Serine 25 to Threonine mutation of aspartate decarboxylase

Experimental Data Snapshot

  • Resolution: 1.29 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.153 

Starting Model: experimental
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This is version 1.5 of the entry. See complete history


Structural constraints on protein self-processing in L-aspartate-alpha-decarboxylase

Schmitzberger, F.Kilkenny, M.L.Lobley, C.M.C.Webb, M.E.Vinkovic, M.Matak-Vinkovic, D.Witty, M.Chirgadze, D.Y.Smith, A.G.Abell, C.Blundell, T.L.

(2003) EMBO J 22: 6193-6204

  • DOI: https://doi.org/10.1093/emboj/cdg575
  • Primary Citation of Related Structures:  
    1PPY, 1PQE, 1PQF, 1PQH, 1PT0, 1PT1, 1PYQ, 1PYU

  • PubMed Abstract: 

    Aspartate decarboxylase, which is translated as a pro-protein, undergoes intramolecular self-cleavage at Gly24-Ser25. We have determined the crystal structures of an unprocessed native precursor, in addition to Ala24 insertion, Ala26 insertion and Gly24-->Ser, His11-->Ala, Ser25-->Ala, Ser25-->Cys and Ser25-->Thr mutants. Comparative analyses of the cleavage site reveal specific conformational constraints that govern self-processing and demonstrate that considerable rearrangement must occur. We suggest that Thr57 Ogamma and a water molecule form an 'oxyanion hole' that likely stabilizes the proposed oxyoxazolidine intermediate. Thr57 and this water molecule are probable catalytic residues able to support acid-base catalysis. The conformational freedom in the loop preceding the cleavage site appears to play a determining role in the reaction. The molecular mechanism of self-processing, presented here, emphasizes the importance of stabilization of the oxyoxazolidine intermediate. Comparison of the structural features shows significant similarity to those in other self-processing systems, and suggests that models of the cleavage site of such enzymes based on Ser-->Ala or Ser-->Thr mutants alone may lead to erroneous interpretations of the mechanism.

  • Organizational Affiliation

    Department of Biochemistry, 80 Tennis Court Road, Cambridge CB2 1GA, UK. florian@cryst.bioc.cam.ac.uk

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Aspartate 1-decarboxylase
A, B
143Escherichia coliMutation(s): 2 
Gene Names: PAND
Find proteins for P0A790 (Escherichia coli (strain K12))
Explore P0A790 
Go to UniProtKB:  P0A790
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A790
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.29 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.153 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.46α = 90
b = 70.46β = 90
c = 215.299γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2003-11-18
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2015-04-29
    Changes: Non-polymer description
  • Version 1.4: 2021-10-27
    Changes: Database references, Derived calculations
  • Version 1.5: 2023-08-16
    Changes: Data collection, Refinement description