1H9K

TWO CRYSTAL STRUCTURES OF THE CYTOPLASMIC MOLYBDATE-BINDING PROTEIN MODG SUGGEST A NOVEL COOPERATIVE BINDING MECHANISM AND PROVIDE INSIGHTS INTO LIGAND-BINDING SPECIFICITY. PHOSPHATE-GROWN FORM WITH TUNGSTATE AND PHOSPHATE BOUND


X-RAY DIFFRACTION Experimental Data & Validation


X-ray Experimental Help

Crystallization

Crystalization Experiments
pH 8.5
Details VAPOUR DIFFUSION. 75% SATURATED KH2PO4 IN 100MM TRIS-HCL PH8.5 WITH 2MM NA2WO4., pH 8.50

Crystal Data

Unit Cell
Length (Å) Angle (°)
a = 50.69 α = 90
b = 50.69 β = 90
c = 79.11 γ = 120
Symmetry
Space Group P 3 2 1

Diffraction

Diffraction Experiment
ID # Data Collection Temperature
1 100
Diffraction Detector
Detector Diffraction Type Details Collection Date
CCD MARRESEARCH -- 1998-04-15
Diffraction Radiation
Monochromator Protocol
-- SINGLE WAVELENGTH
Diffraction Detector Source
Source Type Wavelength List Synchrotron Site Beamline
SYNCHROTRON ESRF BEAMLINE ID14-3 -- ESRF ID14-3

Data Collection

Overall
Resolution (High) Resolution (Low) Percent Possible (Observed) R Merge I (Observed) R Sym I (Observed) Net I Over Average Sigma (I) Redundancy Number Reflections (All) Number Reflections (Observed) Observed Criterion Sigma (F) Observed Criterion Sigma (I) B (Isotropic) From Wilson Plot
1.8 44 98.9 0.088 -- -- 9.5 -- 10860 -- -3.0 17.4
High Resolution Shell
Resolution (High) Resolution (Low) Percent Possible (All) R Merge I (Observed) R-Sym I (Observed) Mean I Over Sigma (Observed) Redundancy Number Unique Reflections (All)
1.8 1.9 95.6 0.224 -- 2.7 7.1 --

Refinement

Statistics
Structure Solution Method Refinement High Resolution Refinement Low Resolution Cut-off Sigma (I) Cut-off Sigma (F) Number of Reflections (All) Number of Reflections (Observed) Number of Reflections (R-Free) Percent Reflections (Observed) R-Factor (All) R-Factor (Observed) R-Work R-Free R-Free Selection Details
MAD 1.8 40.0 -- 0.0 -- 10860 538 98.9 -- -- 0.186 0.227 RANDOM
Temperature Factor Modeling
Temperature Factor Value
Mean Isotropic B 19.0
RMS Deviations
Key Refinement Restraint Deviation
p_transverse_tor 46.5
p_staggered_tor 13.8
p_planar_tor 3.6
p_xyhbond_nbd 0.15
p_multtor_nbd 0.271
p_bond_d 0.013
p_angle_d 0.034
p_planar_d 0.04
p_mcbond_it 2.579
p_mcangle_it 3.809
p_scbond_it 5.098
p_scangle_it 7.067
p_plane_restr 0.0213
p_chiral_restr 0.134
p_singtor_nbd 0.177
Number of Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms Numbers
Protein Atoms 994
Nucleic Acid Atoms 0
Heterogen Atoms 18
Solvent Atoms 61

Software

Computing
Computing Package Purpose
DENZO Data Reduction (intensity integration)
SCALEPACK Data Reduction (data scaling)
MLPHARE Structure Solution
REFMAC Structure Refinement
Software
Software Name Purpose
REFMAC refinement
MLPHARE model building