1NEJ

Crystalline Human Carbonmonoxy Hemoglobin S (Liganded Sickle Cell Hemoglobin) Exhibits The R2 Quaternary State At Neutral pH In The Presence Of Polyethylene Glycol: The 2.1 Angstrom Resolution Crystal Structure


X-RAY DIFFRACTION Experimental Data & Validation


X-ray Experimental Help

Crystallization

Crystalization Experiments
Method Vapor Diffusion Sitting Drop
pH 7.1
Temperature 298.0
Details 25% PEG 4000, 0.15M HEPES-Na,chloride anion traces; pH 7.1, VAPOR DIFFUSION, SITTING DROP, TEMPERATURE 298K

Crystal Data

Unit Cell
Length (Å) Angle (°)
a = 58 α = 90
b = 58.53 β = 90
c = 171.84 γ = 90
Symmetry
Space Group P 21 21 21

Diffraction

Diffraction Experiment
ID # Data Collection Temperature
1 100
Diffraction Detector
Detector Diffraction Type Details Collection Date
IMAGE PLATE RIGAKU RAXIS IV -- 2001-12-03
Diffraction Radiation
Monochromator Protocol
graphite SINGLE WAVELENGTH
Diffraction Detector Source
Source Type Wavelength List Synchrotron Site Beamline
ROTATING ANODE RIGAKU 1.5418 -- --

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
2.1 30 91.7 0.068 -- -- 17.0 32084 32084 -- 0.0 --
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)
2.1 2.18 64.7 0.355 -- 1.6 2.67 2240

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
MOLECULAR REPLACEMENT 2.1 8.0 -- 2.0 31433 28556 1456 83.27 -- -- 0.235 0.268 RANDOM
High Resolution Shell
Refinement method Shell Resolution (High) Shell Resolution (Low) # of Reflections (Observed) # of Reflections (R-Free) # of Reflections (R-Work) R-Factor (R-Work) R-Factor (R-Free) R-Factor (R-Free Error) Percent Reflections (Observed)
X Ray Diffraction 2.1 2.19 2026 100 -- 0.3821 0.4213 -- 45.89
X Ray Diffraction 2.19 2.31 2996 167 -- 0.3717 0.3905 -- 67.24
X Ray Diffraction 2.31 2.45 3417 185 -- 0.3838 0.4244 -- 75.87
X Ray Diffraction 2.45 2.63 3610 211 -- 0.3767 0.4095 -- 80.07
X Ray Diffraction 2.63 2.88 3754 191 -- 0.3527 0.3693 -- 83.52
X Ray Diffraction 2.88 3.28 4083 195 -- 0.2969 0.2989 -- 90.42
X Ray Diffraction 3.28 4.04 4241 195 -- 0.1987 0.2297 -- 93.64
X Ray Diffraction 4.04 8.0 4429 212 -- 0.1336 0.1682 -- 94.32
Temperature Factor Modeling
Temperature Factor Value
Isotropic Thermal Model Isotropic
Mean Isotropic B 53.0
Anisotropic B[1][1] -9.361
Anisotropic B[1][2] 0.0
Anisotropic B[1][3] 0.0
Anisotropic B[2][2] -0.179
Anisotropic B[2][3] 0.0
Anisotropic B[3][3] 9.54
RMS Deviations
Key Refinement Restraint Deviation
x_angle_deg 1.751
x_mcbond_it 1.5
x_bond_d 0.013
x_dihedral_angle_d 22.041
x_scangle_it 3.0
x_improper_angle_d 2.646
x_mcangle_it 2.5
x_scbond_it 2.0
Number of Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms Numbers
Protein Atoms 4380
Nucleic Acid Atoms 0
Heterogen Atoms 180
Solvent Atoms 233

Software

Software
Software Name Purpose
DENZO data reduction
SCALEPACK data scaling
X-PLOR model building
X-PLOR refinement version: 3.851
X-PLOR phasing