2BD9

Porcine pancreatic elastase complexed with beta-casomorphin-7 and Arg-Phe at pH 5.0 (50 min soak) and immersed in pH 9 buffer for 28 seconds (2nd pH jump)

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	3EST

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	5	294	25MM SODIUM SULPHATE, 25MM SODIUM ACETATE (PH 5.0), 25 MG/ML PPE AND 17.5 MG/ML BCM7, AND THEN SOAKED WITH ARG-PHE (2 MG) IN 250MM SODIUM ACETATE (PH 5.0) (5 MICROLITRES) FOR 50 MIN , VAPOR DIFFUSION, HANGING DROP, temperature 294K

Crystal Properties
Matthews coefficient	Solvent content
2.13	42.32

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 51.38	α = 90
b = 57.59	β = 90
c = 74.758	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	127	IMAGE PLATE	RIGAKU RAXIS IV	OSMIC mirrors	2005-07-03	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU MICROMAX-007

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	1.9	19.87	99.4	0.063	16.1	3.4		17944			23.2

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	1.9	2	99		0.328	3	3.3	2550

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-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	3EST	1.9	19.87	17944	17910	914	99.14	0.175	0.175	0.172	0.226	RANDOM	33.436

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]
2.62			-1.01		-1.61

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.843
r_dihedral_angle_4_deg	20.939
r_dihedral_angle_3_deg	12.282
r_dihedral_angle_1_deg	6.109
r_scangle_it	5.41
r_scbond_it	4.48
r_mcangle_it	2.971
r_mcbond_it	2.208
r_angle_refined_deg	1.274
r_nbtor_refined	0.303

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.843
r_dihedral_angle_4_deg	20.939
r_dihedral_angle_3_deg	12.282
r_dihedral_angle_1_deg	6.109
r_scangle_it	5.41
r_scbond_it	4.48
r_mcangle_it	2.971
r_mcbond_it	2.208
r_angle_refined_deg	1.274
r_nbtor_refined	0.303
r_symmetry_vdw_refined	0.235
r_symmetry_hbond_refined	0.233
r_nbd_refined	0.192
r_metal_ion_refined	0.143
r_xyhbond_nbd_refined	0.131
r_chiral_restr	0.084
r_bond_refined_d	0.012
r_gen_planes_refined	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1802
Nucleic Acid Atoms
Solvent Atoms	121
Heterogen Atoms	6

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
REFMAC	refinement
PDB_EXTRACT	data extraction
MOSFLM	data reduction
CCP4	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 R01GM157729.