Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 43579.87 
• Atom Count: 3012 
• Residue Count: 372 
• Unique protein chains: 1

2DHF

CRYSTAL STRUCTURES OF RECOMBINANT HUMAN DIHYDROFOLATE REDUCTASE COMPLEXED WITH FOLATE AND 5-DEAZOFOLATE

• DOI: 10.2210/pdb2DHF/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Homo sapiens


• Deposited: 1989-10-25 Released: 1990-07-15 
• Deposition Author(s): Davies /II, J.F., Kraut, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.3 Å

Literature

Crystal structures of recombinant human dihydrofolate reductase complexed with folate and 5-deazafolate.

Davies 2nd., J.F., Delcamp, T.J., Prendergast, N.J., Ashford, V.A., Freisheim, J.H., Kraut, J.

(1990) Biochemistry 29: 9467-9479

• PubMed: 2248959 
• Primary Citation of Related Structures:  
  1DHF


• PubMed Abstract: 
  

The 2.3-A crystal structure of recombinant human dihydrofolate reductase (EC 1.5.1.3, DHFR) has been solved as a binary complex with folate (a poor substrate at neutral pH) and also as a binary complex with an inhibitor, 5-deazafolate. The inhibitor appears to be protonated at N8 on binding, whereas folate is not. Rotation of the peptide plane joining I7 and V8 from its position in the folate complex permits hydrogen bonding of 5-deazafolate's protonated N8 to the backbone carbonyl of I7, thus contributing to the enzyme's greater affinity for 5-deazafolate than for folate. In this respect it is likely that bound 5-deazafolate furnishes a model for 7,8-dihydrofolate binding and, in addition, resembles the transition state for folate reduction. A hypothetical transition-state model for folate reduction, generated by superposition of the DHFR binary complexes human.5-deazafolate and chicken liver.NADPH, reveals a 1-A overlap of the binding sites for folate's pteridine ring and the dihydronicotinamide ring of NADPH. It is proposed that this binding-site overlap accelerates the reduction of both folate and 7,8-dihydrofolate by simultaneously binding substrate and cofactor with a sub van der Waals separation that is optimal for hydride transfer.

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Related Citations: 

• Expression and Site-Directed Mutagenesis of Human Dihydrofolate Reductase
  Prendergast, N.J.,Delcamp, T.J.,Smith, P.L.,Freisheim, J.H.
  (1988) Biochemistry 27: 3664




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Organizational Affiliation: 

Department of Chemistry, University of California, San Diego, La Jolla 92093.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
DIHYDROFOLATE REDUCTASE	A, B	186	Homo sapiens	Mutation(s): 0  Gene Names: DHFR EC: 1.5.1.3
Find proteins for P00374 (Homo sapiens) Go to Gene View: DHFR Go to UniProtKB:  P00374

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
DZF	A, B	5-DEAZAFOLIC ACID C20 H20 N6 O6 NFARHPAOOHOWAL-AWEZNQCLSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.3 Å
• Space Group: P 1

Unit Cell:

Length (Å)	Angle (°)
a = 36.100	α = 93.90
b = 38.500	β = 91.40
c = 76.800	γ = 111.50

Software Package:

Software Name	Purpose
PROLSQ	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1989-10-25 
• Released Date: 1990-07-15 
• Deposition Author(s): Davies /II, J.F., Kraut, J.

Revision History 

• Version 1.0: 1990-07-15
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2017-11-29
  Type: Derived calculations, Other, Structure summary