1A4I

HUMAN TETRAHYDROFOLATE DEHYDROGENASE / CYCLOHYDROLASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.199 

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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


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

  • DOI: https://doi.org/10.1016/s0969-2126(98)00019-7
  • Primary Citation of Related Structures:  
    1A4I

  • 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. We have determined, to 1.5 A resolution, the structure of a dimer of the D/C domain of the human trifunctional cytosolic enzyme with bound NADP cofactor, using the MAD technique. The D/C subunit is composed of two alpha/beta domains that assemble to form a wide cleft. The cleft walls are lined with highly conserved residues and NADP is bound along one wall. The NADP-binding domain has a Rossmann fold, characterized by a modified diphosphate-binding loop fingerprint-GXSXXXG. Dimerization occurs by antiparallel interaction of two NADP-binding domains. Superposition of the two subunits indicates domain motion occurs about a well-defined hinge region. Analysis of the structure suggests strongly that folate-binding sites for both activities are within the cleft, providing direct support for the proposed overlapping site model. The orientation of the nicotinamide ring suggests that in the dehydrogenase-catalyzed reaction hydride transfer occurs to the pro-R side of the ring. The identity of the cyclohydrolase active site is not obvious. We propose that a conserved motif-Tyr52-X-X-X-Lys56- and/or a Ser49-Gln100-Pro102 triplet have a role in this activity.


  • Organizational Affiliation

    Biotechnology Research Institute, Montréal, Québec, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
METHYLENETETRAHYDROFOLATE DEHYDROGENASE / METHENYLTETRAHYDROFOLATE CYCLOHYDROLASE
A, B
301Homo sapiensMutation(s): 0 
EC: 1.5.1.5 (PDB Primary Data), 3.5.4.9 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for P11586 (Homo sapiens)
Explore P11586 
Go to UniProtKB:  P11586
PHAROS:  P11586
GTEx:  ENSG00000100714 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP11586
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NDP
Query on NDP

Download Ideal Coordinates CCD File 
C [auth A],
D [auth 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: 1.50 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.199 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.523α = 90
b = 135.843β = 90
c = 61.403γ = 90
Software Package:
Software NamePurpose
MLPHAREphasing
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-02-09
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-07
    Changes: Data collection, Database references, Derived calculations