1G7U

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.231 

wwPDB Validation   3D Report Full Report


This is version 1.4 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

  • DOI: https://doi.org/10.1021/bi010339d
  • Primary Citation of Related Structures:  
    1G7U, 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 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
2-DEHYDRO-3-DEOXYPHOSPHOOCTONATE ALDOLASE284Escherichia coliMutation(s): 0 
EC: 4.1.2.16
UniProt
Find proteins for P0A715 (Escherichia coli (strain K12))
Explore P0A715 
Go to UniProtKB:  P0A715
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A715
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
PEP
Query on PEP

Download Ideal Coordinates CCD File 
B [auth A]PHOSPHOENOLPYRUVATE
C3 H5 O6 P
DTBNBXWJWCWCIK-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.231 
  • Space Group: I 2 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 117.9α = 90
b = 117.9β = 90
c = 117.9γ = 90
Software Package:
Software NamePurpose
AMoREphasing
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-05-16
    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: 2018-02-07
    Changes: Advisory, Experimental preparation
  • Version 1.4: 2024-02-07
    Changes: Advisory, Data collection, Database references, Derived calculations