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Dimeric alpha-cobratoxin X-ray structure: Localization of intermolecular disulfides and possible mode of binding to nicotinic acetylcholine receptors
Starting Model(s) Initial Refinement Model(s) Type Source Accession Code Details experimental model PDB 2CTX PDB ENTRY 2CTX
Crystallization Crystalization Experiments ID Method pH Temperature Details 1 2 60% (V/V) 2-METHYL-2,4- PENTANEDIOL, 0.1 M GLYCINE-HCL PH 2
Crystal Properties Matthews coefficient Solvent content 2.48 50.44
Crystal Data Unit Cell Length ( Å ) Angle ( ˚ ) a = 86 α = 90 b = 86 β = 90 c = 37.12 γ = 120
Symmetry Space Group P 31 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 100 CCD ADSC CCD 2008-03-15 M SINGLE WAVELENGTH
Radiation Source ID # Source Type Wavelength List Synchrotron Site Beamline 1 SYNCHROTRON ESRF BEAMLINE ID14-1 ESRF ID14-1
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 1.94 37.24 99.8 0.08 17.9 7.7 11890 2
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 1.94 2.05 98.7 0.88 2.1 6.7
Refinement Statistics Diffraction ID Structure Solution Method Cross Validation method Starting model Resolution (High) Resolution (Low) Number Reflections (Observed) Number Reflections (R-Free) Percent Reflections (Observed) R-Factor (Observed) R-Work (Depositor) R-Free (Depositor) R-Free (DCC) R-Free Selection Details Mean Isotropic B X-RAY DIFFRACTION MOLECULAR REPLACEMENT THROUGHOUT PDB ENTRY 2CTX 1.94 37.24 11282 594 100 0.22037 0.21874 0.25142 0.2398 RANDOM 33.338
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] -0.55 -0.27 -0.55 0.82
RMS Deviations Key Refinement Restraint Deviation r_dihedral_angle_2_deg 28.182 r_dihedral_angle_3_deg 12.751 r_dihedral_angle_4_deg 9.027 r_dihedral_angle_1_deg 6.025 r_scangle_it 1.226 r_angle_refined_deg 1.054 r_mcangle_it 0.799 r_scbond_it 0.746 r_mcbond_it 0.434 r_chiral_restr 0.066
RMS Deviations Key Refinement Restraint Deviation r_dihedral_angle_2_deg 28.182 r_dihedral_angle_3_deg 12.751 r_dihedral_angle_4_deg 9.027 r_dihedral_angle_1_deg 6.025 r_scangle_it 1.226 r_angle_refined_deg 1.054 r_mcangle_it 0.799 r_scbond_it 0.746 r_mcbond_it 0.434 r_chiral_restr 0.066 r_bond_refined_d 0.006 r_gen_planes_refined 0.004 r_bond_other_d r_angle_other_deg r_gen_planes_other r_nbd_refined r_nbd_other r_nbtor_refined r_nbtor_other r_xyhbond_nbd_refined r_xyhbond_nbd_other r_metal_ion_refined r_metal_ion_other r_symmetry_vdw_refined r_symmetry_vdw_other r_symmetry_hbond_refined r_symmetry_hbond_other r_symmetry_metal_ion_refined r_symmetry_metal_ion_other r_mcbond_other r_mcangle_other r_scbond_other r_scangle_other r_long_range_B_refined r_long_range_B_other r_rigid_bond_restr r_sphericity_free r_sphericity_bonded
Non-Hydrogen Atoms Used in Refinement Non-Hydrogen Atoms Number Protein Atoms 1004 Nucleic Acid Atoms Solvent Atoms 69 Heterogen Atoms 13
Software Software Software Name Purpose REFMAC refinement XDS data reduction SCALA data scaling PHASER phasing