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N-TERMINAL DOMAIN OF ESCHERICHIA COLI ARGININE REPRESSOR NMR, 23 STRUCTURES
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
2QF-COSY
5.8
301
2
3QF-COSY
5.8
301
3
E-COSY
5.8
301
4
CLEAN TOCSY
5.8
301
5
NOESY
5.8
301
6
HNHB
5.8
301
7
13C-HMBC
5.8
301
8
TOCSY-15N-HSQC
5.8
301
9
NOESY-15N-HSQC
5.8
301
10
3D HNCO
5.8
301
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Bruker
DMX600
600
NMR Refinement
Method
Details
Software
simulated annealing
STRUCTURES WERE CALCULATED WITH A MODIFIED VERSION OF X-PLOR WITH A SIMULATED ANNEALING PROTOCOL. AN AUTOMATED PROCEDURE (ARIA) WAS USED TO AUTOMATICALLY CALIBRATE, SELECT AND ASSIGN PEAK LISTS FROM HOMONUCLEAR H2O AND D2O AND N15-EDITED 3D NOESY SPECTRA. 20 STRUCTURES WERE ITERATIVELY REFINED, AND THE NOE DATA RE-ASSIGNED ON THE BASIS OF THE 7 LOWEST ENERGY STRUCTURES IN EACH ITERATION. THE AUTOMATICALLY GENERATED ASSIGNMENTS WERE CHECKED MANUALLY AND CORRECTED IF NECESSARY. THE FINAL LIST OF RESTRAINTS CONTAINED 2008 UNAMBIGUOUS RESTRAINTS AND 280 AMBIGUOUS RESTRAINTS WITH MAXIMALLY 5 ASSIGNMENT POSSIBILITIES. WITH THE FINAL RESTRAINT LIST, A TOTAL OF 75 STRUCTURES WERE CALCULATED. THE 23 STRUCTURES WITH THE LOWEST TOTAL ENERGY WERE REFINED IN AN EXPLICIT SHELL OF WATER. THE STRUCTURAL STATISTICS GIVEN BELOW ARE FOR THE STRUCTURES AFTER THE REFINEMENT IN WATER. REFINEMENT DETAILS CAN BE FOUND IN THE JRNL REFERENCE ABOVE. THE 23 DEPOSITED STRUCTURES ARE IN ORDER OF RISING RESTRAINT ENERGY AFTER WATER REFINEMENT. NOES TO ALL PROCHIRAL GROUPS WERE TREATED WITH A FLOATING CHIRALITY APPROACH THAT ALLOWS EXPLICIT SWAPPING OF PROTONS AND METHYL GROUPS; THE ATOM NAMES IN THE COORDINATE ENTRY HAVE BEEN RENAMED TO BE CONSISTENT WITH STANDARD IUB/IUPAC CONVENTION.