2NXU

Atomic structure of translation initiation factor aIF2 beta-subunit from Archaebacteria sulfolobus solfataricus: high resolution NMR in solution

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D TOCSY	concentration 10 mg/ml, 20 mM NaCl	10% D2O in H2O	0.2 M	8	1 atm	298
2	2D NOESY	concentration 10 mg/ml, 20 mM NaCl	10% D2O in H2O	0.2 M	8	1 atm	298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AMX	500

NMR Refinement
Method	Details	Software
the structures were obtained by torsion angle dynamic calculation and energy minimization.	The structure were obtained using 635 non redundant NOE-derived distance restraints and were minimised with 1000 steps of conjugated gradient and 1000 of steepest discent. For the first six residues no signals were observed.	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	20
Conformers Submitted Total Number	10
Representative Model	1 (lowest energy)

Additional NMR Experimental Information
Details	The TOCSY spectra were performed with a mixing time of 80 ms. NOESY spectra were acquired with mixing time of 200 and 300 ms. For all spectra watergate was used as scheme for solvent suppression. For the first six residues no signals were observed.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	XwinNMR	2.6	Bruker
2	data analysis	XEASY	1.3.13	P. Guntert and K. Wuthrich et al
3	structure solution	DYANA	1.5	P. Guntert and K. Wuthrich et al
4	refinement	GROMACS	3.3.1	David van der Spoel et al.