1D1O

COOPERATIVITY IN EF-HAND CA2+-BINDING PROTEINS: EVIDENCE OF SITE-SITE COMMUNICATION FROM BINDING-INDUCED CHANGES IN STRUCTURE AND DYNAMICS OF N56A CALBINDIN D9K

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	4 MM N56A-CALBINDIN D9K		0	6.0	AMBIENT	300
2	3D_15N-SEPARATED_NOESY	4 MM 15N-LABELED N56A-CALBINDIN D9K;		0	6.0	AMBIENT	300
3	HSQC-J	4 MM 15N-LABELED N56A-CALBINDIN D9K;		0	6.0	AMBIENT	300

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AMX	500
2	Bruker	DRX	600
3	Varian	INOVA	600

NMR Refinement
Method	Details	Software
DISTANCE GEOMETRY FOLLOWED BY SIMULATED ANNEALING	NMR REFINEMENT WAS BASED ON A TOTAL OF 910 NOE-DERIVED DISTANCE CONSTRAINTS AND 78 TORSION ANGLE CONSTRAINTS. SIMULATED ANNEALING CYCLE OF 20 PS HEATING TO 1200 K.	Felix

NMR Ensemble Information
Conformer Selection Criteria	STRUCTURES WITH ACCEPTABLE MOLECULAR ENEGIES WERE ORDERED BY LEAST RESTRAINT VIOLATIONS. THE 24 BEST CONFORMERS WERE SELECTED TO FACILITATE COMPARISON TO PREVIOUS STRUCTURES OF THE PROTEIN AND BECAUSE THIS SURPASSES THE STATISTICAL REQUIREMENT TO REPRESENT ALL OF CONFORMATIONAL SPACE CONSISTENT WITH THE DATA.
Conformers Calculated Total Number	50
Conformers Submitted Total Number	24
Representative Model	1 (closest to the average)

Additional NMR Experimental Information
Details	1H RESONANCE ASIGNMENTS WERE REPORTED IN THE PROTEIN SCIENCE PAPER BY WIMBERLY ET AL. A 3D 15N SPARATED TOCSY WAS RECORDED TO CONFIRM THESE ASSIGNMENTS AND ASSIGN THE 15N RESONANCES.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	Felix	97.0	MSI, SAN DIEGO, CA
2	structure solution	DIANA	2.8	GUNTERT, BRAUN, BILLETER, WUTHRICH
3	refinement	Amber	4.1	PEARLMAN, CASE, CALDWELL, ROSS, CHEATHAM, FERGUSON, SEIBEL, SINGH, WEINER, KOLLMAN

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), 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 R01GM157729.