1PFG

Strategy to design inhibitors: Structure of a complex of Proteinase K with a designed octapeptide inhibitor N-Ac-Pro-Ala-Pro-Phe-DAla-Ala-Ala-Ala-NH2 at 2.5A resolution


X-RAY DIFFRACTION Experimental Data & Validation


X-ray Experimental Help

Crystallization

Crystalization Experiments
Method Vapor Diffusion Sitting Drop
pH 6.5
Temperature 289.0
Details 50mM Tris, 1mM CaCl2, 1M NaHNO3, pH 6.5, VAPOR DIFFUSION, SITTING DROP, temperature 289K

Crystal Data

Unit Cell
Length (Å) Angle (°)
a = 68 α = 90
b = 68 β = 90
c = 107.7 γ = 90
Symmetry
Space Group P 43 21 2

Diffraction

Diffraction Experiment
ID # Data Collection Temperature
1 277
Diffraction Detector
Detector Diffraction Type Details Collection Date
IMAGE PLATE MARRESEARCH Graphite monochromator 1995-10-03
Diffraction Radiation
Monochromator Protocol
Graphite SINGLE WAVELENGTH
Diffraction Detector Source
Source Type Wavelength List Synchrotron Site Beamline
SEALED TUBE CONVENTIONAL Cu 1.5418 -- --

Data Collection

Overall
Resolution (High) Resolution (Low) Percent Possible (Observed) R Merge I (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
2.5 20 83.0 0.065 0.069 -- -- 49646 7647 0.0 0.0 --

Refinement

Statistics
Structure Solution Method Refinement High Resolution Refinement Low Resolution Cut-off Sigma (I) Cut-off Sigma (F) Number of Reflections (All) Number of Reflections (Observed) Number of Reflections (R-Free) Percent Reflections (Observed) R-Factor (All) R-Factor (Observed) R-Work R-Free R-Free Selection Details
MOLECULAR REPLACEMENT 2.5 8.0 0.0 0.0 7430 7430 -- -- -- -- 0.167 -- --
RMS Deviations
Key Refinement Restraint Deviation
p_bond_d 0.018
p_angle_d 2.6
Coordinate Error
Parameter Value
Luzzati ESD (Observed) 0.19
Luzzati Sigma A (Observed) 0.17
Luzzati Resolution Cutoff (Low) 8.0
Number of Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms Numbers
Protein Atoms 2071
Nucleic Acid Atoms 0
Heterogen Atoms 0
Solvent Atoms 206

Software

Computing
Computing Package Purpose
MOSFLM Data Reduction (intensity integration)
CCP4 (TRUNCATE) Data Reduction (data scaling)
AMORE Structure Solution
PROLSQ Structure Refinement
Software
Software Name Purpose
PROLSQ refinement
MOSFLM data collection
AMoRE model building
TRUNCATE data reduction