1CX9

CRYSTAL STRUCTURE OF THE COMPLEX OF BACTERIAL TRYPTOPHAN SYNTHASE WITH THE TRANSITION STATE ANALOGUE INHIBITOR 4-(2-AMINOPHENYLTHIO)-BUTYLPHOSPHONIC ACID


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.219 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystallographic studies of phosphonate-based alpha-reaction transition-state analogues complexed to tryptophan synthase.

Sachpatzidis, A.Dealwis, C.Lubetsky, J.B.Liang, P.H.Anderson, K.S.Lolis, E.

(1999) Biochemistry 38: 12665-12674

  • DOI: 10.1021/bi9907734
  • Primary Citation of Related Structures:  
    1C8V, 1C9D, 1CW2, 1CX9, 1C29

  • PubMed Abstract: 
  • In an effort to use a structure-based approach for the design of new herbicides, the crystal structures of complexes of tryptophan synthase with a series of phosphonate enzyme inhibitors were determined at 2.3 A or higher resolution. These inhibitors were designed to mimic the transition state formed during the alpha-reaction of the enzyme and, as expected, have affinities much greater than that of the natural substrate indole-3-glycerol phosphate or its nonhydrolyzable analogue indole propanol phosphate (IPP) ...

    In an effort to use a structure-based approach for the design of new herbicides, the crystal structures of complexes of tryptophan synthase with a series of phosphonate enzyme inhibitors were determined at 2.3 A or higher resolution. These inhibitors were designed to mimic the transition state formed during the alpha-reaction of the enzyme and, as expected, have affinities much greater than that of the natural substrate indole-3-glycerol phosphate or its nonhydrolyzable analogue indole propanol phosphate (IPP). These inhibitors are ortho-substituted arylthioalkylphosphonate derivatives that have an sp(3)-hybridized sulfur atom, designed to mimic the putative tetrahedral transition state at the C3 atom of the indole, and lack the C2 atom to allow for higher conformational flexibility. Overall, the inhibitors bind in a fashion similar to that of IPP. Glu-49 and Phe-212 are the two active site residues whose conformation changes upon inhibitor binding. A very short hydrogen bond between a phosphonate oxygen and the Ser-235 hydroxyl oxygen may be responsible for stabilization of the enzyme-inhibitor complexes. Implications for the mechanism of catalysis as well as directions for more potent inhibitors are discussed.


    Related Citations: 
    • Three-Dimensional Structure of the Tryptophan Synthase Alpha 2 Beta 2 Multienzyme Complex from Salmonella typhimurium
      Hyde, C.C., Ahmed, S.A., Padlan, E.A., Miles, E.W., Davies, D.R.
      (1988) J Biol Chem 263: 17857
    • Loop Closure and Intersubunit Communication in Tryptophan Synthase
      Schneider, T.R., Gerhardt, E., Lee, M., Anderson, K.S., Schlichting, I.
      (1998) Biochemistry 37: 5394

    Organizational Affiliation

    Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut 06520, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TRYPTOPHAN SYNTHASE (ALPHA CHAIN)A268Salmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 0 
EC: 4.2.1.20
UniProt
Find proteins for P00929 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P00929 
Go to UniProtKB:  P00929
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
TRYPTOPHAN SYNTHASE (BETA CHAIN)B397Salmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 0 
EC: 4.2.1.20
UniProt
Find proteins for P0A2K1 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P0A2K1 
Go to UniProtKB:  P0A2K1
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NHP
Query on NHP

Download Ideal Coordinates CCD File 
C [auth A]4-(2-AMINOPHENYLTHIO)-BUTYLPHOSPHONIC ACID
C10 H16 N O3 P S
POZPBCXLYRZUTO-UHFFFAOYSA-N
 Ligand Interaction
PLP
Query on PLP

Download Ideal Coordinates CCD File 
E [auth B]PYRIDOXAL-5'-PHOSPHATE
C8 H10 N O6 P
NGVDGCNFYWLIFO-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

Download Ideal Coordinates CCD File 
D [auth B]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
NHPIC50:  178   nM  Binding MOAD
NHPIC50 :  178   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.219 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 182.65α = 90
b = 59.34β = 94.5
c = 67.3γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
CCP4data scaling
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-12-29
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance