1XSC | pdb_00001xsc

Structure of the nudix enzyme AP4A hydrolase from homo sapiens (E63A mutant) in complex with ATP

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	1.0mM human AP4A hydrolase, 13C 15N ATP	20mM MgCl2, 20mM imidazole, pH 6.5, 90% H2O 10% D2O, 10mM DTT, 1mM EDTA, 1.5mM ATP (13C,15N labelled)	51mM	6.5	ambient	293
2	13C noesy over Aromatic/Anomeric	1.0mM human AP4A hydrolase, 13C 15N ATP	20mM MgCl2, 20mM imidazole, pH 6.5, 100% D2O, 10mM DTT, 1mM EDTA, 1.5mM ATP (13C, 15N labelled)	51mM	6.5	ambient	293

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

NMR Refinement
Method	Details	Software
CNS from a starting structure with ATP 20A from binding site, Refine against NOE/CACB no RAMA potential		CNS

NMR Ensemble Information
Conformer Selection Criteria	target function
Conformers Calculated Total Number	100
Conformers Submitted Total Number	25
Representative Model	1 (lowest energy)

Additional NMR Experimental Information
Details	This calcualtion includes ATP constraints. Slow cooling, Lower temperature (20000K rather than 50000K) ATP starts 20A from lowest energy conformer Residues 1 and 2 are changed from GP to Alanine in the calculations. These are from the non native precission cleavage site and are unstructrued.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	refinement	CNS	1.0