Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 97.71 kDa 
• Atom Count: 7186 
• Modelled Residue Count: 865 
• Deposited Residue Count: 886 
• Unique protein chains: 1

3UJE

Asymmetric complex of human neuron specific enolase-3-PGA/PEP

• DOI: 10.2210/pdb3UJE/pdb

• Classification: LYASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2011-11-07 Released: 2012-08-22 
• Deposition Author(s): Qin, J., Chai, G., Brewer, J., Lovelace, L., Lebioda, L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.191 
• R-Value Work: 0.146 
• R-Value Observed: 0.148 

Literature

Structures of asymmetric complexes of human neuron specific enolase with resolved substrate and product and an analogous complex with two inhibitors indicate subunit interaction and inhibitor cooperativity.

Qin, J., Chai, G., Brewer, J.M., Lovelace, L.L., Lebioda, L.

(2012) J Inorg Biochem 111: 187-194

• PubMed: 22437160 
• DOI: 10.1016/j.jinorgbio.2012.02.011
• Primary Citation of Related Structures:  
  3UCC, 3UCD, 3UJE, 3UJF, 3UJR, 3UJS


• PubMed Abstract: 
  

In the presence of magnesium, enolase catalyzes the dehydration of 2-phospho-d-glycerate (PGA) to phosphoenolpyruvate (PEP) in glycolysis and the reverse reaction in gluconeogensis at comparable rates. The structure of human neuron specific enolase (hNSE) crystals soaked in PGA showed that the enzyme is active in the crystals and produced PEP; conversely soaking in PEP produced PGA. Moreover, the hNSE dimer contains PGA bound in one subunit and PEP or a mixture of PEP and PGA in the other. Crystals soaked in a mixture of competitive inhibitors tartronate semialdehyde phosphate (TSP) and lactic acid phosphate (LAP) showed asymmetry with TSP binding in the same site as PGA and LAP in the PEP site. Kinetic studies showed that the inhibition of NSE by mixtures of TSP and LAP is stronger than predicted for independently acting inhibitors. This indicates that in some cases inhibition of homodimeric enzymes by mixtures of inhibitors ("heteroinhibition") may offer advantages over single inhibitors.

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Organizational Affiliation: 

Department of Chemistry & Biochemistry, University of South Carolina, Columbia, SC 29208, United States.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Gamma-enolase	A, B	443	Homo sapiens	Mutation(s): 0  Gene Names: ENO2 EC: 4.2.1.11
Find proteins for P09104 (Homo sapiens) Explore P09104  Go to UniProtKB:  P09104
NIH Common Fund Data Resources
PHAROS:  P09104 GTEx:  ENSG00000111674

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
2PG	A	2-PHOSPHOGLYCERIC ACID C3 H7 O7 P GXIURPTVHJPJLF-UWTATZPHSA-N
PEP	B	PHOSPHOENOLPYRUVATE C3 H5 O6 P DTBNBXWJWCWCIK-UHFFFAOYSA-N
TRS	A	2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL C4 H12 N O3 LENZDBCJOHFCAS-UHFFFAOYSA-O
MG	A, B	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.191 
• R-Value Work: 0.146 
• R-Value Observed: 0.148 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 109.602	α = 90
b = 119.726	β = 90
c = 68.04	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
REFMAC	refinement
PDB_EXTRACT	data extraction
SERGUI	data collection
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-11-07 
• Released Date: 2012-08-22 
Deposition Author(s): Qin, J., Chai, G., Brewer, J., Lovelace, L., Lebioda, L.

Revision History  

• Version 1.0: 2012-08-22
  Type: Initial release
  
• Version 1.1: 2017-11-08
  Changes: Refinement description