2KBL

NMR Structure of a Monomeric Folding Intermediate Reveals the Structural Basis for Rapid Assembly of an Evolutionary Optimized Trimerization Module

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-1H TOCSY	200uM foldon E5R	95% H2O/5% D2O	10	7.0	ambient	296.7
2	2D 1H-1H NOESY	200uM foldon E5R	95% H2O/5% D2O	10	7.0	ambient	296.7
3	2D 1H-15N HSQC	210uM [U-99% 15N] foldon E5R	95% H2O/5% D2O	10	7.0	ambient	296.7
4	3D 1H-15N TOCSY	210uM [U-99% 15N] foldon E5R	95% H2O/5% D2O	10	7.0	ambient	296.7

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DRX	600
2	Bruker	DRX	800

NMR Refinement
Method	Details	Software
simulated annealing, simulated annealing with explicit solvent	TIP3P water model	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations
Conformers Calculated Total Number	100
Conformers Submitted Total Number	10
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	data analysis	XwinNMR		Bruker
2	data analysis	Sparky		Goddard
3	data analysis	NMRPipe		Delaglio, Grzesiek, Vuister, Zhu, Pfeifer and Bax
4	structure calculation	X-PLOR NIH		Schwieters, Kuszewski, Tjandra and Clore
5	refinement	CNS	1.0

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.