1F5Y

NMR STRUCTURE OF A CONCATEMER OF THE FIRST AND SECOND LIGAND-BINDING MODULES OF THE HUMAN LDL RECEPTOR

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D-TOCSY	1 mM LB1-2, 15 mM CaCl2, pH 5.5	95% H2O/5% D2O	0.045	5.5	atmospheric atm	310
2	DQF-COSY	1 mM LB1-2, 15 mM CaCl2, pH 5.5	95% H2O/5% D2O	0.045	5.5	atmospheric atm	310
3	2D NOESY	1 mM LB1-2, 15 mM CaCl2, pH 5.5	95% H2O/5% D2O	0.045	5.5	atmospheric atm	310
4	E-COSY	1 mM LB1-2, 15 mM CaCl2, pH 5.5	99% D2O	0.045	5.5	atmospheric atm	310

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DMX	750

NMR Refinement
Method	Details	Software
Torsion angle dynamics (DYANA) followed by simulated annealing and molecular dynamics (X-PLOR) for calcium coordination	NMR inputs: NOE total 889: 286 intra, 273 sequential, 184 medium, 146 long range; Others: 32 dihedral restraints, 13 h-bonds, 12 calcium coordination	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	50
Conformers Submitted Total Number	20
Representative Model	2 (lowest energy)

Additional NMR Experimental Information
Details	This structure was determined using standard 2D homonuclear techniques

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	XwinNMR	2	BRUKER
2	data analysis	XEASY	1.4	ETH-Zurich
3	structure solution	DYANA	1.5	Guntert
4	refinement	X-PLOR	3.85	Brunger
5	data analysis	MOLMOL	2.6	Koradi

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.