1SNG

Structure of a Thermophilic Serpin in the Native State

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.6	293	30% PEG 4K, 0.2 M Ammonium Sulfate, 0.1 M Sodium Cacodylate. Additive 0.1 M L-cysteine to drop. , pH 6.6, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.44	49.69

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 45.354	α = 90
b = 81.171	β = 90
c = 106.625	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	298	CCD	ADSC QUANTUM 4	mirrors	2003-07-02	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 14-BM-C	1.0	APS	14-BM-C

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	1.76	26.2		0.084	14.6	3.4	37435	37423	2	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)
	1.76	1.8	98.6		0.425	2.8	3.2

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 (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	Regions of the PDB entry 1MTP predicted to remain relatively unchanged in the native state (residues 5-78; 168-309; 333-367).	1.76	26.2	37435	37423	1981	98.27	0.18775	0.18591	0.22255	RANDOM	14.865

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]
-0.31			-0.05		0.36

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	28.086
r_dihedral_angle_4_deg	13.639
r_dihedral_angle_3_deg	12.192
r_dihedral_angle_1_deg	5.212
r_scangle_it	3.586
r_scbond_it	2.411
r_mcangle_it	1.598
r_angle_refined_deg	1.032
r_mcbond_it	1.019
r_angle_other_deg	0.717
r_mcbond_other	0.191
r_nbd_refined	0.187
r_symmetry_vdw_other	0.179
r_nbd_other	0.173
r_nbtor_refined	0.167
r_symmetry_hbond_refined	0.122
r_xyhbond_nbd_refined	0.108
r_symmetry_vdw_refined	0.092
r_nbtor_other	0.078
r_chiral_restr	0.056
r_bond_refined_d	0.005
r_gen_planes_refined	0.003
r_bond_other_d	0.001
r_gen_planes_other	0.001
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_hbond_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2742
Nucleic Acid Atoms
Solvent Atoms	456
Heterogen Atoms	25

Software

Software
Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing