Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 71601.47 
• Atom Count: 4880 
• Residue Count: 662 
• Unique protein chains: 2

1KFE

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

• DOI: 10.2210/pdb1KFE/pdb

• Classification: LYASE
• Organism(s): Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)
• Expression System: Escherichia coli
• Mutation(s): 1 


• Deposited: 2001-11-20 Released: 2003-01-07 
• Deposition Author(s): Kulik, V., Weyand, M., Siedel, R., Niks, D., Arac, D., Dunn, M.F., Schlichting, I.

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Experimental Data Snapshot

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

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

• PubMed: 12460570 
• Primary Citation of Related Structures:  
  1KFK, 1KFJ, 1KFC, 1KFB, 1K8X
• 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 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.

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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
Molecule	Chains	Sequence Length	Organism	Details
TRYPTOPHAN SYNTHASE ALPHA CHAIN	A	268	Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)	Mutation(s): 1  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
Molecule	Chains	Sequence Length	Organism	Details
TRYPTOPHAN SYNTHASE BETA CHAIN	B	394	Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)	Mutation(s): 0  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
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
NA	B	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N
PLS	B	[3-HYDROXY-2-METHYL-5-PHOSPHONOOXYMETHYL-PYRIDIN-4-YLMETHYL]-SERINE PYRIDOXYL-SERINE-5-MONOPHOSPHATE C11 H17 N2 O8 P ODVKKQWXKRZJLG-VIFPVBQESA-N

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 = 182.224	α = 90.00
b = 59.985	β = 94.68
c = 67.072	γ = 90.00

Software Package:

Software Name	Purpose
MAR	data collection
CNS	phasing
XDS	data scaling
XDS	data reduction
MAR	data reduction
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-11-20 
• Released Date: 2003-01-07 
• Deposition Author(s): Kulik, V., Weyand, M., Siedel, R., Niks, D., Arac, D., Dunn, M.F., Schlichting, I.

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