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Crystal structure of a GCN4 leucine zipper mutant at 1.6 A resolution
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details in silico model Other 28-residue polyalanine alpha helix
Crystallization Crystalization Experiments ID Method pH Temperature Details 1 VAPOR DIFFUSION, HANGING DROP 4.5 298 Protein solution: 8 mg/mL Leucine zipper peptide, 0.1 M Sodium acetate pH 4.5. Reservoir solution: 0.2 M CaCl2, 0.1 M Sodium acetate pH 4.5, 20 % v/v Isopropanol, VAPOR DIFFUSION, HANGING DROP, temperature 298.0K
Crystal Properties Matthews coefficient Solvent content 2.06 40.19
Crystal Data Unit Cell Length ( Å ) Angle ( ˚ ) a = 31.145 α = 90 b = 31.145 β = 90 c = 57.324 γ = 120
Symmetry Space Group P 32 2 1
Diffraction Diffraction Experiment ID # Crystal ID Scattering Type Data Collection Temperature Detector Detector Type Details Collection Date Monochromator Protocol 1 1 x-ray 95 CCD ADSC QUANTUM 315 Pt-coated toroidal Si mirror for horizontal and vertical focusing followed by double flat Si crystal monochromator 2005-03-31 M SINGLE WAVELENGTH
Radiation Source ID # Source Type Wavelength List Synchrotron Site Beamline 1 SYNCHROTRON NSLS BEAMLINE X25 1.1000 NSLS X25
Data Collection Overall ID # Resolution (High) Resolution (Low) Percent Possible (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 1.6 19.64 85.9 0.059 20.7 3.2 7098 7098 29.4
Highest Resolution Shell ID # Resolution (High) Resolution (Low) Percent Possible (All) Percent Possible (Observed) R-Sym I (Observed) Mean I Over Sigma (Observed) Redundancy Number Unique Reflections (All) 1.6 1.66 23.6 0.24 2 1.3 194
Refinement Statistics Diffraction ID Structure Solution Method Cross Validation method Starting model Resolution (High) Resolution (Low) Cut-off Sigma (F) Number Reflections (Observed) Number Reflections (R-Free) Percent Reflections (Observed) R-Factor (Observed) R-Work (Depositor) R-Work (DCC) R-Free (Depositor) R-Free (DCC) R-Free Selection Details Mean Isotropic B X-RAY DIFFRACTION MOLECULAR REPLACEMENT THROUGHOUT A STANDARD HELIX OF 28 POLYALANINE RESIDUES 1.6 19.64 2 4104 389 89.7 0.257 0.257 0.2506 0.287 0.2834 RANDOM 29.6
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] 1.73 1.73 -3.45
RMS Deviations Key Refinement Restraint Deviation c_dihedral_angle_d 15.7 c_scangle_it 3.86 c_scbond_it 2.49 c_mcangle_it 2.45 c_mcbond_it 1.65 c_angle_deg 0.9 c_improper_angle_d 0.59 c_bond_d 0.005 c_bond_d_na c_bond_d_prot
RMS Deviations Key Refinement Restraint Deviation c_dihedral_angle_d 15.7 c_scangle_it 3.86 c_scbond_it 2.49 c_mcangle_it 2.45 c_mcbond_it 1.65 c_angle_deg 0.9 c_improper_angle_d 0.59 c_bond_d 0.005 c_bond_d_na c_bond_d_prot c_angle_d c_angle_d_na c_angle_d_prot c_angle_deg_na c_angle_deg_prot c_dihedral_angle_d_na c_dihedral_angle_d_prot c_improper_angle_d_na c_improper_angle_d_prot
Non-Hydrogen Atoms Used in Refinement Non-Hydrogen Atoms Number Protein Atoms 283 Nucleic Acid Atoms Solvent Atoms 23 Heterogen Atoms
Software Software Software Name Purpose CBASS data collection MOLREP phasing CNS refinement HKL-2000 data reduction HKL-2000 data scaling