Experiment: 1M2F

Solution structure of the N-terminal domain of Synechococcus elongatus KaiA (KaiA135N); Family of 25 structures

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	HNHA	3mM KaiA135N U-15N; 50mM sodium chloride; 20mM phosphate buffer	95% H2O/5% D2O	0.17	7.0	ambient	298
2	4D_13C/15N-separated_NOESY	3mM KaiA135N U-15N,13C; 50mM sodium chloride; 20mM phosphate buffer	95% H2O/5% D2O	0.17	7.0	ambient	298
3	4D_13C-separated_NOESY	3mM KaiA135N U-15N,13C; 50mM sodium chloride; 20mM phosphate buffer	100% D2O	0.17	7.0	ambient	298
4	HNHB	3mM KaiA135N U-15N; 50mM sodium chloride; 20mM phosphate buffer	95% H2O/5% D2O	0.17	7.0	ambient	298
5	HAHB	3mM KaiA135N U-15N,13C; 50mM sodium chloride; 20mM phosphate buffer	100% D2O	0.17	7.0	ambient	298
6	BRCTCO/BRCTCN	3mM KaiA135N U-15N,13C; 50mM sodium chloride; 20mM phosphate buffer	100% D2O	0.17	7.0	ambient	298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	INOVA	600

NMR Refinement
Method	Details	Software
Distance geometry, Simulated annealing regularization, Simulated annealing refinement	The structures are based on 2034 restraints: 1816 are NOE-derived distance constraints, 187 dihedral angle restraints, 31 distance restraints from hydrogen bonds	VNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	50
Conformers Submitted Total Number	25
Representative Model	2 (closest to the average)

Additional NMR Experimental Information
Details	Submission corresponds to family of 25-low-energy-structures. The 1H, 15N and 13C chemical shifts of KaiA135N are deposited at the BMRB database (http://www.bmrb.wisc.edu) under the accession number 5031.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR	6.1b	Varian Associates
2	processing	NMRPipe	1.8 Rev 2001.030.21.27	Delaglio
3	data analysis	PIPP	4.2.6	Garrett
4	refinement	X-PLOR	3.851	Brunger