1CJG

NMR STRUCTURE OF LAC REPRESSOR HP62-DNA COMPLEX

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	SEE ARTICLE	SEE ARTICLE		SEE ARTICLE	6.1	1 atm	315

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1			500
2			600
3			750

NMR Refinement
Method	Details	Software
SIMULATED ANNEALING FOLLOWED BY RESTRAINED MD	THE STRUCTURES WERE DETERMINED BY FIRST CALCULATING THE STRUCTURE OF THE HP62 MONOMER USING THE STANDARD XPLOR PARAMETER SETS FOR NMR STRUCTURE DETERMINATION. THE HP62 MONOMERS WERE SUBSEQUENTLY DUPLICATED AND DOCKED ONTO A B-DNA TEMPLATE STRUCTURE OF THE LAC OPERATOR, WHICH WAS ALLOWED TO BEND IN ORDER TO ACCOMODATE THE TWO HP62 MONOMERS. THE PROPERLY DOCKED STRUCTURES WERE PLACED IN A TIP3P WATERBOX WHICH WAS NEUTRALIZED BY ADDITION OF SODIUM-IONS. THE STRUCTURES WERE THEN FURTHER REFINED BY A RESTRAINED MD SIMULATION OF 24 PS IN THE CHARMM22 FORCEFIELD FOR PROTEINS AND NUCLEIC ACIDS. NCS SYMMETRY RESTRAINTS WERE USED DURING THE DOCKING AND REFINEMENT PROCEDURES. FOR FURTHER REFINEMENT DETAILS SEE THE PAPER DESCRIBING THE STRUCTURES	X-PLOR

NMR Ensemble Information
Conformer Selection Criteria	SEE ARTICLE
Conformers Calculated Total Number	14
Conformers Submitted Total Number	11

Additional NMR Experimental Information
Details	RESONANCE ASSIGNMENTS WERE BASED ON VARIOUS HOMONUCLEAR AND DOUBLE AND TRIPLE RESONANCE NMR EXPERIMENTS IN H2O/D2O (95%/5%) AND D2O. IN ADDITION ISOTOPE FILTER EXPERIMENTS WERE APPLIED TO OBTAIN ADDITIONAL ASSIGNMENTS AND TO ASSIGN INTER-MOLECULAR NOES. FOR FURTHER DETAILS SEE THE REFERENCE DESCRIBING THE STRUCTURES

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