1A4I Oxidoreductase date Jan 30, 1998
title Human Tetrahydrofolate Dehydrogenase Cyclohydrolase
authors M.Allaire, Y.Li, R.E.Mackenzie, M.Cygler
compound source
Molecule: Methylenetetrahydrofolate Dehydrogenase Methenyltetrahydrofolate Cyclohydrolase;
Chain: A, B
Synonym: Methylenethf Dehydrogenase Methenylthf Cyclohydrolase;
Engineered: Yes
Organism_scientific: Homo Sapiens
Organism_common: Human
Organism_taxid: 9606
Cellular_location: Cytoplasm
Expression_system: Escherichia Coli
Expression_system_taxid: 562
symmetry Space Group: P 21 21 21
R_factor 0.199 R_Free 0.235
length a length b length c angle alpha angle beta angle gamma
67.523 135.843 61.403 90.00 90.00 90.00
method X-Ray Diffractionresolution 1.50 Å
ligand NDP enzyme Oxidoreductase E.C. BRENDA
related structures by homologous chain: 1DIG
A, B

Primary referenceThe 3-D structure of a folate-dependent dehydrogenase/cyclohydrolase bifunctional enzyme at 1.5 A resolution., Allaire M, Li Y, MacKenzie RE, Cygler M, Structure 1998 Feb 15;6(2):173-82. PMID:9519408
Data retrieval
  • Asymmetric unit, PDB entry: [header only] [complete with coordinates] (103 Kb) [Save to disk]
  • Biological Unit Coordinates (1a4i.pdb1.gz) 98 Kb
  • LPC: Ligand-Protein Contacts for 1A4I
  • CSU: Contacts of Structural Units for 1A4I
  • Likely Quarternary Molecular Structure file(s) for 1A4I
  • Structure Factors (560 Kb)
  • Retrieve 1A4I in mmCIF format [Save to disk]
  • SEQRES to COORDINATES correlation for 1A4I from S2C, [Save to disk]
  • Re-refined 1a4i structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models
  • View 1A4I in 3D
  • Proteopedia, because life has more than 2D.
  • On Jmol, a nice Rasmol like molecule viewer. This is good for easiest viewing of basic structure.
  • On FirstGlance, an excellent tool for a guided tour on the structure components, by E. Martz.
  • Visual 3D analysis of 1A4I
  • Cartoon representation from PDB Cartoon
  • Ramachandran plot from PDBSum
  • Structure-derived information
  • Conformational Epitope Prediction for 1A4I 1A4IA 1A4IB from the CEP Server.
  • Electron Density related parameters from EDS Electron Density Server, at Upsala
  • Dipole moment, from Dipole Server at Weizmann Institute
  • Crystal Contacts, from CryCo at Weizmann Institute
  • 3D motif for 1A4I, from MSDmotif at EBI
  • Classification of representative domains in scop (Structural Classification of Proteins)
        - Domain d1a4ia1, region A:127-296 [Jmol] [rasmolscript] [script source]
        - Domain d1a4ia2, region A:2-126 [Jmol] [rasmolscript] [script source]
        - Domain d1a4ib1, region B:127-296 [Jmol] [rasmolscript] [script source]
        - Domain d1a4ib2, region B:2-126 [Jmol] [rasmolscript] [script source]
  • Fold representative 1a4i from FSSP and Dali (Families of Structurally Similar Proteins)
  • Class (fold), Architecture (subfold), Topology, Homologous superfamily from CATH
  • Summaries and structural analyses of PDB data files from PDBSum
  • Identification of Protein Pockets & Cavities at CASTp
  • Sequence-derived information
  • View one-letter amino acid or nucleotide sequence for each chain: [1a4i_B] [1a4i] [1a4i_A]
  • SWISS-PROT database: [P11586]
  • Domain organization of [C1TC_HUMAN] by SWISSPFAM
  • Other resources with information on 1A4I
  • Community annotation for 1A4I at PDBWiki (http://pdbwiki.org)
  • MMDB (Entrez's Structure Database)
  • Movements, Movies and Images
  • Images from IMB Jena Image Library of Biological Macromolecules.

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