Biological Assembly 1  

 3D View: Structure

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 31.08 kDa 
• Atom Count: 2234 
• Modelled Residue Count: 287 
• Deposited Residue Count: 288 
• Unique protein chains: 1

1B0A

5,10, METHYLENE-TETRAHYDROPHOLATE DEHYDROGENASE/CYCLOHYDROLASE FROM E COLI.

• DOI: 10.2210/pdb1B0A/pdb

• Classification: OXIDOREDUCTASE,HYDROLASE
• Organism(s): Escherichia coli K-12
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1998-11-06 Released: 1999-06-29 
• Deposition Author(s): Shen, B.W., Dyer, D., Huang, J.-Y., D'Ari, L., Rabinowitz, J., Stoddard, B.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.56 Å
• R-Value Free: 0.292 
• R-Value Work: 0.218 

Literature

The crystal structure of a bacterial, bifunctional 5,10 methylene-tetrahydrofolate dehydrogenase/cyclohydrolase.

Shen, B.W., Dyer, D.H., Huang, J.Y., D'Ari, L., Rabinowitz, J., Stoddard, B.L.

(1999) Protein Sci 8: 1342-1349

• PubMed: 10386884 
• DOI: 10.1110/ps.8.6.1342
• Primary Citation of Related Structures:  
  1B0A


• PubMed Abstract: 
  

The structure of a bifunctional 5,10-methylene-tetrahydrofolate dehydrogenase/cyclohydrolase from Escherichia coli has been determined at 2.5 A resolution in the absence of bound substrates and compared to the NADP-bound structure of the homologous enzyme domains from a trifunctional human synthetase enzyme. Superposition of these structures allows the identification of a highly conserved cluster of basic residues that are appropriately positioned to serve as a binding site for the poly-gamma-glutamyl tail of the tetrahydrofolate substrate. Modeling studies and molecular dynamic simulations of bound methylene-tetrahydrofolate and NADP shows that this binding site would allow interaction of the nicotinamide and pterin rings in the dehydrogenase active site. Comparison of these enzymes also indicates differences between their active sites that might allow the development of inhibitors specific to the bacterial target.

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Organizational Affiliation: 

Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (FOLD BIFUNCTIONAL PROTEIN)	A	288	Escherichia coli K-12	Mutation(s): 0  Gene Names: folD, ads, b0529, JW0518 EC: 1.5.1.5 (UniProt), 3.5.4.9 (UniProt)
Find proteins for P24186 (Escherichia coli (strain K12)) Explore P24186  Go to UniProtKB:  P24186

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.56 Å
• R-Value Free: 0.292 
• R-Value Work: 0.218 
• Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 64.52	α = 90
b = 84.95	β = 90
c = 146.14	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-11-06 
• Released Date: 1999-06-29 
Deposition Author(s): Shen, B.W., Dyer, D., Huang, J.-Y., D'Ari, L., Rabinowitz, J., Stoddard, B.L.

Revision History  

• Version 1.0: 1999-06-29
  Type: Initial release
  
• Version 1.1: 2008-04-26
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance