Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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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: 66791.93 
• Atom Count: 4492 
• Residue Count: 602 
• Unique protein chains: 1

1A4I

HUMAN TETRAHYDROFOLATE DEHYDROGENASE / CYCLOHYDROLASE

• DOI: 10.2210/pdb1A4I/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 1998-01-30 Released: 1999-02-09 
• Deposition Author(s): Allaire, M., Li, Y., Mackenzie, R.E., Cygler, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.5 Å
• R-Value Free: 0.235 
• R-Value Work: 0.199 

Literature

The 3-D structure of a folate-dependent dehydrogenase/cyclohydrolase bifunctional enzyme at 1.5 A resolution.

Allaire, M., Li, Y., MacKenzie, R.E., Cygler, M.

(1998) Structure 6: 173-182

• PubMed: 9519408 


• PubMed Abstract: 
  

The interconversion of two major folate one-carbon donors occurs through the sequential activities of NAD(P)-dependent methylene[H4]folate dehydrogenase (D) and methenyl[H4]folate cyclohydrolase (C). These activities often coexist as part of a multifunctional enzyme and there are several lines of evidence suggesting that their substrates bind at overlapping sites. Little is known, however, about the nature of this site or the identity of the active-site residues for this enzyme family.

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Organizational Affiliation: 

Biotechnology Research Institute, Montréal, Québec, Canada.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
METHYLENETETRAHYDROFOLATE DEHYDROGENASE / METHENYLTETRAHYDROFOLATE CYCLOHYDROLASE	A, B	301	Homo sapiens	Mutation(s): 0  Gene Names: MTHFD1 (MTHFC, MTHFD)
Find proteins for P11586 (Homo sapiens) Go to Gene View: MTHFD1 Go to UniProtKB:  P11586

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
NDP	A, B	NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE C21 H30 N7 O17 P3 ACFIXJIJDZMPPO-NNYOXOHSSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.5 Å
• R-Value Free: 0.235 
• R-Value Work: 0.199 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 67.523	α = 90.00
b = 135.843	β = 90.00
c = 61.403	γ = 90.00

Software Package:

Software Name	Purpose
DENZO	data reduction
REFMAC	refinement
MLPHARE	phasing
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-01-30 
• Released Date: 1999-02-09 
• Deposition Author(s): Allaire, M., Li, Y., Mackenzie, R.E., Cygler, M.

Revision History 

• Version 1.0: 1999-02-09
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance