7VLJ

Crystal structure of Entamoeba histolytica serine protease inhibitor, Histopin, in the cleaved conformation

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP		289	25% Polyethylene glycol monomethyl ether 2000, 0.2M Potassium thiocyanate

Crystal Properties
Matthews coefficient	Solvent content
1.96	37.37

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 39.13	α = 90
b = 61.01	β = 90
c = 137.253	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	PIXEL	DECTRIS EIGER X 4M		2018-04-07	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE MASSIF-3	0.9677	ESRF	MASSIF-3

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	CC (Half)	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	1.83	45.64	98.5	0.066	0.998	17.2	7.3		29415

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.83	1.87	92		0.977		7.1

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	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	THROUGHOUT	3NDA	1.83	45.64	27803	1508	98.15	0.1591	0.1568	0.203	RANDOM	18.274

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]
-0.24			-0.64		0.88

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.151
r_dihedral_angle_3_deg	14.194
r_dihedral_angle_1_deg	6.932
r_dihedral_angle_4_deg	6.375
r_angle_refined_deg	1.742
r_angle_other_deg	1.456
r_chiral_restr	0.088
r_bond_refined_d	0.012
r_gen_planes_refined	0.009
r_bond_other_d	0.001

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.151
r_dihedral_angle_3_deg	14.194
r_dihedral_angle_1_deg	6.932
r_dihedral_angle_4_deg	6.375
r_angle_refined_deg	1.742
r_angle_other_deg	1.456
r_chiral_restr	0.088
r_bond_refined_d	0.012
r_gen_planes_refined	0.009
r_bond_other_d	0.001
r_gen_planes_other	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2926
Nucleic Acid Atoms
Solvent Atoms	218
Heterogen Atoms	73

Software

Software
Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
XDS	data reduction
XDS	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 R01GM133198.