6P23

Structure of a nested set of N-terminally extended MHC I-peptides provide novel insights into antigen processing presentation

Experimental procedure

Experimental method	SINGLE WAVELENGTH
Source type	SYNCHROTRON
Source details	APS BEAMLINE 21-ID-F
Synchrotron site	APS
Beamline	21-ID-F
Temperature [K]	77
Detector technology	CCD
Collection date	2018-08-16
Detector	MARMOSAIC 300 mm CCD
Wavelength(s)	0.987
Spacegroup name	P 21 21 21
Unit cell lengths	50.542, 81.350, 110.581
Unit cell angles	90.00, 90.00, 90.00

Refinement procedure

Resolution	19.661 - 1.595
R-factor	0.1967
Rwork	0.195
R-free	0.22690
Structure solution method	MOLECULAR REPLACEMENT
Starting model (for MR)	1agb
RMSD bond length	0.009
RMSD bond angle	1.250
Data reduction software	XDS
Data scaling software	XDS
Phasing software	PHASES
Refinement software	PHENIX (1.8.1_1168)

Data quality characteristics

	Overall	Outer shell
Low resolution limit [Å]	19.700	1.650
High resolution limit [Å]	1.590	1.590
Rmerge	0.053
Number of reflections	61192	5780
<I/σ(I)>	7.2
Completeness [%]	99.5	95.2
Redundancy	6.2

Crystallization Conditions

crystal ID	method	pH	temperature	details
1	VAPOR DIFFUSION		298	0.2 M ammonium sulfate, 18% PEG4000, 0.1 M sodium cacodylate, pH 5.7