4XUG

Crystal structure of Tryptophan Synthase from Salmonella typhimurium in complex with 2-({[4-(Trifluoromethoxy)Phenyl]Sulfonyl}Amino)Ethyl Dihydrogen Phosphate (F9F) inhibitor in the alpha site and ammonium ion in the metal coordination site.

• PDB DOI: https://doi.org/10.2210/pdb4XUG/pdb

• Classification: LYASE/LYASE INHIBITOR
• Organism(s): Salmonella enterica subsp. enterica serovar Typhimurium
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2015-01-25 Released: 2016-01-27 
• Deposition Author(s): Hilario, E., Caulkins, B.G., Young, R.P., Niks, D., Dunn, M.F., Mueller, L.J., Fan, L.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free: 0.194 
• R-Value Work: 0.165 
• R-Value Observed: 0.166 

Starting Model: experimental

Literature

Crystal structure of Tryptophan Synthase from Salmonella typhimurium in complex with 2-({[4-(Trifluoromethoxy)Phenyl]Sulfonyl}Amino)Ethyl Dihydrogen Phosphate (F9F) inhibitor in the alpha site and ammonium ion in the metal coordination site.

Hilario, E., Caulkins, B.G., Young, R.P., Niks, D., Dunn, M.F., Mueller, L.J., Fan, L.

To be published.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 72.31 kDa 
• Atom Count: 5,916 
• Modelled Residue Count: 661 
• Deposited Residue Count: 665 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Tryptophan synthase alpha chain	A	268	Salmonella enterica subsp. enterica serovar Typhimurium	Mutation(s): 0  Gene Names: trpA EC: 4.2.1.20
UniProt
Find proteins for P00929 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore P00929  Go to UniProtKB:  P00929

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Tryptophan synthase beta chain	B	397	Salmonella enterica subsp. enterica serovar Typhimurium	Mutation(s): 0  Gene Names: trpB EC: 4.2.1.20
UniProt
Find proteins for P0A2K1 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore P0A2K1  Go to UniProtKB:  P0A2K1

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
F9F	C [auth A]	2-({[4-(TRIFLUOROMETHOXY)PHENYL]SULFONYL}AMINO)ETHYL DIHYDROGEN PHOSPHATE C9 H11 F3 N O7 P S JDDKDMFCTOZVCJ-UHFFFAOYSA-N
PLP	D [auth B]	PYRIDOXAL-5'-PHOSPHATE C8 H10 N O6 P NGVDGCNFYWLIFO-UHFFFAOYSA-N
EDO	F [auth B]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N
NH4	E [auth B]	AMMONIUM ION H4 N QGZKDVFQNNGYKY-UHFFFAOYSA-O

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free: 0.194 
• R-Value Work: 0.165 
• R-Value Observed: 0.166 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 181.883	α = 90
b = 58.86	β = 94.67
c = 67.303	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
SCALA	data scaling
PHASER	phasing
PDB_EXTRACT	data extraction
MOSFLM	data reduction

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2016-01-27 
Deposition Author(s): Hilario, E., Caulkins, B.G., Young, R.P., Niks, D., Dunn, M.F., Mueller, L.J., Fan, L.

---

Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R01GM097569

Revision History  

• Version 1.0: 2016-01-27
  Type: Initial release
  
• Version 1.1: 2017-09-27
  Changes: Author supporting evidence, Derived calculations
• Version 1.2: 2019-12-25
  Changes: Author supporting evidence
• Version 1.3: 2023-09-27
  Changes: Data collection, Database references, Refinement description