Crystal Structure of 3,4-dihydroxy-2-butanone 4-phosphate synthase in complex with two Magnesium ions

Experimental Data Snapshot

  • Resolution: 0.98 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.178 

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Structural definition of the active site and catalytic mechanism of 3,4-dihydroxy-2-butanone-4-phosphate synthase.

Liao, D.I.Zheng, Y.J.Viitanen, P.V.Jordan, D.B.

(2002) Biochemistry 41: 1795-1806

  • DOI: https://doi.org/10.1021/bi015652u
  • Primary Citation of Related Structures:  
    1K49, 1K4I, 1K4L, 1K4O, 1K4P

  • PubMed Abstract: 

    X-ray crystal structures of L-3,4-dihydroxy-2-butanone-4-phosphate synthase from Magnaporthe grisea are reported for the E-SO(4)(2-), E-SO(4)(2-)-Mg(2+), E-SO(4)(2)(-)-Mn(2+), E-SO(4)(2)(-)-Mn(2+)-glycerol, and E-SO(4)(2)(-)-Zn(2+) complexes with resolutions that extend to 1.55, 0.98, 1.60, 1.16, and 1.00 A, respectively. Active-site residues of the homodimer are fully defined. The structures were used to model the substrate ribulose 5-phosphate in the active site with the phosphate group anchored at the sulfate site and the placement of the ribulose group guided by the glycerol site. The model includes two Mg(2+) cations that bind to the oxygen substituents of the C2, C3, C4, and phosphate groups of the substrate, the side chains of Glu37 and His153, and water molecules. The position of the metal cofactors and the substrate's phosphate group are further stabilized by an extensive hydrogen-bond and salt-bridge network. On the basis of their proximity to the substrate's reaction participants, the imidazole of an Asp99-His136 dyad from one subunit, the side chains of the Asp41, Cys66, and Glu174 residues from the other subunit, and Mg(2+)-activated water molecules are proposed to serve specific roles in the catalytic cycle as general acid-base functionalities. The model suggests that during the 1,2-shift step of the reaction, the substrate's C3 and C4 hydroxyl groups are cis to each other. A cis transition state is calculated to have an activation barrier that is 2 kcal/mol greater than that of the trans transition state in the absence of the enzyme.

  • Organizational Affiliation

    Experimental Station, DuPont Central Research and Development, Wilmington, Delaware 19880, USA. der-ing.liao@usa.dupont.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
3,4-Dihydroxy-2-Butanone 4-Phosphate Synthase233Pyricularia griseaMutation(s): 0 
Gene Names: rice blast fungi
EC: 5.4.99
Find proteins for Q8TG90 (Pyricularia oryzae (strain 70-15 / ATCC MYA-4617 / FGSC 8958))
Explore Q8TG90 
Go to UniProtKB:  Q8TG90
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8TG90
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 0.98 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.178 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.889α = 90
b = 88.147β = 90
c = 43.995γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-03-06
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2023-08-16
    Changes: Data collection, Database references, Derived calculations, Refinement description