1G7U

CRYSTAL STRUCTURES OF KDO8P SYNTHASE IN ITS BINARY COMPLEX WITH SUBSTRATE PHOSPHOENOL PYRUVATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.228 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structures of KDOP synthase in its binary complexes with the substrate phosphoenolpyruvate and with a mechanism-based inhibitor.

Asojo, O.Friedman, J.Adir, N.Belakhov, V.Shoham, Y.Baasov, T.

(2001) Biochemistry 40: 6326-6334

  • Primary Citation of Related Structures:  1G7V

  • PubMed Abstract: 
  • The crystal structures of 3-deoxy-D-manno-2-octulosonate-8-phosphate synthase (KDOPS) from Escherichia coli complexed with the substrate phosphoenolpyruvate (PEP) and with a mechanism-based inhibitor (K(d) = 0.4 microM) were determined by molecular r ...

    The crystal structures of 3-deoxy-D-manno-2-octulosonate-8-phosphate synthase (KDOPS) from Escherichia coli complexed with the substrate phosphoenolpyruvate (PEP) and with a mechanism-based inhibitor (K(d) = 0.4 microM) were determined by molecular replacement using X-ray diffraction data to 2.8 and 2.3 A resolution, respectively. Both the KDOPS.PEP and KDOPS.inhibitor complexes crystallize in the cubic space group I23 with cell constants a = b = c = 117.9 and 117.6 A, respectively, and one subunit per asymmetric unit. The two structures are nearly identical, and superposition of their Calpha atoms indicates an rms difference of 0.41 A. The PEP in the KDOPS.PEP complex is anchored to the enzyme in a conformation that blocks its si face and leaves its re face largely devoid of contacts. This results from KDOPS's selective choice of a PEP conformer in which the phosphate group of PEP is extended toward the si face. Furthermore, the structure reveals that the bridging (P-O-C) oxygen atom and the carboxylate group of PEP are not strongly hydrogen-bonded to the enzyme. The resulting high degree of negative charge on the carboxylate group of PEP would then suggest that the condensation step between PEP and D-arabinose-5-phosphate (A5P) should proceed in a stepwise fashion through the intermediacy of a transient oxocarbenium ion at C2 of PEP. The molecular structural results are discussed in light of the chemically similar but mechanistically distinct reaction that is catalyzed by the enzyme 3-deoxy-D-arabino-2-heptulosonate-7-phosphate synthase and in light of the preferred enzyme-bound states of the substrate A5P.


    Organizational Affiliation

    Department of Chemistry, University of Houston, Houston, Texas 77204-5641, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
2-DEHYDRO-3-DEOXYPHOSPHOOCTONATE ALDOLASE
A
284Escherichia coli (strain K12)Gene Names: kdsA
EC: 2.5.1.55
Find proteins for P0A715 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A715
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PEP
Query on PEP

Download SDF File 
Download CCD File 
A
PHOSPHOENOLPYRUVATE
C3 H5 O6 P
DTBNBXWJWCWCIK-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.228 
  • Space Group: I 2 3
Unit Cell:
Length (Å)Angle (°)
a = 117.900α = 90.00
b = 117.900β = 90.00
c = 117.900γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
AMoREphasing
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-05-16
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance