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- PDB-1rg7: DIHYDROFOLATE REDUCTASE COMPLEXED WITH METHOTREXATE -

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Basic information

Entry
Database: PDB / ID: 1rg7
TitleDIHYDROFOLATE REDUCTASE COMPLEXED WITH METHOTREXATE
ComponentsDIHYDROFOLATE REDUCTASE
KeywordsOXIDOREDUCTASE / NADP / TRIMETHOPRIM RESISTANCE / METHOTREXATE RESISTANCE / ONE-CARBON METABOLISM
Function / homology
Function and homology information


methotrexate binding / dihydrofolic acid binding / 10-formyltetrahydrofolate biosynthetic process / response to methotrexate / NADP+ binding / folic acid biosynthetic process / folic acid binding / dihydrofolate metabolic process / dihydrofolate reductase / dihydrofolate reductase activity ...methotrexate binding / dihydrofolic acid binding / 10-formyltetrahydrofolate biosynthetic process / response to methotrexate / NADP+ binding / folic acid biosynthetic process / folic acid binding / dihydrofolate metabolic process / dihydrofolate reductase / dihydrofolate reductase activity / folic acid metabolic process / NADPH binding / tetrahydrofolate biosynthetic process / one-carbon metabolic process / NADP binding / response to xenobiotic stimulus / response to antibiotic / cytosol
Similarity search - Function
Dihydrofolate reductase / Dihydrofolate Reductase, subunit A / Dihydrofolate Reductase, subunit A / Dihydrofolate reductase conserved site / Dihydrofolate reductase (DHFR) domain signature. / Dihydrofolate reductase (DHFR) domain profile. / Dihydrofolate reductase domain / Dihydrofolate reductase / Dihydrofolate reductase-like domain superfamily / 3-Layer(aba) Sandwich / Alpha Beta
Similarity search - Domain/homology
METHOTREXATE / Dihydrofolate reductase
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodX-RAY DIFFRACTION / MOLECULAR REPLACEMENT / Resolution: 2 Å
AuthorsSawaya, M.R. / Kraut, J.
Citation
Journal: Biochemistry / Year: 1997
Title: Loop and subdomain movements in the mechanism of Escherichia coli dihydrofolate reductase: crystallographic evidence.
Authors: Sawaya, M.R. / Kraut, J.
#1: Journal: Biochemistry / Year: 1995
Title: Isomorphous Crystal Structures of Escherichia Coli Dihydrofolate Reductase Complexed with Folate, 5-Deazafolate, and 5,10-Dideazatetrahydrofolate: Mechanistic Implications
Authors: Reyes, V.M. / Sawaya, M.R. / Brown, K.A. / Kraut, J.
#2: Journal: Biochemistry / Year: 1991
Title: Crystal Structure of Unliganded Escherichia Coli Dihydrofolate Reductase. Ligand-Induced Conformational Changes and Cooperativity in Binding
Authors: Bystroff, C. / Kraut, J.
#3: Journal: Biochemistry / Year: 1990
Title: Crystal Structures of Escherichia Coli Dihydrofolate Reductase: The Nadp+ Holoenzyme and the Folate.Nadp+ Ternary Complex. Substrate Binding and a Model for the Transition State
Authors: Bystroff, C. / Oatley, S.J. / Kraut, J.
History
DepositionNov 27, 1996Processing site: BNL
Revision 1.0Mar 12, 1997Provider: repository / Type: Initial release
Revision 1.1Mar 24, 2008Group: Version format compliance
Revision 1.2Jul 13, 2011Group: Version format compliance
Revision 1.3Aug 9, 2023Group: Database references / Derived calculations / Refinement description
Category: database_2 / pdbx_initial_refinement_model ...database_2 / pdbx_initial_refinement_model / struct_ref_seq_dif / struct_site
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _struct_ref_seq_dif.details / _struct_site.pdbx_auth_asym_id / _struct_site.pdbx_auth_comp_id / _struct_site.pdbx_auth_seq_id
Revision 1.4May 22, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: DIHYDROFOLATE REDUCTASE
hetero molecules


