3UOU

Crystal structure of the Kunitz-type protease inhibitor ShPI-1 Lys13Leu mutant in complex with pancreatic elastase

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1QNJ	PDB ENTRY 1QNJ, PDB ENTRY 3OFW
experimental model	PDB	3OFW	PDB ENTRY 1QNJ, PDB ENTRY 3OFW

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	5.6	288	0.425M ammonium sulfate, 0.085M tri-sodium citrate, 0.85M Lithium sulfate, 15% glycerol, pH 5.6, VAPOR DIFFUSION, SITTING DROP, temperature 288K

Crystal Properties
Matthews coefficient	Solvent content
2.05	40.11

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 132.75	α = 90
b = 47.18	β = 100.07
c = 42.68	γ = 90

Symmetry
Space Group	C 1 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	MAR CCD 165 mm		2011-10-18	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	EMBL/DESY, HAMBURG BEAMLINE X13	0.81	EMBL/DESY, HAMBURG	X13

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	2	29.647	96.8	0.08		4		17481		6.2	17.6

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2	2.1239	80.3

Refinement

Statistics
Diffraction ID	Structure Solution Method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	PDB ENTRY 1QNJ, PDB ENTRY 3OFW	2	29.647	1.43	17474	892	98.07	0.168	0.1657	0.2115	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]
-1.4863		4.6244	13.2011		-1.4417

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	13.321
f_angle_deg	1.047
f_chiral_restr	0.072
f_bond_d	0.007
f_plane_restr	0.004

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2242
Nucleic Acid Atoms
Solvent Atoms	206
Heterogen Atoms	82

Software

Software
Software Name	Purpose
DNA	data collection
PHASER	phasing
PHENIX	refinement
MOSFLM	data reduction
SCALA	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 R01GM133198.