1DU2

SOLUTION STRUCTURE OF THE THETA SUBUNIT OF DNA POLYMERASE III

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	3D_15N-separated_NOESY	1 mM Theta subunit U-15N; 10 mM phosphate buffer pH 6.5;	90% H2O/10% D2O	0.03	6.5	aambient	298
2	3D_15N-separated_TOCSY	1 mM Theta subunit U-15N; 10 mM phosphate buffer pH 6.5;	90% H2O/10% D2O	0.03	6.5	aambient	298
3	HNHA	1 mM Theta subunit U-15N; 10 mM phosphate buffer pH 6.5;	90% H2O/10% D2O	0.03	6.5	aambient	298
4	HNHB	1 mM Theta subunit U-15N; 10 mM phosphate buffer pH 6.5;	90% H2O/10% D2O	0.03	6.5	aambient	298
5	3D_13C-separated_NOESY	1 mM Theta subunit U-15N,13C; 10 mM phosphate buffer, pH 6.5	90% H2O/10% D2O	0.03	6.5	ambient	298
6	2D NOESY	1 mM Theta subunit; 10 mM phosphate buffer pH 6.5;	100% D2O	0.03	6.5	ambient	298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	INOVA	600
2	Varian	VXRS	500
3	Varian	INOVA	500

NMR Refinement
Method	Details	Software
torsion angle dynamics	The structures are based on 819 restraints, 511 are NOE-derived distance constraints, 300 dihedral angle restraints and 8 distance restraints from hydrogen bonds	VNMR

NMR Ensemble Information
Conformer Selection Criteria	target function
Conformers Calculated Total Number	400
Conformers Submitted Total Number	20
Representative Model	1 (fewest violations)

Additional NMR Experimental Information
Details	The structure was determined by double and triple resonance heteronuclear NMR spectroscopy techniques. There is evidence of substantial conformational exchange in sections of the chain that severely limit the precision of the structure in these regions of the molecule. Specifically, conformational exchange occurs in the regions D19-M33 and L55-S63.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR	5.2 and 6.1	Varian Associates
2	data analysis	XEASY	1.3.10	Bartels
3	refinement	SPSCAN	1.0.53	Glaser
4	refinement	DYANA	1.5	Guentert