1AJY

STRUCTURE AND MOBILITY OF THE PUT3 DIMER: A DNA PINCER, NMR, 13 STRUCTURES

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	NOESY (1H				6.5		303
2	13C				6.5		303
3	15N)				6.5		303
4	TOCSY				6.5		303
5	HNHA				6.5		303
6	HNHB				6.5		303
7	P.COSY				6.5		303

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	UP750	750
2	Bruker	AMX600	600

NMR Refinement
Method	Details	Software
molecular dynamics	PROGRAMS WRITTEN BY MICHAEL NILGES FOR SYMMETRIC DIMERS WERE USED (NILGES, M. PROTEINS 17, 297-309 (1993)). STRUCTURES WERE STARTED FROM AN EXTENDED MONOMER CONFORMATION AND RANDOM ROTATIONS WERE MADE AROUND THE PHI-PSI ANGLES. THE MONOMER WAS THEN DUPLICATED AND MOLECULAR DYNAMICS WAS PERFORMED USING NMR DISTANCE RESTRAINTS AND GENERATED SYMMETRY DISTANCE RESTRAINTS. RMSD CALCULATED BY SUPERIMPOSING STRUCTURES ON LOWEST ENERGY STRUCTURE FOR RESIDUES 33-62 OF EACH MONOMER AND 68-98 OF EACH DIMER. RMSD (ANGSTROMS): ATOMS FOR RESIDUES 33-62: 0.55 ATOMS FOR RESIDUES 33-62: 1.1 BACKBONE ATOMS FOR RESIDUES 68-98: 0.7 HEAVY ATOMS FOR RESIDUES 68-98: 1.5	X-PLOR

NMR Ensemble Information
Conformer Selection Criteria	NO VIOLATION ABOVE 0.5 ANGSTROMS AND 5 DEGREE DIHEDRAL ANGLE
Conformers Calculated Total Number	50
Conformers Submitted Total Number	13

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	refinement	X-PLOR	3.851	BRUNGER
2	structure solution	X-PLOR	3.851