Experiment: 2L9I

NMR structure of thymosin alpha-1

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-1H NOESY	28.8 mg Thymosin-Alpha1, 40 % TFE	10% D2O, 50% H2O	0	4.9	ambient	298
2	2D 1H-1H TOCSY	28.8 mg Thymosin-Alpha1, 40 % TFE	10% D2O, 50% H2O	0	4.9	ambient	298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	UNITYPLUS	800

NMR Refinement
Method	Details	Software
molecular dynamics, restrained molecular dynamics, restrained molecular dynamics and selection, average structure	25 ns at 300K on a explicit solvent ratio 40% TFE/H2O (v/v), with a linear-helix initial structure, After the 25 ns on explicit solvent, 1 ns GB simulation follows with all (549)restrains at 300K., After the 1ns GB restrained simulation, a 10ns restrained MD simulation follows on a explicit solvent ratio 40% TFE/water (v/v). 1000 structures were collected (1 every 10ps), minimized and sorted by total energy. The best 20 structures with the lowest energy were selected., The average structure was obtained from the average of the 20 best structures with the lowest energy and minimized with the 549 restraints and the GB method in order to taking in account the salvation implicitly.	Amber

NMR Ensemble Information
Conformer Selection Criteria	1 average structure + 20 structures with the lowest energy
Conformers Calculated Total Number	1000
Conformers Submitted Total Number	21
Representative Model	1 (average structure)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	molecular dynamics	Amber	9.0	Case, Darden, Cheatham, III, Simmerling, Wang, Duke, Luo, and Kollm
2	minimization	Amber	9.0	Case, Darden, Cheatham, III, Simmerling, Wang, Duke, Luo, and Kollm
3	data analysis	Amber	9.0	Case, Darden, Cheatham, III, Simmerling, Wang, Duke, Luo, and Kollm
4	refinement	Amber