1QWJ

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 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

  • DOI: 10.1016/j.jmb.2003.09.080
  • Primary Citation of Related Structures:  
    1QWJ

  • 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 acid sy ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
cytidine monophospho-N-acetylneuraminic acid synthetase ABCD229Mus musculusMutation(s): 0 
Gene Names: Cmas
EC: 2.7.7.43
Find proteins for Q99KK2 (Mus musculus)
Explore Q99KK2 
Go to UniProtKB:  Q99KK2
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NCC
Query on NCC

Download Ideal Coordinates 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: 2.80 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
b = 79.941β = 90
c = 170.251γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
CNSrefinement
CCP4data scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

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