1QLP

2.0 ANGSTROM STRUCTURE OF INTACT ALPHA-1-ANTITRYPSIN: A CANONICAL TEMPLATE FOR ACTIVE SERPINS

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1PSI	THERMOSTABLE VARIANT ALPHA1-ANTITRYPSIN (PDB ENTRY 1PSI)

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		6		24% PEG 4000, 0.2 M SODIUM ACETATE, 0.1M TRIS-HCL PH 6.0, 2MM FESO4.7H20

Crystal Properties
Matthews coefficient	Solvent content
2.6	37.2

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 114.68	α = 90
b = 39.26	β = 104.21
c = 90.27	γ = 90

Symmetry
Space Group	C 1 2 1

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	MARRESEARCH	MIRRORS	1998-09-09	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SRS BEAMLINE PX9.6		SRS	PX9.6

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	25	93.6	0.079	0.067	5.9	3.3		25057		2	29.41

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	2	2.05	95.2		0.514	0.415	1.6	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	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	FREE R-VALUE	THERMOSTABLE VARIANT ALPHA1-ANTITRYPSIN (PDB ENTRY 1PSI)	2	25	25039	1271	93.6	0.231	0.231	0.266	RANDOM	38.38

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]
-4.094		-6.005	0.601		3.493

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	24.95182
c_mcangle_it	4.732
c_mcbond_it	3.502
c_scangle_it	3.453
c_scbond_it	2.219
c_angle_deg	1.30665
c_improper_angle_d	1.23128
c_bond_d	0.006917
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

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2956
Nucleic Acid Atoms
Solvent Atoms	106
Heterogen Atoms

Software

Software
Software Name	Purpose
CNS	refinement
MOSFLM	data reduction
SCALA	data scaling
CNS	phasing