1ZT9

E. coli trp repressor, tetragonal crystal form

• PDB DOI: https://doi.org/10.2210/pdb1ZT9/pdb

• Classification: TRANSCRIPTION
• Organism(s): Escherichia coli
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2005-05-26 Released: 2006-05-09 
• Deposition Author(s): Lawson, C.L., Chin, A.S., Benoff, B., Yung, B.H.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.219 
• R-Value Work: 0.164 
• R-Value Observed: 0.167 

Literature

Two association modes for E. coli trp repressor dimer-dimer interactions

Lawson, C.L., Chin, A.S., Benoff, B., Yung, B.H.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

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

Biological Assembly 2  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 assigned by authors and generated by PISA (software)

Biological Assembly 3  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 3 generated by PISA (software)

Biological Assembly 4  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 4 generated by PISA (software)

Biological Assembly 5  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Homo 4-mer - A4 

Local Symmetry: Cyclic - C2  (Explore in 3D)
Local Stoichiometry: Homo 2-mer - A2 Local Symmetry: Cyclic - C2  (Explore in 3D)
Local Stoichiometry: Homo 2-mer - A2 

Biological assembly 5 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 50.54 kDa 
• Atom Count: 3,906 
• Modelled Residue Count: 404 
• Deposited Residue Count: 428 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Trp operon repressor	A, B, C [auth D], D [auth E]	107	Escherichia coli	Mutation(s): 0  Gene Names: trpR, rtrY
UniProt
Find proteins for P0A881 (Escherichia coli (strain K12)) Explore P0A881  Go to UniProtKB:  P0A881

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
TRP	G [auth A], J [auth B], M [auth D], P [auth E]	TRYPTOPHAN C11 H12 N2 O2 QIVBCDIJIAJPQS-VIFPVBQESA-N
SO4	E [auth A], F [auth A], H [auth B], I [auth B], K [auth D], L [auth D], N [auth E], O [auth E]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.219 
• R-Value Work: 0.164 
• R-Value Observed: 0.167 
• Space Group: P 4₃

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 81.348	α = 90
b = 81.348	β = 90
c = 72.687	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
CBASS	data collection

Structure Validation

Entry History 

Deposition Data

• Released Date: 2006-05-09 
Deposition Author(s): Lawson, C.L., Chin, A.S., Benoff, B., Yung, B.H.

Revision History  

• Version 1.0: 2006-05-09
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-10-11
  Changes: Refinement description
• Version 1.4: 2023-08-23
  Changes: Data collection, Database references, Derived calculations, Refinement description