2W3V

MYCOBACTERIUM AVIUM DIHYDROFOLATE REDUCTASE COMPLEXED WITH NADPH AND TRIMETHOPRIM


X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
experimental modelPDB 1RX1PDB ENTRY 1RX1

Crystallization

Crystalization Experiments
IDMethodpHTemperatureDetails
1VAPOR DIFFUSION, HANGING DROP6.5277MAVDHFR (15 MG/ML) IN 20 MM HEPES (PH 7.0), 1 MM DTT, 0.1 MM EDTA, 1.5 MM NAN3 WAS MIXED WITH NADPH (3 MM, 15 MIN AT ROOM TEMPERATURE) AND THEN TRIMETHOPRIM (2 MM, 15 MIN ON ICE). CRYSTALLIZATION (HANGING DROP VAPOR PHASE EQUILIBRATION) WAS ACHIEVED BY MIXING WITH AN EQUAL VOLUME OF THE PROTEIN COMPLEX WITH A RESERVOIR SOLUTION CONSISTING OF 70% 2-METHYL-2, 4-PENTANEDIOL (MPD) AND 100 MM HEPES (PH 6.5), AND SUSPENDING THE MIXTURE OVER THE RESERVOIR AT 277 K. SMALL ROD-LIKE CRYSTALS (0.01 X 0.01 X 0.05 MM) GREW WITHIN 2 DAYS. CRYSTALS WERE FLASH-COOLED DIRECTLY FROM THE DROP IN LIQUID N2.
Crystal Properties
Matthews coefficientSolvent content
2.550.9

Crystal Data

Unit Cell
Length ( Å )Angle ( ˚ )
a = 70.816α = 90
b = 70.816β = 90
c = 73.613γ = 90
Symmetry
Space GroupP 41 21 2

Diffraction

Diffraction Experiment
ID #Crystal IDScattering TypeData Collection TemperatureDetectorDetector TypeDetailsCollection DateMonochromatorProtocol
11x-ray100IMAGE PLATEMARRESEARCHMIRRORS2000-01-20MSINGLE WAVELENGTH
Radiation Source
ID #SourceTypeWavelength ListSynchrotron SiteBeamline
1SYNCHROTRONSSRL BEAMLINE BL9-10.785SSRLBL9-1

Data Collection

Overall
ID #Resolution (High)Resolution (Low)Percent Possible (Observed)R Merge I (Observed)Net I Over Average Sigma (I)RedundancyNumber Reflections (All)Number Reflections (Observed)Observed Criterion Sigma (F)Observed Criterion Sigma (I)B (Isotropic) From Wilson Plot
11.891598.20.0711.24.615319-1024.8
Highest Resolution Shell
ID #Resolution (High)Resolution (Low)Percent Possible (All)Percent Possible (Observed)R Merge I (Observed)Mean I Over Sigma (Observed)RedundancyNumber Unique Reflections (All)
11.891.9590.50.542.74.1

Refinement

Statistics
Diffraction IDStructure Solution MethodCross Validation methodStarting modelResolution (High)Resolution (Low)Number Reflections (Observed)Number Reflections (R-Free)Percent Reflections (Observed)R-Factor (Observed)R-Work (Depositor)R-Work (DCC)R-Free (Depositor)R-Free (DCC)R-Free Selection DetailsMean Isotropic B
X-RAY DIFFRACTIONMOLECULAR REPLACEMENTTHROUGHOUTPDB ENTRY 1RX11.8914.831452977398.30.1820.180.180.2240.22RANDOM29.52
Temperature Factor Modeling
Anisotropic B[1][1]Anisotropic B[1][2]Anisotropic B[1][3]Anisotropic B[2][2]Anisotropic B[2][3]Anisotropic B[3][3]
1.171.17-2.33
RMS Deviations
KeyRefinement Restraint Deviation
r_dihedral_angle_2_deg29.172
r_dihedral_angle_4_deg16.73
r_dihedral_angle_3_deg12.153
r_dihedral_angle_1_deg5.902
r_scangle_it3.31
r_scbond_it2.274
r_angle_refined_deg1.553
r_mcangle_it1.395
r_mcbond_it0.904
r_nbtor_refined0.31
Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen AtomsNumber
Protein Atoms1276
Nucleic Acid Atoms
Solvent Atoms160
Heterogen Atoms69

Software

Software
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing