2K3C

Structural and Functional Characterization of TM IX of the NHE1 Isoform of the Na+/H+ Exchanger

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-13C HSQC	0.8-1.0 mM TMIX peptide	95% H2O/5% D2O		5.05	ambient	303.15
2	2D 1H-1H TOCSY	0.8-1.0 mM TMIX peptide	95% H2O/5% D2O		5.05	ambient	303.15
3	2D 1H-1H NOESY	0.8-1.0 mM TMIX peptide	95% H2O/5% D2O		5.05	ambient	303.15

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	INOVA	800

NMR Refinement
Method	Details	Software
simulated annealing	21 rounds of structural refinement in XPLOR-NIH by simulated annealing, then an additional 6 rounds were performed with dihedral angle potential scaling factors of 5, 50, 100, 100, 50 and 25. 15,000 cooling steps.	X-PLOR NIH

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	100
Conformers Submitted Total Number	40
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	X-PLOR NIH	2.18	Schwieters, Kuszewski, Tjandra and Clore
2	peak picking	Sparky	3.112	Goddard
3	processing	NMRPipe		Delaglio, Grzesiek, Vuister, Zhu, Pfeifer and Bax
4	processing	NMRDraw		Delaglio, Grzesiek, Vuister, Zhu, Pfeifer and Bax
5	refinement	X-PLOR NIH	2.18	Schwieters, Kuszewski, Tjandra and Clore

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.