3L76

Crystal Structure of Aspartate Kinase from Synechocystis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.199 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

A new mode of dimerization of allosteric enzymes with ACT domains revealed by the crystal structure of the aspartate kinase from Cyanobacteria

Robin, A.Y.Cobessi, D.Curien, G.Robert-Genthon, M.Ferrer, J.-L.Dumas, R.

(2010) J.Mol.Biol. 399: 283-293

  • DOI: 10.1016/j.jmb.2010.04.014

  • PubMed Abstract: 
  • Aspartate kinases (AKs) can be divided in two subhomology divisions, AKalpha and AKbeta, depending on the presence of an extra sequence of about 60 amino acids, which is found only in the N-terminus of all AKalpha's. To date, the structures of AKalph ...

    Aspartate kinases (AKs) can be divided in two subhomology divisions, AKalpha and AKbeta, depending on the presence of an extra sequence of about 60 amino acids, which is found only in the N-terminus of all AKalpha's. To date, the structures of AKalpha failed to provide a role for this additional N-terminal sequence. In this study, the structure of the AKbeta from the Cyanobacteria Synechocystis reveals that this supplementary sequence is linked to the dimerization mode of AKs. Its absence in AKbeta leads to the dimerization by the catalytic domain instead of involving the ACT domains [Pfam 01842; small regulatory domains initially found in AK, chorismate mutase and TyrA (prephenate dehydrogenase)] as observed in AKalpha. Thus, the structural analysis of the Synechocystis AKbeta revealed a dimer with a novel architecture. The four ACT domains of each monomer interact together and do not make any contact with those of the second monomer. The enzyme is inhibited synergistically by threonine and lysine with the binding of threonine first. The interaction between ACT1 and ACT4 or between ACT2 and ACT3 generates a threonine binding site and a lysine binding site at each interface, making a total of eight regulatory sites per dimer and allowing a fine-tuning of the AK activity by the end products, threonine and lysine.


    Organizational Affiliation

    Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5168, Grenoble, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Aspartokinase
A, B
600Synechocystis sp. (strain PCC 6803 / Kazusa)Mutation(s): 0 
Gene Names: lysC
Find proteins for P74569 (Synechocystis sp. (strain PCC 6803 / Kazusa))
Go to UniProtKB:  P74569
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

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Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
LYS
Query on LYS

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Download CCD File 
A, B
LYSINE
C6 H15 N2 O2
KDXKERNSBIXSRK-YFKPBYRVSA-O
 Ligand Interaction
THR
Query on THR

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Download CCD File 
A, B
THREONINE
C4 H9 N O3
AYFVYJQAPQTCCC-GBXIJSLDSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.199 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 86.210α = 90.00
b = 237.710β = 90.00
c = 150.080γ = 90.00
Software Package:
Software NamePurpose
XDSdata scaling
XDSdata reduction
PHENIXrefinement
Nemo/Xnemodata collection
SOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-06-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance