Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

Global Symmetry: Dihedral - D4  (3D View)
Global Stoichiometry: Homo 8-mer - A8 

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

Macromolecule Content

• Total Structure Weight: 17.99 kDa 
• Atom Count: 1380 
• Modelled Residue Count: 163 
• Deposited Residue Count: 169 
• Unique protein chains: 1

1QCZ

CRYSTAL STRUCTURE OF E. COLI PURE, AN UNUSUAL MUTASE THAT CATALYZES THE CONVERSION OF N5-CARBOXYAMINOIMIDAZOLE RIBONUCLEOTIDE (N5-CAIR) TO 4-CARBOXYAMINOIMIDAZOLE RIBONUCLEOTIDE (CAIR) IN THE PURINE BIOSYNTHETIC PATHWAY

• PDB DOI: 10.2210/pdb1QCZ/pdb

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


• Deposited: 1999-05-10 Released: 1999-11-10 
• Deposition Author(s): Ealick, S.E., Mathews, I.I.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 0.213 
• R-Value Work: 0.186 

Literature

Crystal structure of Escherichia coli PurE, an unusual mutase in the purine biosynthetic pathway.

Mathews, I.I., Kappock, T.J., Stubbe, J., Ealick, S.E.

(1999) Structure 7: 1395-1406

• PubMed: 10574791 
• DOI: 10.1016/s0969-2126(00)80029-5
• Primary Citation of Related Structures:  
  1D7A, 1QCZ


• PubMed Abstract: 
  

Conversion of 5-aminoimidazole ribonucleotide (AIR) to 4-carboxyaminoimidazole ribonucleotide (CAIR) in Escherichia coli requires two proteins - PurK and PurE. PurE has recently been shown to be a mutase that catalyzes the unusual rearrangement of N(5)-carboxyaminoimidazole ribonucleotide (N(5)-CAIR), the PurK reaction product, to CAIR. PurEs from higher eukaryotes are homologous to E. coli PurE, but use AIR and CO(2) as substrates to produce CAIR directly.

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Related Citations: 

• Evidence for the Direct Transfer of the Carboxylate of N5-Carboxyaminoimidazole Ribonucleotide (N5-CAIR) to Generate 4-Carboxy-5-Aminoimidazole Ribonucleotide Catalyzed by Escherichia coli purE, an N5-CAIR Mutase
  Meyer, E., Kappock, T.J., Osuji, C., Stubbe, J.
  (1999) Biochemistry 38: 3012

• Reactions Catalyzed by 5-Aminoimidazole Ribonucleotide Carboxylases from Escherichia coli Carboxylases from Escherichia coli and Gallus gallus: a Case for Divergent Catalytic Mechanisms
  Firestine, S.M., Poon, S.W., Mueller, E.J., Stubbe, J., Davisson, V.J.
  (1994) Biochemistry 33: 11927

• N5-Carboxyaminoimidazole Ribonucleotide: Evidence for a New Intermediate and Two New Enzymatic Activities in the de novo Purine Biosynthetic Pathway of Escherichia coli
  Mueller, E.J., Meyer, E., Rudolph, J., Davisson, V.J., Stubbe, J.
  (1994) Biochemistry 33: 2269

• Nucleotide Sequence Analysis of the purEK Operon Encoding 5'-Phosphoribosyl-5-Aminoimidazole Carboxylase of Escherichia coli K-12
  Tiedeman, A.A., Keyhani, J., Kamholz, J., 3D Daum, H.A., Gots, J.S., Smith, J.M.
  (1989) J Bacteriol 171: 205

• Identification and Sequence Analysis of Escherichia coli purE and purK Genes Encoding 5'-Phosphoribosyl-5-Amino-4-Imidazole Carboxylase for de novo Purine Biosynthesis
  Watanabe, W., Sampei, G., Aiba, A., Mizobuchi, K.
  (1989) J Bacteriol 171: 198

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Organizational Affiliation: 

Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
N5-CARBOXYAMINOIMIDAZOLE RIBONUCLEOTIDE MUTASE	A	169	Escherichia coli	Mutation(s): 4  EC: 4.1.1.21 (PDB Primary Data), 5.4.99.18 (UniProt)
UniProt
Find proteins for P0AG18 (Escherichia coli (strain K12)) Explore P0AG18  Go to UniProtKB:  P0AG18

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 0.213 
• R-Value Work: 0.186 
• Space Group: I 4 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 113.04	α = 90
b = 113.04	β = 90
c = 49.41	γ = 90

Software Package:

Software Name	Purpose
SHAKE	model building
SnB	phasing
X-PLOR	refinement
MOSFLM	data reduction
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-05-10 
• Released Date: 1999-11-10 
Deposition Author(s): Ealick, S.E., Mathews, I.I.

Revision History  

• Version 1.0: 1999-11-10
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2017-10-04
  Changes: Refinement description
• Version 1.4: 2018-01-31
  Changes: Experimental preparation