ISDA: 1L1M

SOLUTION NMR

NMR Experiment

Experiment	Type	Sample Contents	Ionic Strength	Solvent	pH	Pressure	Temprature (K)
1	3D_13C-separated_NOESY	2mM Lac-HP62-V52C U-15N,13C, 10mM KPi, 20mM KCl, 90% H2O, 10% D2O	10mM KPi, 20mM KCl	90% H2O/10% D2O	6.0	ambient	315
2	3D_15N-separated_NOESY	2mM Lac-HP62-V52C U-15N,13C, 10mM KPi, 20mM KCl, 90% H2O, 10% D2O	10mM KPi, 20mM KCl	90% H2O/10% D2O	6.0	ambient	315
3	2D NOESY	2mM Lac-HP62-V52C U-15N,13C, 10mM KPi, 20mM KCl, 90% H2O, 10% D2O	10mM KPi, 20mM KCl	90% H2O/10% D2O	6.0	ambient	315

NMR Spectrometer Information

Spectrometer	Manufacturer	Model	Field Strength

NMR Refinement

Method	Details	Software
SIMULATED ANNEALING FOLLOWED BY RESTRAINED MDR	The structure of the complex was calculated as follows. First the structure of the dimeric lac HP62-V52C was calculated using only protein NMR restraints. The 50 best structures were selected and docked onto the natural lac operator B-DNA using simulated annealing. Distance and planarity restraints for the DNA were incorporated in order to keep DNA close to B-DNA but allowing a bend necessary to accommodate the two headpiece molecules on the DNA.	1

NMR Ensemble Information

Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	100
Conformers Submitted Total Number	20
Representative Model	1 (closest to the average)

Computation: NMR Software

#	Classification	Version	Software Name	Author
1	collection	3.1	XwinNMR	Bruker
2	processing	1.0	NMRPipe	Delaglio
3	data analysis	5.0.4	NMRView	Johnson
4	structure solution	1.1	CNS	Brunger
5	refinement	1.1	CNS	Brunger