2LTH

NMR structure of major ampullate spidroin 1 N-terminal domain at pH 5.5

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-15N HSQC	1.5 mM [U-99% 13C; U-99% 15N] Major ampullate spidroin 1, 5 % [U-100% 2H] D2O, 0.03 % sodium azide, 20 mM sodium acetate, 20 mM sodium chloride	95% H2O/5% D2O	0.04	5.5	ambient	298
2	3D HNCA	1.5 mM [U-99% 13C; U-99% 15N] Major ampullate spidroin 1, 5 % [U-100% 2H] D2O, 0.03 % sodium azide, 20 mM sodium acetate, 20 mM sodium chloride	95% H2O/5% D2O	0.04	5.5	ambient	298
3	3D 1H-13C NOESY aliphatic	1.5 mM [U-99% 13C; U-99% 15N] Major ampullate spidroin 1, 5 % [U-100% 2H] D2O, 0.03 % sodium azide, 20 mM sodium acetate, 20 mM sodium chloride	95% H2O/5% D2O	0.04	5.5	ambient	298
4	3D 1H-13C NOESY aromatic	1.5 mM [U-99% 13C; U-99% 15N] Major ampullate spidroin 1, 5 % [U-100% 2H] D2O, 0.03 % sodium azide, 20 mM sodium acetate, 20 mM sodium chloride	95% H2O/5% D2O	0.04	5.5	ambient	298
5	3D 1H-15N NOESY	1.5 mM [U-99% 13C; U-99% 15N] Major ampullate spidroin 1, 5 % [U-100% 2H] D2O, 0.03 % sodium azide, 20 mM sodium acetate, 20 mM sodium chloride	95% H2O/5% D2O	0.04	5.5	ambient	298

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

NMR Refinement
Method	Details	Software
torsion angle dynamics, simulated annealing		CYANA

NMR Ensemble Information
Conformer Selection Criteria	target function
Conformers Calculated Total Number	100
Conformers Submitted Total Number	20
Representative Model	1 (closest to the average)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	CYANA	2.1	Guntert, Mumenthaler and Wuthrich
2	refinement	CNS	1.2	Brunger, Adams, Clore, Gros, Nilges and Read
3	collection	VnmrJ	2.1b	Varian
4	chemical shift assignment	CARA	1.9.0	Keller and Wuthrich
5	processing	TopSpin		Bruker Biospin
6	data analysis	UNIO	2.0.2	T. Herrmann, F. Fiorito, J. Volk
7	peak picking	UNIO	2.0.2	T. Herrmann, F. Fiorito, J. Volk
8	refinement	CYANA	2.1	Guntert, Mumenthaler and Wuthrich