1GPW

Structural evidence for ammonia tunneling across the (beta/alpha)8 barrel of the imidazole glycerol phosphate synthase bienzyme complex.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.226 

Starting Model: experimental
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This is version 2.2 of the entry. See complete history


Literature

Structural Evidence for Ammonia Tunneling Across the (Beta Alpha)(8) Barrel of the Imidazole Glycerol Phosphate Synthase Bienzyme Complex.

Douangamath, A.Walker, M.Beismann-Driemeyer, S.Vega-Fernandez, M.C.Sterner, R.Wilmanns, M.

(2002) Structure 10: 185

  • DOI: https://doi.org/10.1016/s0969-2126(02)00702-5
  • Primary Citation of Related Structures:  
    1GPW, 1K9V

  • PubMed Abstract: 

    Since reactive ammonia is not available under physiological conditions, glutamine is used as a source for the incorporation of nitrogen in a number of metabolic pathway intermediates. The heterodimeric ImGP synthase that links histidine and purine biosynthesis belongs to the family of glutamine amidotransferases in which the glutaminase activity is coupled with a subsequent synthase activity specific for each member of the enzyme family. Its X-ray structure from the hyperthermophile Thermotoga maritima shows that the glutaminase subunit is associated with the N-terminal face of the (beta alpha)(8) barrel cyclase subunit. The complex reveals a putative tunnel for the transfer of ammonia over a distance of 25 A. Although ammonia tunneling has been reported for glutamine amidotransferases, the ImGP synthase has evolved a novel mechanism, which extends the known functional properties of the versatile (beta alpha)(8) barrel fold.


  • Organizational Affiliation

    EMBL Hamburg Outstation c/o DESY, Notkestrasse 85, D-22603 Hamburg, Germany.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HISF PROTEIN
A, C, E
253Thermotoga maritimaMutation(s): 1 
EC: 4.3.2.10
UniProt
Find proteins for Q9X0C6 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
Explore Q9X0C6 
Go to UniProtKB:  Q9X0C6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9X0C6
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
AMIDOTRANSFERASE HISH
B, D, F
201Thermotoga maritimaMutation(s): 0 
EC: 4.3.2.10 (UniProt), 3.5.1.2 (UniProt)
UniProt
Find proteins for Q9X0C8 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
Explore Q9X0C8 
Go to UniProtKB:  Q9X0C8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9X0C8
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.226 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74α = 90
b = 91.9β = 105.9
c = 131γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-02-10
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2017-07-12
    Changes: Advisory, Atomic model, Derived calculations
  • Version 2.1: 2019-07-24
    Changes: Data collection
  • Version 2.2: 2023-12-13
    Changes: Data collection, Database references, Refinement description