1EZA

AMINO TERMINAL DOMAIN OF ENZYME I FROM ESCHERICHIA COLI NMR, RESTRAINED REGULARIZED MEAN STRUCTURE

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	TRIPLE RESONANCE FOR ASSIGNMENT OF PROTEIN; QUANTITATIVE J CORRELATION FOR COUPLING CONSTANTS 3D				7		313
2	4D HETERONUCLEAR SEPARATED NOE EXPERIMENTS. 3D 13C-SEPARATED/12C-FILTERED NOE EXPERIMENTS FOR REVERSE LABELED AROMATIC SAMPLES				7		313

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AMX500	500
2	Bruker	AMX600	600

NMR Refinement
Method	Details	Software
simulated annealing	THE 3D STRUCTURE OF THE EIN WAS SOLVED BY MULTI-DIMENSIONAL HETERONUCLEAR NMR AND IS BASED ON 4251 EXPERIMENTAL NMR RESTRAINTS: (A) INTRAPROTEIN: 952 SEQUENTIAL (\|I- J\|=1), 809 MEDIUM RANGE (1 < \|I-J\| <=5) AND 586 LONG RANGE (\|I-J\| >5) INTERRESIDUES AND 471 INTRARESIDUE APPROXIMATE INTERPROTON DISTANCE RESTRAINTS; 230 DISTANCES FOR 115 BACKBONE HYDROGEN BONDS; 140 TORSION ANGLE RESTRAINTS; 163 THREE-BOND HN-HA COUPLING CONSTANT RESTRAINTS; AND 498 (258 CALPHA AND 241 CBETA) 13C SHIFT RESTRAINTS. (NUMBERS OF RESIDUES 1 - 259). THE STRUCTURES WERE CALCULATED USING THE SIMULATED ANNEALING PROTOCOL OF NILGES ET AL. (1988) FEBS LETT. 229, 129-136 USING THE PROGRAM X-PLOR 3.1 (BRUNGER) MODIFIED TO INCORPORATE COUPLING CONSTANT (GARRETT ET AL. (1984) J. MAGN. RESON. SERIES B 104, 99-103) AND CARBON CHEMICAL SHIFT (KUSZEWSKI ET AL. (1995) J. MAGN. RESON. SERIES B 106, 92-96) RESTRAINTS, AND A CONFORMATIONAL DATABASE POTENTIAL (KUSZEWSKI ET AL.(1996) PROTEIN SCI. 5, 1067-1080 IN THE RESTRAINED REGULARIZED MEAN COORDINATES THE TEMPERATURE FACTOR FIELD REPRESENTS THE AVERAGE RMS DIFFERENCE BETWEEN THE INDIVIDUAL SIMULATED ANNEALING STRUCTURES AND THE MEAN COORDINATE POSITIONS. THE LAST COLUMN IN THE INDIVIDUAL SA STRUCTURES HAS NO MEANING. BEST FITTING TO GENERATE THE AVERAGE STRUCTURE IS WITH RESPECT TO RESIDUES 1 - 246 (RESIDUES 250 - 259 ARE DISORDERED IN SOLUTION) NOTE THE OCCUPANCY FIELD HAS NO MEANING.	X-PLOR (SEE ABOVE)

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

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	X-PLOR (SEE ABOVE)	ABOVE)
2	refinement	X-PLOR (SEE ABOVE)	ABOVE)

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.