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- PDB-3ix9: Crystal structure of Streptococcus pneumoniae dihydrofolate reduc... -

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Basic information

Entry
Database: PDB / ID: 3ix9
TitleCrystal structure of Streptococcus pneumoniae dihydrofolate reductase - Sp9 mutant
ComponentsDihydrofolate reductase
KeywordsOXIDOREDUCTASE / Central beta sheet surrounded by 4 alpha helices
Function / homology
Function and homology information


dihydrofolate metabolic process / dihydrofolate reductase / dihydrofolate reductase activity / folic acid metabolic process / tetrahydrofolate biosynthetic process / one-carbon metabolic process / NADP binding / 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 / Chem-NDP / Dihydrofolate reductase / Dihydrofolate reductase
Similarity search - Component
Biological speciesStreptococcus pneumoniae (bacteria)
MethodX-RAY DIFFRACTION / MOLECULAR REPLACEMENT / Resolution: 1.95 Å
AuthorsYennawar, N.H.
CitationJournal: Biochemistry / Year: 2010
Title: Kinetic and structural characterization of dihydrofolate reductase from Streptococcus pneumoniae
Authors: Lee, J. / Yennawar, N.H. / Gam, J. / Benkovic, S.J.
History
DepositionSep 3, 2009Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 2, 2010Provider: repository / Type: Initial release
Revision 1.1Jul 13, 2011Group: Version format compliance
Revision 1.2Oct 13, 2021Group: Database references / Derived calculations / Category: database_2 / 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 1.3Sep 6, 2023Group: Data collection / Refinement description
Category: chem_comp_atom / chem_comp_bond / pdbx_initial_refinement_model

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Dihydrofolate reductase
B: Dihydrofolate reductase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)46,8606
Polymers44,4612
Non-polymers2,4004
Water5,513306
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
2
A: Dihydrofolate reductase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)23,4303
Polymers22,2301
Non-polymers1,2002
Water181
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
MethodPISA
3
B: Dihydrofolate reductase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)23,4303
Polymers22,2301
Non-polymers1,2002
Water181
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
MethodPISA
Unit cell
Length a, b, c (Å)61.838, 93.639, 71.367
Angle α, β, γ (deg.)90.00, 90.00, 90.00
Int Tables number18
Space group name H-MP21212
Components on special symmetry positions
IDModelComponents
11A-209-

HOH

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Components

#1: Protein Dihydrofolate reductase


Mass: 22230.260 Da / Num. of mol.: 2 / Mutation: E54G, I63T, Q91S, L100V, E133A, A149T
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Streptococcus pneumoniae (bacteria) / Gene: dfr / Plasmid: pET28a / Production host: Escherichia coli (E. coli) / Strain (production host): ER2566, DthyDfol
References: UniProt: O85261, UniProt: Q54801*PLUS, dihydrofolate reductase
#2: Chemical ChemComp-NDP / NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE


Mass: 745.421 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C21H30N7O17P3
#3: Chemical ChemComp-MTX / METHOTREXATE


Mass: 454.439 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C20H22N8O5
#4: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 306 / 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: 2.32 Å3/Da / Density % sol: 47.07 %
Crystal growTemperature: 298 K / pH: 4
Details: 1M Lithium chloride, 0.1M Sodium citrate pH 4.0, 20% PEG 6000, VAPOR DIFFUSION, SITTING DROP, temperature 298K

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Data collection

DiffractionMean temperature: 93 K
Diffraction sourceSource: ROTATING ANODE / Type: RIGAKU MICROMAX-007 HF / Wavelength: 1.5418
DetectorType: RIGAKU SATURN 944+ / Detector: CCD / Date: Jul 15, 2008
RadiationProtocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1.5418 Å / Relative weight: 1
ReflectionResolution: 1.95→40 Å / Num. obs: 28610 / % possible obs: 92.6 % / Observed criterion σ(I): 3 / Redundancy: 2.34 % / Rmerge(I) obs: 0.102 / Net I/σ(I): 5.6
Reflection shellResolution: 1.95→2.02 Å / Redundancy: 1.41 % / Rmerge(I) obs: 0.21 / Mean I/σ(I) obs: 2.4 / % possible all: 92.6

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Processing

Software
NameVersionClassification
CrystalCleardata collection
PHASERphasing
CNS1.2refinement
CrystalCleardata reduction
CrystalCleardata scaling
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: PDB entry 1ZDR

1zdr


Resolution: 1.95→20 Å / σ(F): 0 / Stereochemistry target values: ENGH & HUBER
RfactorNum. reflection% reflectionSelection details
Rfree0.274 1424 4.6 %RANDOM
Rwork0.237 ---
obs0.237 28610 92.6 %-
all-28610 --
Solvent computationBsol: 74.38 Å2 / ksol: 0.45 e/Å3
Displacement parameters
Baniso -1Baniso -2Baniso -3
1-8.182 Å20 Å20 Å2
2---3.6 Å20 Å2
3----4.581 Å2
Refinement stepCycle: LAST / Resolution: 1.95→20 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms2750 0 162 306 3218
Refine LS restraints
Refine-IDTypeDev idealDev ideal target
X-RAY DIFFRACTIONc_bond_d0.01
X-RAY DIFFRACTIONc_bond_d_na
X-RAY DIFFRACTIONc_bond_d_prot
X-RAY DIFFRACTIONc_angle_d
X-RAY DIFFRACTIONc_angle_d_na
X-RAY DIFFRACTIONc_angle_d_prot
X-RAY DIFFRACTIONc_angle_deg1.52
X-RAY DIFFRACTIONc_angle_deg_na
X-RAY DIFFRACTIONc_angle_deg_prot
X-RAY DIFFRACTIONc_dihedral_angle_d
X-RAY DIFFRACTIONc_dihedral_angle_d_na
X-RAY DIFFRACTIONc_dihedral_angle_d_prot
X-RAY DIFFRACTIONc_improper_angle_d
X-RAY DIFFRACTIONc_improper_angle_d_na
X-RAY DIFFRACTIONc_improper_angle_d_prot
X-RAY DIFFRACTIONc_mcbond_it2.5211.5
X-RAY DIFFRACTIONc_mcangle_it3.2322
X-RAY DIFFRACTIONc_scbond_it3.5772
X-RAY DIFFRACTIONc_scangle_it4.4842.5

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