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_chiral_restr 0.134
p_plane_restr 0.0213
p_mcbond_it 2.579
p_xyhbond_nbd 0.15
p_singtor_nbd 0.177
p_scangle_it 7.067
p_staggered_tor 13.8
p_mcangle_it 3.809
p_scbond_it 5.098
p_planar_tor 3.6
p_bond_d 0.013
p_angle_d 0.034
p_planar_d 0.04
p_transverse_tor 46.5
p_multtor_nbd 0.271
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

Software
Software Name Purpose
REFMAC refinement
DENZO data reduction
SCALEPACK data scaling
MLPHARE phasing