1ZXA

Solution Structure of the Coiled-Coil Domain of cGMP-dependent Protein Kinase Ia

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	TROSY version of HNCA, HNCACB, HNCACO	1 mM cGK1a(1-59) U-15N,13C, 85%-2H, 20 mM phosphate buffer NA, 10 mM NaCl, 1 mM EDTA, 5 mM DTT, 1 mM azide, 95% H2O, 5% D2O	95% H2O/5% D2O	30 mM salt	7.0	ambient	303
2	2D 1H-15N Spin Echo Difference Experiments for 3-bond Jcc and Jnc measurement	1 mM cGK1a(1-59) U-15N,13C, 85%-2H, 20 mM phosphate buffer NA, 10 mM NaCl, 1 mM EDTA, 5 mM DTT, 1 mM azide, 95% H2O, 5% D2O	95% H2O/5% D2O	30 mM salt	7.0	ambient	303
3	Standard HNCO-based 3D experiments for measuring one-bond J(NH), J(NC'), and J(C'Ca)	1 mM cGK1a(1-59) U-15N,13C, 85%-2H, 20 mM phosphate buffer NA, 10 mM NaCl, 1 mM EDTA, 5 mM DTT, 1 mM azide, 95% H2O, 5% D2O	95% H2O/5% D2O	30 mM salt	7.0	ambient	303
4	Standard HNCO-based 3D experiments for measuring one-bond D(NH), D(NC'), and D(C'Ca)	1 mM cGK1a(1-59) U-15N,13C, 85%-2H, 20 mM phosphate buffer NA, 10 mM NaCl, 1 mM EDTA, 5 mM DTT, 1 mM azide, 15 mg/ml Pf1, 95% H2O, 5% D2O	95% H2O/5% D2O	30 mM salt	7.0	ambient	303
5	Standard 2D experiments for measuring 15N T1 and T2	1 mM cGK1a(1-59) U-15N,13C, 85%-2H, 20 mM phosphate buffer NA, 10 mM NaCl, 1 mM EDTA, 5 mM DTT, 1 mM azide, 95% H2O, 5% D2O	95% H2O/5% D2O	30 mM salt	7.0	ambient	303

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE	500
2	Bruker	DMX	600

NMR Refinement
Method	Details	Software
simulated annealing, RDC refinement and analysis	Structure determination consists of five steps. 1. Measure RDCs in Pf1 alignment medium. 2. Identify the coiled-coil motif by RDC-based molecular replacement analysis. 3) Define the subtle curvature and super-coiling of the constituent helices by RDC refinement 4) Assemble parallel and anti-parallel models of the coiled-coil dimer using knowledge-based inter-molecular distance restraints. 5) Derive the correct monomer-monomer orientation by comparing experimental RDCs with those predicted from the 3D charge distribution and shape of the alternative structural models.	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	all calculated structures submitted
Conformers Calculated Total Number	20
Conformers Submitted Total Number	20
Representative Model	20 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	XwinNMR	3.5	Bruker
2	processing	NMRPipe	2.2	Delaglio
3	refinement	XPLOR-NIH	2.9.9
4	structure solution	PALES	1	Zweckstetter