1QWJ

The Crystal Structure of Murine CMP-5-N-Acetylneuraminic Acid Synthetase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.240 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Crystal Structure of Murine CMP-5-N-acetylneuraminic Acid Synthetase

Krapp, S.Muenster-Kuehnel, A.K.Kaiser, J.T.Huber, R.Tiralongo, J.Gerardy-Schahn, R.Jacob, U.

(2003) J.Mol.Biol. 334: 625-637


  • PubMed Abstract: 
  • Sialic acids are activated by CMP-5-N-acetylneuraminic acid synthetase prior to their transfer onto oligo- or polysaccharides. Here, we present the crystal structure of the N-terminal catalytically active domain of the murine 5-N-acetylneuraminic aci ...

    Sialic acids are activated by CMP-5-N-acetylneuraminic acid synthetase prior to their transfer onto oligo- or polysaccharides. Here, we present the crystal structure of the N-terminal catalytically active domain of the murine 5-N-acetylneuraminic acid synthetase in complex with the reaction product. In contrast to the previously solved structure of 5-N-acetylneuraminic acid synthetase from Neisseria meningitidis and the related CMP-KDO-synthetase of Escherichia coli, the murine enzyme is a tetramer, which was observed with the active sites closed. In this conformation a loop is shifted by 6A towards the active site and thus an essential arginine residue can participate in catalysis. Furthermore, a network of intermolecular salt-bridges and hydrogen bonds in the dimer as well as hydrophobic interfaces between two dimers indicate a cooperative behaviour of the enzyme. In addition, a complex regulation of the enzyme activity is proposed that includes phosphorylation and dephosphorylation.


    Organizational Affiliation

    Max-Planck-Institut für Biochemie, Abteilung für Strukturforschung, Am Klopferspitz 18a, 82152, Martinsried, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
cytidine monophospho-N-acetylneuraminic acid synthetase
A, B, C, D
229Mus musculusGene Names: Cmas
EC: 2.7.7.43
Find proteins for Q99KK2 (Mus musculus)
Go to UniProtKB:  Q99KK2
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NCC
Query on NCC

Download SDF File 
Download CCD File 
A, C, D
CYTIDINE-5'-MONOPHOSPHATE-5-N-ACETYLNEURAMINIC ACID
C20 H31 N4 O16 P
TXCIAUNLDRJGJZ-BILDWYJOSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.240 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 74.048α = 90.00
b = 79.941β = 90.00
c = 170.251γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
CNSrefinement
CCP4data scaling
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-12-09
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance