1XX8

NMR Structure of the W24A Mutant of the Hyperthermophile Sac7d Protein

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	DQF-COSY	5 mM Sac7d, 90% H2O, 10% D2O	90% H2O/10% D2O		4.5	ambient	303
2	2D TOCSY	5 mM Sac7d, 90% H2O, 10% D2O	90% H2O/10% D2O		4.5	ambient	303
3	2D NOESY	5 mM Sac7d, 90% H2O, 10% D2O	90% H2O/10% D2O		4.5	ambient	303
4	HNHA	5 mM Sac7d, 90% H2O, 10% D2O	90% H2O/10% D2O		4.5	ambient	303
5	2D_HSQC_IPAP	5 mM Sac7d, 90% H2O, 10% D2O	90% H2O/10% D2O		4.5	ambient	303

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	INOVA	500

NMR Refinement
Method	Details	Software
Simulated annealing using cartesion and torsion angle dynamics	NOE assignments, distance restraint calibration, and initial structures were made using ARIA 1.2 with 370 NOE volumes. Final structure refinement was done using CNS 1.1 with 262 unambiguous distance restraints, 13 H-bonds, 48 HNHA coupling constants, and 59 NH residual dipolar couplings.	VNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations
Conformers Calculated Total Number	100
Conformers Submitted Total Number	11
Representative Model	1 (minimized average structure)

Additional NMR Experimental Information
Details	THIS ENTRY CONSISTS OF 11 MODELS, INCLUDING ONE ENERGY-MINIMIZED AVERAGE STRUCTURE FOLLOWED BY AN ENSEMBLE OF THE 10 BEST NMR STRUCTURES.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR	6.1C	Varian
2	processing	Felix	2000	BioSym
3	data analysis	NMRView	5.2.2	Johnson
4	structure solution	ARIA	1.2	Linge, Nilges
5	refinement	CNS	1.1	Brunger, Clore