Theoretical massNumber of molelcules
Total (without water)18,4752
Polymers18,0201
Non-polymers4541
Water1,51384
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Unit cell
Length a, b, c (Å)37.036, 62.561, 65.630
Angle α, β, γ (deg.)90.00, 90.00, 90.00
Int Tables number19
Space group name H-MP212121

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Components

#1: Protein DIHYDROFOLATE REDUCTASE / DHFR


Mass: 18020.326 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Strain: RT500 / Plasmid: PRWA-1 / Production host: Escherichia coli (E. coli) / References: UniProt: P0ABQ4, dihydrofolate reductase
#2: Chemical ChemComp-MTX / METHOTREXATE


Mass: 454.439 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C20H22N8O5
#3: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 84 / Source method: isolated from a natural source / Formula: H2O

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Experimental details

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Experiment

ExperimentMethod: X-RAY DIFFRACTION / Number of used crystals: 1

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Sample preparation

CrystalDensity Matthews: 2.11 Å3/Da / Density % sol: 41.7 %
Crystal growpH: 7.2 / Details: pH 7.2
Crystal grow
*PLUS
Method: macro seeding
Components of the solutions
*PLUS
IDConc.Common nameCrystal-IDSol-IDChemical formula
120 mMimidazole1drop
225 %(w/v)PEG60001reservoir
350 mM1reservoirCaCl2
460 mMimidazole1reservoir

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Data collection

DiffractionMean temperature: 298 K
Diffraction sourceSource: ROTATING ANODE / Type: RIGAKU RUH2R / Wavelength: 1.5418
DetectorType: XUONG-HAMLIN MULTIWIRE / Detector: AREA DETECTOR / Date: Sep 23, 1992
RadiationMonochromator: GRAPHITE(002) / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1.5418 Å / Relative weight: 1
ReflectionResolution: 2→100 Å / Num. obs: 11593 / % possible obs: 96 % / Observed criterion σ(I): 0 / Redundancy: 3 % / Rsym value: 0.042 / Net I/σ(I): 10
Reflection shellResolution: 2→2.3 Å / Redundancy: 1.9 % / Mean I/σ(I) obs: 2.8 / Rsym value: 0.165 / % possible all: 96
Reflection
*PLUS
Num. measured all: 35093 / Rmerge(I) obs: 0.042
Reflection shell
*PLUS
% possible obs: 96 % / Rmerge(I) obs: 0.165

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Processing

Software
NameVersionClassification
MERLOTphasing
TNT5Drefinement
UCSDdata reduction
UCSDdata scaling
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: PDB ENTRY 1RA3

1ra3


Resolution: 2→20 Å / σ(F): 0 / Stereochemistry target values: TNT PROTGEO
RfactorNum. reflection% reflection
Rwork0.177 --
obs-11593 96 %
Solvent computationSolvent model: MOEWS AND KRETSINGER / Bsol: 339.4 Å2 / ksol: 0.869 e/Å3
Refinement stepCycle: LAST / Resolution: 2→20 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms1247 0 33 84 1364
Refine LS restraints
Refine-IDTypeDev idealNumberWeight
X-RAY DIFFRACTIONt_bond_d0.02213140.02
X-RAY DIFFRACTIONt_angle_deg317803
X-RAY DIFFRACTIONt_dihedral_angle_d24.2750
X-RAY DIFFRACTIONt_incorr_chiral_ct0
X-RAY DIFFRACTIONt_pseud_angle
X-RAY DIFFRACTIONt_trig_c_planes0.02370.02
X-RAY DIFFRACTIONt_gen_planes0.0081890.02
X-RAY DIFFRACTIONt_it5.713146
X-RAY DIFFRACTIONt_nbd0.024310.02
Software
*PLUS
Name: TNT / Version: 5-D / Classification: refinement
Refinement
*PLUS
Rfactor obs: 0.177
Solvent computation
*PLUS
Displacement parameters
*PLUS
Refine LS restraints
*PLUS
Type: t_plane_restr / Dev ideal: 0.008 / Weight: 0.02

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