2RA3

Human cationic trypsin complexed with bovine pancreatic trypsin inhibitor (BPTI)

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1TRN	PDB entries 1TRN and 2PTC
experimental model	PDB	2PTC	PDB entries 1TRN and 2PTC

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8.5	298	0.1M Tris hydrochloride pH 8.5, 1.6M ammonium sulfate, VAPOR DIFFUSION, HANGING DROP, temperature 298.0K

Crystal Properties
Matthews coefficient	Solvent content
3.13	60.71

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 91.183	α = 90
b = 186.546	β = 90
c = 90.187	γ = 90

Symmetry
Space Group	C 2 2 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	ADSC QUANTUM 4		2006-10-27	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS BEAMLINE X12B	0.95	NSLS	X12B

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	1.46	26.144	87.1	0.057	0.057	19.5	7.5		115118	-3	-3	17.335

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	1.46	1.54	46.8		0.465	0.465	1.9	2.3

Refinement

Statistics
Diffraction ID	Structure Solution Method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	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	PDB entries 1TRN and 2PTC	1.46	26.13	115064	115064	11506	86.8	0.1539	0.153	0.1777	Random	16.36

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]

RMS Deviations
Key	Refinement Restraint Deviation
f_angle_deg	0.793
f_bond_d	0.006
f_bond_d_na
f_bond_d_prot
f_angle_d
f_angle_d_na
f_angle_d_prot
f_angle_deg_na
f_angle_deg_prot
f_dihedral_angle_d
f_dihedral_angle_d_na
f_dihedral_angle_d_prot
f_improper_angle_d
f_improper_angle_d_na
f_improper_angle_d_prot
f_mcbond_it
f_mcangle_it
f_scbond_it
f_scangle_it

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4456
Nucleic Acid Atoms
Solvent Atoms	665
Heterogen Atoms	127

Software

Software
Software Name	Purpose
ADSC	data collection
PHENIX	model building
PHENIX	refinement
MOSFLM	data reduction
SCALA	data scaling
PHENIX	phasing