic, their amphipathicity is at least as important as their positive charge in enabling them to participate in innate host defense.

  • Organizational Affiliation

    Institute of Human Virology, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Neutrophil defensin 1
A, B
30N/AMutation(s): 1 
UniProt & NIH Common Fund Data Resources
Find proteins for P59665 (Homo sapiens)
Explore P59665 
Go to UniProtKB:  P59665
PHAROS:  P59665
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP59665
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on AHP
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 1.56 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.191 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.146α = 90
b = 30.645β = 90
c = 39.82γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-2000data collection
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-03-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2021-10-13
    Changes: Database references, Derived calculations
  • Version 1.3: 2023-09-06
    Changes: Data collection, Refinement description