2F3C

Crystal structure of infestin 1, a Kazal-type serineprotease inhibitor, in complex with trypsin

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1AN1	PDB ENTRIES 1AN1 and 2ERW
experimental model	PDB	2ERW	PDB ENTRIES 1AN1 and 2ERW

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	8.5	303	30% PEG 4000, 0.1M Tris-HCl, 0.2 M lithium sulfate, pH 8.5, VAPOR DIFFUSION, SITTING DROP, temperature 303K

Crystal Properties
Matthews coefficient	Solvent content
2.1	41.36

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 57.993	α = 90
b = 62.692	β = 90
c = 67.837	γ = 90

Symmetry
Space Group	P 21 21 21

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	MARRESEARCH		2004-03-18	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	LNLS BEAMLINE D03B-MX1	1.427	LNLS	D03B-MX1

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	2.501	46.127	99.7		4.5	8984	8955

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	2.5	2.59	98.1			3.3

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-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRIES 1AN1 and 2ERW	2.5	30	8948	8948	424	99.71	0.174	0.17	0.252	RANDOM	26.609

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]
0.17			1.01		-1.18

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	42.763
r_dihedral_angle_3_deg	16.181
r_dihedral_angle_4_deg	12.263
r_dihedral_angle_1_deg	7.028
r_scangle_it	2.392
r_angle_refined_deg	1.54
r_scbond_it	1.535
r_mcangle_it	0.938
r_mcbond_it	0.51
r_nbtor_refined	0.306

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	42.763
r_dihedral_angle_3_deg	16.181
r_dihedral_angle_4_deg	12.263
r_dihedral_angle_1_deg	7.028
r_scangle_it	2.392
r_angle_refined_deg	1.54
r_scbond_it	1.535
r_mcangle_it	0.938
r_mcbond_it	0.51
r_nbtor_refined	0.306
r_symmetry_hbond_refined	0.227
r_nbd_refined	0.212
r_metal_ion_refined	0.17
r_xyhbond_nbd_refined	0.156
r_symmetry_vdw_refined	0.143
r_chiral_restr	0.087
r_bond_refined_d	0.014
r_gen_planes_refined	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1952
Nucleic Acid Atoms
Solvent Atoms	91
Heterogen Atoms	21

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
MOLREP	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
HKL-2000	data reduction
HKL-2000	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.