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Structure of N15 Cro at 1.05 A: an ortholog of lambda Cro with a completely different but equally effective dimerization mechanism
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details in silico model Other 10-residue alpha helix
Crystallization Crystalization Experiments ID Method pH Temperature Details 1 VAPOR DIFFUSION, HANGING DROP 8.5 293 0.1 M Tris, 1.8 M ammonium sulfate, 17.5 mg/mL protein, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Crystal Properties Matthews coefficient Solvent content 1.76 30.34
Crystal Data Unit Cell Length ( Å ) Angle ( ˚ ) a = 25.579 α = 90 b = 49.512 β = 91.75 c = 43.768 γ = 90
Symmetry Space Group P 1 21 1
Diffraction Diffraction Experiment ID # Crystal ID Scattering Type Data Collection Temperature Detector Detector Type Details Collection Date Monochromator Protocol 1 1 x-ray 100 CCD MARMOSAIC 325 mm CCD flat collimating mirror
double crystal monochromator
toroid focusing mirror 2006-05-18 M SINGLE WAVELENGTH
Radiation Source ID # Source Type Wavelength List Synchrotron Site Beamline 1 SYNCHROTRON SSRL BEAMLINE BL9-2 0.9795 SSRL BL9-2
Data Collection Overall ID # Resolution (High) Resolution (Low) Percent Possible (Observed) R Merge 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 1.05 25.57 98 0.074 9.3 4.19 49888 49888 14.6
Highest Resolution Shell ID # Resolution (High) Resolution (Low) Percent Possible (All) Percent Possible (Observed) R Merge I (Observed) Mean I Over Sigma (Observed) Redundancy Number Unique Reflections (All) 1.05 1.09 96.1 0.406 2.1 3.63 4842
Refinement Statistics Diffraction ID Structure Solution Method Cross Validation method Starting model Resolution (High) Resolution (Low) Number Reflections (All) Number Reflections (Observed) Number Reflections (R-Free) Percent Reflections (Observed) R-Factor (All) R-Factor (Observed) R-Work (Depositor) R-Free (Depositor) R-Free (DCC) R-Free Selection Details Mean Isotropic B X-RAY DIFFRACTION ACORN (DDM) THROUGHOUT 10-RESIDUE ALPHA-HELIX 1.05 24.75 49887 49887 2512 98.01 0.16 0.16 0.16 0.173 0.1835 RANDOM 11.685
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] -0.01 0.18 -0.05 0.07
RMS Deviations Key Refinement Restraint Deviation r_dihedral_angle_2_deg 36.839 r_dihedral_angle_4_deg 13.888 r_dihedral_angle_3_deg 12.453 r_sphericity_free 6.297 r_dihedral_angle_1_deg 5.588 r_scangle_it 4.358 r_scbond_it 3.399 r_sphericity_bonded 3.036 r_mcangle_it 2.161 r_rigid_bond_restr 1.815
RMS Deviations Key Refinement Restraint Deviation r_dihedral_angle_2_deg 36.839 r_dihedral_angle_4_deg 13.888 r_dihedral_angle_3_deg 12.453 r_sphericity_free 6.297 r_dihedral_angle_1_deg 5.588 r_scangle_it 4.358 r_scbond_it 3.399 r_sphericity_bonded 3.036 r_mcangle_it 2.161 r_rigid_bond_restr 1.815 r_mcbond_it 1.761 r_angle_refined_deg 1.39 r_angle_other_deg 0.893 r_mcbond_other 0.756 r_symmetry_vdw_refined 0.268 r_symmetry_vdw_other 0.255 r_nbd_refined 0.223 r_nbtor_refined 0.183 r_nbd_other 0.179 r_symmetry_hbond_refined 0.158 r_xyhbond_nbd_refined 0.146 r_nbtor_other 0.086 r_chiral_restr 0.084 r_bond_refined_d 0.011 r_gen_planes_refined 0.007 r_gen_planes_other 0.004 r_bond_other_d 0.002
Non-Hydrogen Atoms Used in Refinement Non-Hydrogen Atoms Number Protein Atoms 1275 Nucleic Acid Atoms Solvent Atoms 154 Heterogen Atoms 10
Software Software Software Name Purpose d*TREK data scaling REFMAC refinement PDB_EXTRACT data extraction d*TREK data reduction ACORN phasing