Structural basis of ligand recognition by PABC, a highly specific peptide-binding domain found in poly(A)-binding protein and a HECT ubiquitin ligase

1JH4

Sample Conditions

	Sample Contents	3mM 15N-labeled PABC; 3mM 15N-labeled peptide; 50mM phosphate buffer; 0.1M NaCl; 1mM NaN3; pH 6.3
	Solvent	90% H2O/10% D2O
	Ionic Strength	0.1M NaCl
	pH	6.3
	Pressure	ambient
	Temperature (K)	303
	Experiment(s):	3D_15N-separated_NOESY

	Sample Contents	3mM unlabeled PABC; 3mM unlabeled peptide; 50mM phosphate buffer; 0.1M NaCl; 1mM NaN3; pH 6.3
	Solvent	90% H2O/10% D2O
	Ionic Strength	0.1M NaCl
	pH	6.3
	Pressure	ambient
	Temperature (K)	303
	Experiment(s):	2D NOESY

	Sample Contents	3mM unlabeled PABC; 3mM unlabeled peptide; 50mM phosphate buffer; 0.1M NaCl; 1mM NaN3; pH 6.3
	Solvent	100% D2O
	Ionic Strength	0.1M NaCl
	pH	6.3
	Pressure	ambient
	Temperature (K)	303
	Experiment(s):	2D NOESY

	Sample Contents	3mM unlabeled PABC; 3mM N15-labeled peptide; 50mM phosphate buffer; 0.1M NaCl; 1mM NaN3; pH 6.3
	Solvent	90% H2O/10% D2O
	Ionic Strength	0.1M NaCl
	pH	6.3
	Pressure	ambient
	Temperature (K)	303
	Experiment(s):	HNHA

Spectrometer Information
Manufacturer	Model	Field Strength
Bruker	DRX	500.0

NMR Refinement
Method	simulated annealing
Details	The structures are based on 1214 non-redundant NOE-derived distance constraints, 103 dihedral angle restraints, and 40 hydrogen bonds.

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	200
Conformers Submitted Total Number	30

Representative Model Choice Rationale
1	lowest energy

Additional NMR Experimental Information
1	This structure was determined using standard triple-resonance and homonuclear techniques.

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