3C9N

Crystal Structure of a SARS Corona Virus Derived Peptide Bound to the Human Major Histocompatibility Complex Class I molecule HLA-B*1501

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1XR9

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		7.5	273	0.2M Magnesium chloride hexahydrate, 0.1M HEPES sodium, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 273K, pH 7.50

Crystal Properties
Matthews coefficient	Solvent content
2.53	51.37

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 50.658	α = 90
b = 81.713	β = 90
c = 109.391	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	173	CCD	MAR CCD 165 mm		2006-12-20	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	MAX II BEAMLINE I911-5		MAX II	I911-5

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	1.87	18.29	99.8	0.064	15.7	4		38220		1	10.47

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)
	1.87	1.97	100		0.362	3.1	4.1

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	1XR9	1.87	18.29	38305	36303	1910	99.8	0.19	0.188	0.227	RANDOM	25.82

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]
-0.7			-0.69		1.39

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.889
r_dihedral_angle_4_deg	17.821
r_dihedral_angle_3_deg	14.563
r_dihedral_angle_1_deg	6.424
r_scangle_it	4.09
r_scbond_it	2.582
r_mcangle_it	1.748
r_angle_refined_deg	1.501
r_mcbond_it	1.179
r_nbtor_refined	0.304
r_symmetry_hbond_refined	0.216
r_nbd_refined	0.208
r_symmetry_vdw_refined	0.205
r_xyhbond_nbd_refined	0.184
r_chiral_restr	0.108
r_bond_refined_d	0.015
r_gen_planes_refined	0.007
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
r_nbd_other
r_nbtor_other
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3184
Nucleic Acid Atoms
Solvent Atoms	357
Heterogen Atoms	28

Software

Software
Software Name	Purpose
SCALA	data scaling
MOLREP	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
MOSFLM	data reduction