1OEX

Atomic Resolution Structure of Endothiapepsin in Complex with a Hydroxyethylene Transition State Analogue Inhibitor H261

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		4.6		BATCH METHOD WITH ENZYME AT A CONCENTRATION OF 2 MG/ML IN 100 MM SODIUM ACETATE BUFFER AT PH 4.6 (MOEWS AND BUNN, 1970). CRYSTALS LEFT TO GROW FOLLOWING SLOW ADDITION OF AMMONIUM SULPHATE TO FINAL CONCENTRATION OF 0.35 G/ML (55% SATURATION).

Crystal Properties
Matthews coefficient	Solvent content
1.99	38

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 42.58	α = 90
b = 74.51	β = 97.56
c = 42.35	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	IMAGE PLATE	MARRESEARCH		1998-06-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	EMBL/DESY, HAMBURG BEAMLINE BW7B		EMBL/DESY, HAMBURG	BW7B

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	1.1	15.6	99.8	0.125	9.8	3.7		105807

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	1.1	1.14	99.5		0.32	4.8	3.5

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	OTHER	THROUGHOUT	1.1	100	105807	5285	99.8	0.14		0.178	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
25

RMS Deviations
Key	Refinement Restraint Deviation
s_zero_chiral_vol	0.079
s_non_zero_chiral_vol	0.078
s_anti_bump_dis_restr	0.074
s_approx_iso_adps	0.071
s_from_restr_planes	0.032
s_similar_adp_cmpnt	0.03
s_angle_d	0.028
s_bond_d	0.013
s_rigid_bond_adp_cmpnt	0.005
s_similar_dist

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2462
Nucleic Acid Atoms
Solvent Atoms	499
Heterogen Atoms	26

Software

Software
Software Name	Purpose
SHELXL-97	refinement
MOSFLM	data reduction
Agrovata	data scaling
ROTAVATA	data scaling
SHELXL-97	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.