2XTT

Bovine trypsin in complex with evolutionary enhanced Schistocerca gregaria protease inhibitor 1 (SGPI-1-P02)

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1K1J	PDB ENTRY 1K1J

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		4.6		EQUAL AMOUNT OF PROTEIN SOLUTION (9.1 MG/ML PROTEIN COMPLEX IN 0.5 MM MES PH 6.0 BUFFER) AND PRECIPITANT SOLUTION (30% PEG 4000, 0.3 M AMMONIUM ACETATE, 0.1 M NA-ACETATE PH 4.6) WERE MIXED AND EQUILIBRATED AGAINST 0.5 ML PRECIPITANT SOLUTION.

Crystal Properties
Matthews coefficient	Solvent content
1.89	34.9

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 36.91	α = 90
b = 63.61	β = 93.85
c = 43.87	γ = 90

Symmetry
Space Group	P 1 21 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		2008-09-30	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	0.93	43.8	91.3	0.04	17.9	3.4		135272		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	0.93	0.98	54		0.34	2.2	1.8

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	FREE R-VALUE	PDB ENTRY 1K1J	0.93	10	122128	2035	91	0.1168		0.1397	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]

Coordinate Error
Structure Solution Method	Refinement High Resolution	Refinement Low Resolution
21	1820.58	2225.9

RMS Deviations
Key	Refinement Restraint Deviation
s_anti_bump_dis_restr	0.121
s_approx_iso_adps	0.116
s_non_zero_chiral_vol	0.107
s_zero_chiral_vol	0.1
s_from_restr_planes	0.0346
s_angle_d	0.034
s_similar_adp_cmpnt	0.031
s_bond_d	0.018
s_rigid_bond_adp_cmpnt	0.007
s_similar_dist

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1876
Nucleic Acid Atoms
Solvent Atoms	350
Heterogen Atoms	5

Software

Software
Software Name	Purpose
SHELXL-97	refinement
XDS	data reduction
XSCALE	data scaling
PHASER	phasing

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.