2VS2

Neutron diffraction structure of endothiapepsin in complex with a gem- diol inhibitor.

NEUTRON DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		4.6		PH 4.6

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 43.03	α = 90
b = 75.72	β = 97.02
c = 42.97	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	neutron	293	HELIUM-FREE	BROOKHAVEN NATIONAL LAB		2007-08-01

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SPALLATION SOURCE	ORNL Spallation Neutron Source BEAMLINE MANDI	1.0	ORNL Spallation Neutron Source	MANDI

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	R Sym 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	42.72	85.6	0.268	0.268	2.5	3.6		15780

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	2	2.11	73.7		0.369	1.7	2.3

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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
NEUTRON DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	2	20	15766	1032		0.219	0.219	0.281	RANDOM	11.41

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]
3.288		0.399	4.4		1.931

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	15.37
c_angle_deg	1.05
c_improper_angle_d	0.88
c_bond_d	0.006
c_bond_d_na
c_bond_d_prot
c_angle_d
c_angle_d_na
c_angle_d_prot
c_angle_deg_na
c_angle_deg_prot
c_dihedral_angle_d_na
c_dihedral_angle_d_prot
c_improper_angle_d_na
c_improper_angle_d_prot
c_mcbond_it
c_mcangle_it
c_scbond_it
c_scangle_it

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2388
Nucleic Acid Atoms
Solvent Atoms	220
Heterogen Atoms	54

Software

Software
Software Name	Purpose
CNS	refinement
d*TREK	data reduction
d*TREK	data scaling
MOLREP	phasing