1I1Y

CRYSTAL STRUCTURE OF HUMAN CLASS I MHC (HLA-A2.1) COMPLEXED WITH BETA 2-MICROGLOBULIN AND HIV-RT VARIANT PEPTIDE I1Y

X-RAY DIFFRACTION

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Starting Model(s)

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

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5		PROTEIN WAS CRYSTALLIZED IN THE HANGING DROP VAPOR DIFFUSION METHOD. THE RESERVOIR SOLUTION CONTAINED 18% PEG8000, IN 25MM MES BUFFER, PH6.5. THE HANGING DROP WAS A 1:1 MIXTURE OF THE RESERVOIR SOLUTION AND THE PROTEIN SOLUTION WHICH CONTAINED 10MG/ML PROTEIN IN 25MM MES BUFFER, PH6.5., pH 6.50, VAPOR DIFFUSION, HANGING DROP

Crystal Properties
Matthews coefficient	Solvent content
4	47

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 50.613	α = 81.93
b = 63.591	β = 75.94
c = 75.326	γ = 78

Symmetry
Space Group	P 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		1997-05-01	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS BEAMLINE X12B		NSLS	X12B

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	2.2	30	97.9	0.073	9.7	4.9		45024			21.5

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)
	2.2	2.24	96.4		0.231	23.1	2.2

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	THROUGHOUT	PDB ENTRY 1HHH	2.2	15	40341	3600	98	0.244	0.233	0.289	RANDOM	21.7

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]

RMS Deviations
Key	Refinement Restraint Deviation
p_transverse_tor	25.9
p_staggered_tor	19.3
p_planar_tor	9.7
p_scangle_it	2.96
p_mcangle_it	2.403
p_scbond_it	1.834
p_mcbond_it	1.434
p_multtor_nbd	0.25
p_xyhbond_nbd	0.19
p_singtor_nbd	0.173
p_chiral_restr	0.107
p_planar_d	0.057
p_angle_d	0.034
p_plane_restr	0.022
p_bond_d	0.01
p_angle_deg
p_hb_or_metal_coord
p_xhyhbond_nbd
p_orthonormal_tor
p_special_tor

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	6316
Nucleic Acid Atoms
Solvent Atoms	199
Heterogen Atoms

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing
REFMAC	refinement
CCP4	phasing