1.8 Angstrom structure of intact native wild-type alpha-1-antitrypsin

Experimental Data Snapshot

  • Resolution: 1.81 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 

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Therapeutic target-site variability in [alpha]1-antitrypsin characterized at high resolution

Patschull, A.O.Segu, L.Nyon, M.P.Lomas, D.A.Nobeli, I.Barrett, T.E.Gooptu, B.

(2011) Acta Crystallogr Sect F Struct Biol Cryst Commun 67: 1492-1497

  • DOI: https://doi.org/10.1107/S1744309111040267
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The intrinsic propensity of α(1)-antitrypsin to undergo conformational transitions from its metastable native state to hyperstable forms provides a motive force for its antiprotease function. However, aberrant conformational change can also occur via an intermolecular linkage that results in polymerization. This has both loss-of-function and gain-of-function effects that lead to deficiency of the protein in human circulation, emphysema and hepatic cirrhosis. One of the most promising therapeutic strategies being developed to treat this disease targets small molecules to an allosteric site in the α(1)-antitrypsin molecule. Partial filling of this site impedes polymerization without abolishing function. Drug development can be improved by optimizing data on the structure and dynamics of this site. A new 1.8 Å resolution structure of α(1)-antitrypsin demonstrates structural variability within this site, with associated fluctuations in its upper and lower entrance grooves and ligand-binding characteristics around the innermost stable enclosed hydrophobic recess. These data will allow a broader selection of chemotypes and derivatives to be tested in silico and in vitro when screening and developing compounds to modulate conformational change to block the pathological mechanism while preserving function.

  • Organizational Affiliation

    Institute of Structural and Molecular Biology, Crystallography, Department of Biological Sciences, Birkbeck College, London, England.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alpha-1-antitrypsin424Homo sapiensMutation(s): 0 
Gene Names: SERPINA114q32AATPIPRO0684PRO2209
UniProt & NIH Common Fund Data Resources
Find proteins for P01009 (Homo sapiens)
Explore P01009 
Go to UniProtKB:  P01009
GTEx:  ENSG00000197249 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01009
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.81 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 114.38α = 90
b = 38.94β = 104.29
c = 88.83γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-12-14
    Type: Initial release
  • Version 1.1: 2023-09-06
    Changes: Data collection, Database references, Refinement description