1Q68

Solution structure of T-cell surface glycoprotein CD4 and Proto-oncogene tyrosine-protein kinase LCK fragments

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	HNCA, HN(CO)CA, HNCACB, HN(CO)CACB, CCONH, HCCONH, HCCH TOCSY	0.5 mM CD4-Lck-Zn2+, U-15N,13C; 20 mM acetate, 20 mM NaCl, 0.15% beta-mercaptoethanol	95% H2O/5% D2O		5.1	ambient	298
2	15N-NOESY, 15N-TOCSY	0.5 mM CD4-Lck-Zn2+, U-15N; 20 mM acetate, 20 mM NaCl, 0.15% beta-mercaptoethanol	95% H2O/5% D2O		5.1	ambient	298
3	D2O NOESY, D2O TOCSY	0.5 mM CD4-Lck-Zn2+; 20 mM acetate, 20 mM NaCl, 0.15% beta-mercaptoethanol	100% D2O		5.1	ambient	298
4	Cd-H HMQC, Cd-H NOESY-HMQC	1.0 mM CD4-Lck-Cd2+; 20 mM acetate, 20 mM NaCl, 0.15% beta-mercaptoethanol	100% D2O		5.1	ambient	298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE	500
2	Varian	INOVA	750

NMR Refinement
Method	Details	Software
distance geometry, simulated annealing, molecular dynamics, torsion angle dynamics	The structures are based on a total of 419 distance restraints (406 NOEs, four Zn-S restraints from Cd-H HMQC experiments, nine hydrogen bonds) and 63 angle restraints (57 dihedral angle restraints, six S-Zn-S angle restraints from Cd-H HMQC experiments).	Felix

NMR Ensemble Information
Conformer Selection Criteria	The submitted conformer models are the 10 structures with the lowest energy.
Conformers Calculated Total Number	100
Conformers Submitted Total Number	10
Representative Model	1 (noe limit 0.5 angstrom, angle violation 5 degrees)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	processing	Felix		Molecular Simulations Inc.
2	structure solution	DYANA		Guntert, Wuthrich
3	structure solution	X-PLOR		Brunger
4	refinement	X-PLOR		Brunger