1LLW

Structural studies on the synchronization of catalytic centers in glutamate synthase: complex with 2-oxoglutarate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.234 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural studies on the synchronization of catalytic centers in glutamate synthase

van den Heuvel, R.H.Ferrari, D.Bossi, R.T.Ravasio, S.Curti, B.Vanoni, M.A.Florencio, F.J.Mattevi, A.

(2002) J.BIOL.CHEM. 277: 24579-24583

  • DOI: 10.1074/jbc.M202541200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The complex iron-sulfur flavoprotein glutamate synthase (GltS) plays a prominent role in ammonia assimilation in bacteria, yeasts, and plants. GltS catalyzes the formation of two molecules of l-glutamate from 2-oxoglutarate and l-glutamine via intram ...

    The complex iron-sulfur flavoprotein glutamate synthase (GltS) plays a prominent role in ammonia assimilation in bacteria, yeasts, and plants. GltS catalyzes the formation of two molecules of l-glutamate from 2-oxoglutarate and l-glutamine via intramolecular channeling of ammonia. GltS has the impressive ability of synchronizing its distinct catalytic centers to avoid wasteful consumption of l-glutamine. We have determined the crystal structure of the ferredoxin-dependent GltS in several ligation and redox states. The structures reveal the crucial elements in the synchronization between the glutaminase site and the 2-iminoglutarate reduction site. The structural data combined with the catalytic properties of GltS indicate that binding of ferredoxin and 2-oxoglutarate to the FMN-binding domain of GltS induce a conformational change in the loop connecting the two catalytic centers. The rearrangement induces a shift in the catalytic elements of the amidotransferase domain, such that it becomes activated. This machinery, over a distance of more than 30 A, controls the ability of the enzyme to bind and hydrolyze the ammonia-donating substrate l-glutamine.


    Organizational Affiliation

    Department of Genetics and Microbiology, University of Pavia, via Abbiategrasso 207, 27100 Pavia, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ferredoxin-dependent glutamate synthase
A
1520Synechocystis sp. (strain PCC 6803 / Kazusa)Mutation(s): 0 
Gene Names: gltS
EC: 1.4.7.1
Find proteins for P55038 (Synechocystis sp. (strain PCC 6803 / Kazusa))
Go to UniProtKB:  P55038
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
F3S
Query on F3S

Download SDF File 
Download CCD File 
A
FE3-S4 CLUSTER
Fe3 S4
FCXHZBQOKRZXKS-MZMDZPPWAW
 Ligand Interaction
FMN
Query on FMN

Download SDF File 
Download CCD File 
A
FLAVIN MONONUCLEOTIDE
RIBOFLAVIN MONOPHOSPHATE
C17 H21 N4 O9 P
FVTCRASFADXXNN-SCRDCRAPSA-N
 Ligand Interaction
AKG
Query on AKG

Download SDF File 
Download CCD File 
A
2-OXOGLUTARIC ACID
C5 H6 O5
KPGXRSRHYNQIFN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.234 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 166.521α = 90.00
b = 166.521β = 90.00
c = 219.874γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
AMoREphasing
MOSFLMdata reduction
SCALAdata scaling
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-07-31
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance