1RO4

RDC-derived models of the zinc ribbon domain of human general transcription factor TFIIB (zinc free structures)

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-15N HSQC	0.6mM TFIIB Uniform labeling with 15N: U-98% 15N, 20mM [2H4]-imidazole hydrochloride, 5% glycerol and 20mM sodium sulfate at pH 6.5	95% H2O/5% D2O		6.5	ambient	298
2	2D 1H-15N IPAP HSQC	0.6mM TFIIB Uniform labeling with 15N: U-98% 15N, 20mM [2H4]-imidazole hydrochloride, 5% glycerol and 20mM sodium sulfate at pH 6.5, 12mg/mL of filamentous phage, Pf1	95% H2O/5% D2O		6.5	ambient	298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	INOVA	600

NMR Refinement
Method	Details	Software
simulated annealing	the structures are based on a total of 465 restraints, 443 are distance constraints, 22 1H-15N RDC restraints	VNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations, structures with the lowest energy
Conformers Calculated Total Number	35
Conformers Submitted Total Number	35

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR	6.1C	Varian
2	processing	NMRPipe	2.1	Frank Delaglio
3	data analysis	NMRView	5.0	Bruce A. Johnson
4	structure solution	CNS	1.1	Brunger
5	refinement	CNS	1.1	Brunger

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 R01GM133198.