Histidine Ammonia-Lyase (HAL) Mutant F329G from Pseudomonas putida

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.226 
  • R-Value Observed: 0.170 

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This is version 1.3 of the entry. See complete history


Autocatalytic Peptide Cyclization During Chain Folding of Histidine Ammonia-Lyase.

Baedeker, M.Schulz, G.E.

(2002) Structure 10: 61-67

  • DOI: https://doi.org/10.1016/s0969-2126(01)00692-x
  • Primary Citation of Related Structures:  
    1EB4, 1GK2, 1GK3

  • PubMed Abstract: 

    Histidine ammonia-lyase requires a 4-methylidene-imidazole-5-one group (MIO) that is produced autocatalytically by a cyclization and dehydration step in a 3-residue loop of the polypeptide. The crystal structures of three mutants have been established. Two mutants were inactive and failed to form MIO, but remained unchanged elsewhere. The third mutant showed very low activity and formed MIO, although it differed from an MIO-less mutant only by an additional 329-C(beta) atom. This atom forms one constraint during MIO formation, the other being the strongly connected Asp145. An exploration of the conformational space of the MIO-forming loop showed that the cyclization is probably enforced by a mechanic compression in a late stage of chain folding and is catalyzed by a well-connected internal water molecule. The cyclization of the respective 3-residue loop of green fluorescent protein is likely to occur in a similar reaction.

  • Organizational Affiliation

    Institut für Organische Chemie und Biochemie, Albert-Ludwigs-Universität, D-79104 Freiburg im Breisgau, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
509Pseudomonas 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: 1.90 Å
  • R-Value Free: 0.226 
  • R-Value Observed: 0.170 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.966α = 90
b = 130.561β = 91
c = 115.835γ = 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: 2002-02-21
    Type: Initial release
  • Version 1.1: 2011-09-07
    Changes: Database references, Derived calculations, Non-polymer description, Other, Structure summary, Version format compliance
  • Version 1.2: 2018-06-20
    Changes: Advisory, Data collection, Database references, Structure summary
  • Version 1.3: 2024-05-08
    Changes: Advisory, Data collection, Database references, Derived calculations, Other