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 

wwPDB Validation 3D Report Full Report


This is version 2.1 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: 10.1016/s0969-2126(02)00702-5
  • Primary Citation of Related Structures:  
    1K9V, 1GPW

  • 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 ...

    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.


    Related Citations: 
    • Imidazole Glycerol Phosphate Synthase from Thermotoga Maritima
      Beismann-Driemeyer, S., Sterner, R.
      (2001) J Biol Chem 276: 20387

    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HISF PROTEINACE253Thermotoga maritimaMutation(s): 1 
EC: 4.3.2.10
Find proteins for Q9X0C6 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Explore Q9X0C6 
Go to UniProtKB:  Q9X0C6
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
AMIDOTRANSFERASE HISHBDF201Thermotoga maritimaMutation(s): 0 
EC: 4.3.2.10 (UniProt), 3.5.1.2 (UniProt)
Find proteins for Q9X0C8 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Explore Q9X0C8 
Go to UniProtKB:  Q9X0C8
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download CCD File 
A, C, E
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
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 

  • 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