Experiment: 2X4Q

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		6.5		0.1M MES PH 6.5, 20% PEG1500

Crystal Properties
Matthews coefficient	Solvent content
2.38	44.9

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 62.03	α = 90
b = 86.486	β = 90.21
c = 80.466	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 CCD	MIRRORS	2007-12-08	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SLS BEAMLINE X06SA		SLS	X06SA

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	1.9	50	97.2	0.07	7.9	3.4		64908		-3.7	29.7

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	1.9	2	95.2		0.64	1.1	3.4

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	1.9	32.434	1.38	64885	3415	96.86	0.1693	0.1673	0.1867	0.2059	0.2063	41.74

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]
-1.0298		0.515	-0.8337		-1.3371

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	18.508
f_angle_d	1.337
f_chiral_restr	0.136
f_bond_d	0.006
f_plane_restr	0.004

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6330
Nucleic Acid Atoms
Solvent Atoms	312
Heterogen Atoms	42

Software

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