Experiment: 2X70

Crystal structure of MHC CLass I HLA-A2.1 bound to a photocleavable peptide

X-RAY DIFFRACTION

Starting Model(s)

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

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	293	VAPOUR DIFFUSION HANGING DROP AT 293K: 2 MICROLITER OF 5 MG/ML PROTEIN IN 0.1 M MES PH 6.0 WAS MIXED WITH 2 MICROLITER OF 0.1 M MES PH 6.5, 20-22% PEG 1500. SEEDING WAS USED TO GET BIGGER CRYSTALS

Crystal Properties
Matthews coefficient	Solvent content
2	38

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 61.979	α = 90
b = 81.801	β = 90.77
c = 79.706	γ = 90

Symmetry
Space Group	P 1 21 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	ADSC QUANTUM 315r	MIRRORS	2007-09-06	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID23-1		ESRF	ID23-1

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	81.92	97.2	0.05	9.8	2.3		53033		-3.7	25.2

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	2	2.11	97.2		0.22	2.9	2.3

Refinement

Statistics
Diffraction ID	Structure Solution Method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	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)	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	PDB ENTRY 1EEY	2	19.925	1.38	52222	2753	97.08	0.1623	0.1589	0.1769	0.2249	0.2344	32.74

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]
-1.2884		0.6302	2.7541		-2.1396

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	17.781
f_angle_d	1.245
f_chiral_restr	0.145
f_bond_d	0.004
f_plane_restr	0.003

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6332
Nucleic Acid Atoms
Solvent Atoms	771
Heterogen Atoms	78

Software

Software
Software Name	Purpose
PHENIX	refinement
MOSFLM	data reduction
SCALA	data scaling
AMoRE	phasing