2ANW

Expression, crystallization and three-dimensional structure of the catalytic domain of human plasma kallikrein: Implications for structure-based design of protease inhibitors

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1P57	hepsin, PDB ENTRY 1P57

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	290	0.5 microliter of the protein solution and 0.5 microliter of the reservoir solution (25% PEG 6000 , 0.10 M MES pH 6.5)., VAPOR DIFFUSION, HANGING DROP, temperature 290.0K

Crystal Properties
Matthews coefficient	Solvent content
2.34	47.5

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 79.886	α = 90
b = 63.19	β = 90
c = 50.313	γ = 90

Symmetry
Space Group	P 21 21 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	138	CCD	ADSC QUANTUM 315		2004-07-22	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 5.0.2	1.000	ALS	5.0.2

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	1.85	20	99.3	0.049	24.4	6.9	22313	22313

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	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	hepsin, PDB ENTRY 1P57	1.85	7	21184	21184	2123	99.4	0.2211	0.2211	0.221	0.283	RANDOM

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]

RMS Deviations
Key	Refinement Restraint Deviation
x_dihedral_angle_d	26.6
x_angle_deg	3.2
x_bond_d	0.018

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2321
Nucleic Acid Atoms
Solvent Atoms	642
Heterogen Atoms	18

Software

Software
Software Name	Purpose
DENZO	data reduction
XTALVIEW	refinement
X-PLOR	refinement
SCALEPACK	data scaling

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.