4MGP

Structure of racemic Ala-(8,13,18) Magainin 2


X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
IDMethodpHTemperatureDetails
1VAPOR DIFFUSION, HANGING DROP5.6298Precipitant solution contained 0.1 M sodium citrate tribasic, pH 5.6, and 35% v/v tert-butanol. No additional cryoprotectant was necessary for vitrification of crystals in LN2, VAPOR DIFFUSION, HANGING DROP, temperature 298K
Crystal Properties
Matthews coefficientSolvent content
2.1442.42

Crystal Data

Unit Cell
Length ( Å )Angle ( ˚ )
a = 53.38α = 89.97
b = 53.459β = 90.07
c = 29.75γ = 89.98
Symmetry
Space GroupI -4 2 d

Diffraction

Diffraction Experiment
ID #Crystal IDScattering TypeData Collection TemperatureDetectorDetector TypeDetailsCollection DateMonochromatorProtocol
11x-ray100CCDMARMOSAIC 300 mm CCD2013-06-23MSINGLE WAVELENGTH
Radiation Source
ID #SourceTypeWavelength ListSynchrotron SiteBeamline
1SYNCHROTRONAPS BEAMLINE 21-ID-G0.9786APS21-ID-G

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
11.7526.7295.40.09232.1722.4224726.4
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)
11.751.7964.30.3743.94.8

Refinement

Statistics
Diffraction IDStructure Solution MethodCross Validation methodStarting modelResolution (High)Resolution (Low)Number Reflections (All)Number Reflections (Observed)Number Reflections (R-Free)Percent Reflections (Observed)R-Factor (Observed)R-WorkR-FreeR-Free Selection DetailsMean Isotropic B
X-RAY DIFFRACTIONMOLECULAR REPLACEMENTTHROUGHOUTPDB entry 2MAG1.7526.69216921699595.420.19830.19650.2328RANDOM31.59
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]
-0.63-0.631.27
RMS Deviations
KeyRefinement Restraint Deviation
r_dihedral_angle_2_deg38.848
r_dihedral_angle_3_deg16.79
r_dihedral_angle_1_deg5.806
r_angle_refined_deg2.43
r_angle_other_deg1.189
r_chiral_restr0.165
r_bond_refined_d0.023
r_gen_planes_refined0.012
r_bond_other_d0.001
r_gen_planes_other0.001
Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen AtomsNumber
Protein Atoms163
Nucleic Acid Atoms
Solvent Atoms5
Heterogen Atoms

Software

Software
Software NamePurpose
XPREPdata reduction
REFMACrefinement
PDB_EXTRACTdata extraction
EMBLdata collection
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing