1WCR

Trimeric Structure of the Enzyme IIA from Escherichia coli Phosphotransferase System Specific for N,N'-Diacetylchitobiose

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	(1) TROSY TRIPLE RESONANCE FOR ASSIGNMENT OF PROTEIN			10MM SODIUM PHOSPHATE	6.5	1.0 atm	303.0
2	(2) QUANTITATIVE J CORRELATION FOR SIDECHAIN COUPLING CONSTANTS			10MM SODIUM PHOSPHATE	6.5	1.0 atm	303.0
3	(3) 3D			10MM SODIUM PHOSPHATE	6.5	1.0 atm	303.0
4	4D HETERONUCLEAR SEPARATED NOE EXPTS			10MM SODIUM PHOSPHATE	6.5	1.0 atm	303.0
5	(4) TROSY HNCO AND HN(CO)CA EXPERIMENTS FOR DIPOLAR COUPLINGS. DIPOLAR COUPLINGS WERE MEASURED IN PF1 PHAGE			10MM SODIUM PHOSPHATE	6.5	1.0 atm	303.0

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DMX	500
2	Bruker	DMX	600
3	Bruker	DRX	600
4	Bruker	DMX	750
5	Bruker	DRX	800

NMR Refinement
Method	Details	Software
SIMULATED ANNEALING IN TORSION ANG SPACE	THE TARGET FUNCTION COMPRISES TERMS FOR THE NOE-DERIVED INTERPROTON DISTANCE RESTRAINTS, TORSION ANGLE RESTRAINTS, 13CALPHA/BETA CHEMICAL SHIFT RESTRAINTS, AND RESIDUAL DIPOLAR COUPLING RESTRAINTS (N-H, N-C' AND C'-CA). NON-BONDED INTERACTIONS ARE REPRESENTED BY A QUARTIC VAN DER WAALS REPULSION TERM, TORSION ANGLE AND HYDROGEN BONDING DATABASE POTENTIALS OF MEAN FORCE, AND A RADIUS OF GYRATION RESTRAINT. IN THIS ENTRY THE LAST COLUMN REPRESENTS THE AVERAGE ATOMIC RMS DIFFERENCE IN ANGSTROMS BETWEEN THE 80 INDIVIDUAL SIMULATED ANNEALING STRUCTURES AND THE MEAN COORDINATES RESIDUES 1-3, 61-69 AND 102-103 ARE DISORDERED IN SOLUTION.	Xplor-NIH

NMR Ensemble Information
Conformer Selection Criteria	RESTRAINED REGULARIZED MEAN STRUCTURE
Conformers Calculated Total Number	100
Conformers Submitted Total Number	1

Additional NMR Experimental Information

Details

EXPERIMENTAL RESTRAINTS: 1290 INTERPROTON DISTANCE RESTRAINTS: 246 SEQUENTIAL, 258 MEDIUM-RANGE, 90 LONG-RANGE INTRAMOLECULAR RESTRAINTS; 234 INTERMOLECULAR DISTANCE RESTRAINTS; 462 DISTANCE RESTRAINTS FOR BACKBONE H-BONDS FOR 231 H-BONDS (71 PER SUBUNIT) 729 TORSION ANGLE RESTRAINTS (255 PHI, 255 PSI, 219 CHI) 585 CALPHA/CBETA CHEMICAL SHIFT RESTRAINTS 759 RESIDUAL DIPOLAR COUPLING RESTRAINTS (252 N-H, 255 N-C', 249 C'-CA) DIPOLAR COUPLING R-FACTORS FOR THE RESTRAINED REGULARIZED MEAN STRUCTURE N-H 7.1% N-C' 15.2% C'-CA 17.7%

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	refinement	Xplor-NIH	(HTTP://NMR.CIT.NIH.GOV/XPLOR_NIH)	SCHWIETERS, KUSZEWSKI, TJ
2	structure solution	Xplor-NIH