Experimental Data Snapshot

  • Resolution: 1.00 Å
  • R-Value Free: 0.135 
  • R-Value Observed: 0.119 

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This is version 2.0 of the entry. See complete history


Structures of Two Histidine Ammonia-Lyase Modifications and Implications for the Catalytic Mechanism

Baedeker, M.Schulz, G.E.

(2002) Eur J Biochem 269: 1790

  • DOI: https://doi.org/10.1046/j.1432-1327.2002.02827.x
  • Primary Citation of Related Structures:  
    1GKJ, 1GKM

  • PubMed Abstract: 

    Histidine ammonia-lyase (EC catalyzes the nonoxidative elimination of the alpha-amino group of histidine using a 4-methylidene-imidazole-5-one (MIO), which is formed autocatalytically from the internal peptide segment 142Ala-Ser-Gly. The structure of the enzyme inhibited by a reaction with l-cysteine was established at the very high resolution of 1.0 A. Five active center mutants were produced and their catalytic activities were measured. Among them, mutant Tyr280-->Phe could be crystallized and its structure could be determined at 1.7 A resolution. It contains a planar sp2-hybridized 144-N atom of MIO, in contrast to the pyramidal sp3-hybridized 144-N of the wild-type. With the planar 144-N atom, MIO assumes the conformation of a putative intermediate aromatic state of the reaction, demonstrating that the conformational barrier between aromatic and wild-type states is very low. The data led to a new proposal for the geometry for the catalyzed reaction, which also applies to the closely related phenylalanine ammonia-lyase (EC Moreover, it suggested an intermediate binding site for the released ammonia.

  • Organizational Affiliation

    Institut für Organische Chemie und Biochemie, Albert-Ludwigs-Universität, Freiburg im Breisgau, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HISTIDINE AMMONIA-LYASE507Pseudomonas putidaMutation(s): 2 
Find proteins for P21310 (Pseudomonas putida)
Explore P21310 
Go to UniProtKB:  P21310
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP21310
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.00 Å
  • R-Value Free: 0.135 
  • R-Value Observed: 0.119 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.267α = 90
b = 116.788β = 90
c = 129.532γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-04-05
    Type: Initial release
  • Version 1.1: 2011-09-07
    Changes: Advisory, Atomic model, Database references, Derived calculations, Non-polymer description, Other, Refinement description, Structure summary, Version format compliance
  • Version 1.2: 2019-07-24
    Changes: Data collection, Derived calculations
  • Version 1.3: 2019-10-23
    Changes: Data collection, Database references, Other
  • Version 2.0: 2023-11-15
    Changes: Atomic model, Data collection, Database references, Derived calculations