1RR8

Structural Mechanisms of Camptothecin Resistance by Mutations in Human Topoisomerase I


X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
TypeSourceAccession CodeDetails
experimental modelPDB 1K4TPDB ENTRY 1K4T

Crystallization

Crystalization Experiments
IDMethodpHTemperatureDetails
1VAPOR DIFFUSION, HANGING DROP6.5289PEG 8000, 200mM Lithium Sulfate, 100mM Mes, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 289K
Crystal Properties
Matthews coefficientSolvent content
3.0759.99

Crystal Data

Unit Cell
Length ( Å )Angle ( ˚ )
a = 57.59α = 90
b = 115.585β = 96.29
c = 75.01γ = 90
Symmetry
Space GroupP 1 21 1

Diffraction

Diffraction Experiment
ID #Crystal IDScattering TypeData Collection TemperatureDetectorDetector TypeDetailsCollection DateMonochromatorProtocol
11x-ray100CCDMARRESEARCH2002-02-04MSINGLE WAVELENGTH
Radiation Source
ID #SourceTypeWavelength ListSynchrotron SiteBeamline
1SYNCHROTRONNSLS BEAMLINE X251.1NSLSX25

Data Collection

Overall
ID #Resolution (High)Resolution (Low)Percent Possible (Observed)R Sym 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
12.620.0292.90.085300632785535.9
Highest Resolution Shell
ID #Resolution (High)Resolution (Low)Percent Possible (All)Percent Possible (Observed)Mean I Over Sigma (Observed)RedundancyNumber Unique Reflections (All)
2.62.7681.8

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 (All)R-Factor (Observed)R-WorkR-FreeR-Free Selection DetailsMean Isotropic B
X-RAY DIFFRACTIONMOLECULAR REPLACEMENTTHROUGHOUTPDB ENTRY 1K4T2.619.727855278552744100.2420.2920.2420.294RANDOM
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]
1.535.78-7.525.99
RMS Deviations
KeyRefinement Restraint Deviation
c_dihedral_angle_d22.6
c_angle_deg2.2
c_improper_angle_d1.55
c_bond_d0.054
Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen AtomsNumber
Protein Atoms4124
Nucleic Acid Atoms895
Solvent Atoms304
Heterogen Atoms63

Software

Software
Software NamePurpose
HKL-2000data collection
TRUNCATEdata reduction
AMoREphasing
CNSrefinement
HKL-2000data reduction
CCP4data scaling