1KFE

CRYSTAL STRUCTURE OF ALPHAT183V MUTANT OF TRYPTOPHAN SYNTHASE FROM SALMONELLA TYPHIMURIUM WITH L-Ser Bound To The Beta Site


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

On the Role of AlphaTHR183 in the Allosteric Regulation and Catalytic Mechanism of Tryptophan Synthase

Kulik, V.Weyand, M.Siedel, R.Niks, D.Arac, D.Dunn, M.F.Schlichting, I.

(2002) J.Mol.Biol. 324: 677-690

  • Primary Citation of Related Structures:  1K8X, 1KFB, 1KFC, 1KFJ, 1KFK
  • Also Cited By: 1XCF

  • PubMed Abstract: 
  • The catalytic activity and substrate channeling of the pyridoxal 5'-phosphate-dependent tryptophan synthase alpha(2)beta(2) complex is regulated by allosteric interactions that modulate the switching of the enzyme between open, low activity and close ...

    The catalytic activity and substrate channeling of the pyridoxal 5'-phosphate-dependent tryptophan synthase alpha(2)beta(2) complex is regulated by allosteric interactions that modulate the switching of the enzyme between open, low activity and closed, high activity states during the catalytic cycle. The highly conserved alphaThr183 residue is part of loop alphaL6 and is located next to the alpha-active site and forms part of the alpha-beta subunit interface. The role of the interactions of alphaThr183 in alpha-site catalysis and allosteric regulation was investigated by analyzing the kinetics and crystal structures of the isosteric mutant alphaThr183Val. The mutant displays strongly impaired allosteric alpha-beta communication, and the catalytic activity of the alpha-reaction is reduced one hundred fold, whereas the beta-activity is not affected. The structural work establishes that the basis for the missing inter-subunit signaling is the lack of loop alphaL6 closure even in the presence of the alpha-subunit ligands, 3-indolyl-D-glycerol 3'-phosphate, or 3-indolylpropanol 3'-phosphate. The structural basis for the reduced alpha-activity has its origins in the missing hydrogen bond between alphaThr183 and the catalytic residue, alphaAsp60.


    Organizational Affiliation

    Max Planck Institut für Molekulare Physiologie, Abeilung für Biophysikalische Chemie, Otto Hahn Str 11, 44227 Dortmund, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRYPTOPHAN SYNTHASE ALPHA CHAIN
A
268Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)Gene Names: trpA
EC: 4.2.1.20
Find proteins for P00929 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Go to UniProtKB:  P00929
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
TRYPTOPHAN SYNTHASE BETA CHAIN
B
394Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)Gene Names: trpB
EC: 4.2.1.20
Find proteins for P0A2K1 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Go to UniProtKB:  P0A2K1
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
PLS
Query on PLS

Download SDF File 
Download CCD File 
B
[3-HYDROXY-2-METHYL-5-PHOSPHONOOXYMETHYL-PYRIDIN-4-YLMETHYL]-SERINE
PYRIDOXYL-SERINE-5-MONOPHOSPHATE
C11 H17 N2 O8 P
ODVKKQWXKRZJLG-VIFPVBQESA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.192 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 182.224α = 90.00
b = 59.985β = 94.68
c = 67.072γ = 90.00
Software Package:
Software NamePurpose
MARdata collection
CNSphasing
XDSdata scaling
XDSdata reduction
MARdata reduction
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-01-07
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance