1QLQ

Bovine Pancreatic Trypsin Inhibitor (BPTI) Mutant with Altered Binding Loop Sequence

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.5	292	A PROTEIN SAMPLE, LYOPHILIZED AFTER HPLC PURIFICATION FROM TFA/ACETONITRILE MIXTURE, WAS DISSOLVED IN WATER TO A CONCENTRATION OF 9 MG/ML. 2 UL DROPS OF THE PROTEIN SOLUTION WERE MIXED WITH 2 UL OF RESERVOIR SOLUTION CONTAINING 2% PEG 400, 2 M AMMONIUM SULFATE AND 0.1 M NA HEPES, PH 7.5. THE HANGING DROPLETS WERE EQUILIBRATED AT 19 DEG C THROUGH THE GAS PHASE WITH THE RESERVOIR. PRISMATIC CRYSTALS MEASURING UP TO 0.4 MM GREW WITHIN 12 HOURS.

Crystal Properties
Matthews coefficient	Solvent content
2.36	48

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 52.71	α = 90
b = 52.71	β = 90
c = 43.41	γ = 90

Symmetry
Space Group	P 43 21 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	290	IMAGE PLATE	MARRESEARCH		1999-01-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	SIEMENS SRA2

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	1.42	20	99.6	0.059	50.2	19.3		11934

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	1.42	1.47	96		0.326	5.144	6

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	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	FREE R-VALUE	1BPI	1.42	10	11846	1009	99.8	0.1103	0.1087		0.1609	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
4	429	544.5

RMS Deviations
Key	Refinement Restraint Deviation
s_non_zero_chiral_vol	0.072
s_zero_chiral_vol	0.062
s_similar_adp_cmpnt	0.041
s_angle_d	0.032
s_from_restr_planes	0.0278
s_anti_bump_dis_restr	0.02
s_bond_d	0.014
s_rigid_bond_adp_cmpnt	0.004
s_similar_dist
s_approx_iso_adps

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	452
Nucleic Acid Atoms
Solvent Atoms	98
Heterogen Atoms	18

Software

Software
Software Name	Purpose
SHELXL-97	refinement
DENZO	data reduction
SCALEPACK	data scaling
SHELXL-97	phasing

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.