1HB0 | pdb_00001hb0

Snapshots of serine protease catalysis: (D) acyl-enzyme intermediate between porcine pancreatic elastase and human beta-casomorphin-7 jumped to pH 10 for 2 minutes

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1QIX	PDB ENTRY 1QIX

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		10		CRYSTALLISED FROM 25MM SODIUM SULPHATE, 25MM SODIUM ACETATE (PH 5.0), 25 MG/ML PPE AND 25 MG/ML BCM7.

Crystal Properties
Matthews coefficient	Solvent content
1.78	30.3

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 49.63	α = 90
b = 57.6	β = 90
c = 73.44	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	100	CCD	PRINCETON		1997-01-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-3		ESRF	ID14-3

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	2.05	26.8	93.3	0.105	9.6	2.7		12678			12.6

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	2.05	2.1	85.9		0.254	6.8	2.4

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 1QIX	2.05	38	12678	510	92.3	0.199	0.199	0.2	0.246	0.25	RANDOM	15.6

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]
-10.3			2.346		7.954

RMS Deviations
Key	Refinement Restraint Deviation
c_scangle_it	2.564
c_mcangle_it	1.851
c_scbond_it	1.845
c_mcbond_it	1.279
c_angle_deg	1.25
c_bond_d	0.005
c_bond_d_na
c_bond_d_prot
c_angle_d
c_angle_d_na

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1810
Nucleic Acid Atoms
Solvent Atoms	120
Heterogen Atoms	6

Software

Software
Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	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.