Crystal structure of novel glutamine synthase homolog

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.209 

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This is version 1.2 of the entry. See complete history


Structure and Activity of PA5508, a Hexameric Glutamine Synthetase Homologue.

Ladner, J.E.Atanasova, V.Dolezelova, Z.Parsons, J.F.

(2012) Biochemistry 51: 10121-10123

  • DOI: https://doi.org/10.1021/bi3014856
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The structure of PA5508 from Pseudomonas aeruginosa, a glutamine synthetase (GS) homologue, has been determined at 2.5 Å. Surprisingly, PA5508 forms single hexameric rings rather than the stacked double rings that are characteristic of GS. The C-terminal helical thong motif that links GS rings is present in PA5508; however, it is folded back toward the core of its own polypeptide, preventing it from interacting with a second ring. Interestingly, PA5508 displays a clear preference for aromatic amine substrates. Unique aspects of the structure illustrate how the enzyme is able to catalyze reactions involving bulky amines rather than ammonia.

  • Organizational Affiliation

    Institute for Bioscience and Biotechnology Research, University of Maryland, MD, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Probable glutamine synthetase443Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: PA5508
Find proteins for Q9HT65 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9HT65 
Go to UniProtKB:  Q9HT65
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HT65
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.209 
  • Space Group: P 6
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 140.01α = 90
b = 140.01β = 90
c = 45.03γ = 120
Software Package:
Software NamePurpose
CrystalCleardata collection
CrystalCleardata reduction
CrystalCleardata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-12-26
    Type: Initial release
  • Version 1.1: 2013-01-02
    Changes: Database references
  • Version 1.2: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description