1H9J

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 MOLYBDATE 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 NA2MOO4., 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 98.7 0.045 -- -- 3.8 -- 10144 -- -3.0 19.3
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 98.1 0.092 -- 5.1 3.0 --

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 -- 10144 543 98.7 -- -- 0.2 0.266 RANDOM
Temperature Factor Modeling
Temperature Factor Value
Mean Isotropic B 22.0
RMS Deviations
Key Refinement Restraint Deviation
p_transverse_tor 44.8
p_staggered_tor 12.8
p_planar_tor 3.8
p_xyhbond_nbd 0.163
p_multtor_nbd 0.257
p_bond_d 0.013
p_angle_d 0.034
p_planar_d 0.037
p_mcbond_it 3.023
p_mcangle_it 3.754
p_scbond_it 5.173
p_scangle_it 6.732
p_plane_restr 0.0225
p_chiral_restr 0.128
p_singtor_nbd 0.175
Number of Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms Numbers
Protein Atoms 1004
Nucleic Acid Atoms 0
Heterogen Atoms 18
Solvent Atoms 77

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