1I5O

CRYSTAL STRUCTURE OF MUTANT R105A OF E. COLI ASPARTATE TRANSCARBAMOYLASE

• PDB DOI: https://doi.org/10.2210/pdb1I5O/pdb

• Classification: TRANSFERASE
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2001-02-28 Released: 2001-05-02 
• Deposition Author(s): Macol, C.P., Tsuruta, H., Stec, B., Kantrowitz, E.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.212 
• R-Value Work: 0.155 
• R-Value Observed: 0.157 

Literature

Direct structural evidence for a concerted allosteric transition in Escherichia coli aspartate transcarbamoylase.

Macol, C.P., Tsuruta, H., Stec, B., Kantrowitz, E.R.

(2001) Nat Struct Biol 8: 423-426

• PubMed: 11323717 
• DOI: https://doi.org/10.1038/87582
• Primary Citation of Related Structures:  
  1I5O


• PubMed Abstract: 
  

  Regulation of protein function, often achieved by allosteric mechanisms, is central to normal physiology and cellular processes. Although numerous models have been proposed to account for the cooperative binding of ligands to allosteric proteins and enzymes, direct structural support has been lacking. Here, we used a combination of X-ray crystallography and small angle X-ray scattering in solution to provide direct structural evidence that the binding of ligand to just one of the six active sites of Escherichia coli aspartate transcarbamoylase induces a concerted structural transition from the T to the R state.

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Organizational Affiliation: 

Department of Chemistry, Boston College, Merkert Chemistry Center, Chestnut Hill, Massachusetts 02467, USA.

Biological Assembly 1  

Global Symmetry: Dihedral - D3  (Explore in 3D)
Global Stoichiometry: Hetero 12-mer - A6B6 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 103.18 kDa 
• Atom Count: 7,534 
• Modelled Residue Count: 926 
• Deposited Residue Count: 926 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ASPARTATE TRANSCARBAMOYLASE CATALYTIC CHAIN	A, C	310	Escherichia coli	Mutation(s): 1  Gene Names: PYRB, PYRI EC: 2.1.3.2
UniProt
Find proteins for P0A786 (Escherichia coli (strain K12)) Explore P0A786  Go to UniProtKB:  P0A786

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
ASPARTATE TRANSCARBAMOYLASE REGULATORY CHAIN	B, D	153	Escherichia coli	Mutation(s): 0  Gene Names: PYRB, PYRI
UniProt
Find proteins for P0A7F3 (Escherichia coli (strain K12)) Explore P0A7F3  Go to UniProtKB:  P0A7F3

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PAL	F [auth B]	N-(PHOSPHONACETYL)-L-ASPARTIC ACID C6 H10 N O8 P ZZKNRXZVGOYGJT-VKHMYHEASA-N
ZN	E [auth B], G [auth D]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.212 
• R-Value Work: 0.155 
• R-Value Observed: 0.157 
• Space Group: P 3 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 122.25	α = 90
b = 122.25	β = 90
c = 142.67	γ = 120

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
SDMS	data reduction
SDMS	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-05-02 
Deposition Author(s): Macol, C.P., Tsuruta, H., Stec, B., Kantrowitz, E.R.

Revision History  

• Version 1.0: 2001-05-02
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2021-10-27
  Changes: Database references, Derived calculations
• Version 1.4: 2023-08-09
  Changes: Data collection, Refinement description