1HTX | pdb_00001htx

SOLUTION STRUCTURE OF THE MAIN ALPHA-AMYLASE INHIBITOR FROM AMARANTH SEEDS

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	DQF-COSY	1.8 mM AAI, 0.05 mM NaN3	90% H2O/10% D2O		2.95	ambient	277
2	DQF-COSY	1.8 mM AAI, 0.05 mM NaN3	100% D2O		2.95	ambient	277
3	TOCSY	1.8 mM AAI, 0.05 mM NaN3	90% H2O/10% D2O		2.95	ambient	277
4	TOCSY	1.8 mM AAI, 0.05 mM NaN3	90% H2O/10% D2O		2.95	ambient	277
5	2D NOESY	1.8 mM AAI, 0.05 mM NaN3	90% H2O/10% D2O		2.95	ambient	277
6	2D NOESY	1.8 mM AAI, 0.05 mM NaN3	100% D2O		2.95	ambient	277

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE	600
2	Bruker	AMX	500
3	Varian	UNITY	600

NMR Refinement
Method	Details	Software
simulated annealing	restrained MD at 1000K follwed by stepwise cooling to 300K and final restrained energy optimisation	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with favorable non-bond energy,structures with the least restraint violations
Conformers Calculated Total Number	100
Conformers Submitted Total Number	20
Representative Model	1 (n/a)

Additional NMR Experimental Information
Details	This structure was determined from 2D 1H NMR techniques only using the sequence specific resonance assignment procedure, followed by NOE and J data collection, calculation bij X-plor and refinement with MSI's CVFF forcefield

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	XwinNMR	2.5	Bruker
2	collection	VNMR		Varian
3	structure solution	X-PLOR	3.1	Nilges, M.
4	refinement	NMR_Refine	98.0	MSI

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 R01GM157729.