2KNN

Solution structure of the cyclotide cycloviolacin O2 with Glu6 methylated (cyO2Me)

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-1H TOCSY	1-2 mM cycloviolacin O2(Me)	90% H2O/10% D2O		5	ambient	303
2	2D DQF-COSY	1-2 mM cycloviolacin O2(Me)	90% H2O/10% D2O		5	ambient	303
3	2D 1H-1H NOESY	1-2 mM cycloviolacin O2(Me)	90% H2O/10% D2O		5	ambient	303
4	2D 1H-1H TOCSY	1-2 mM cycloviolacin O2(Me)	100% D2O		5	ambient	303
5	2D 1H-1H NOESY	1-2 mM cycloviolacin O2(Me)	100% D2O		5	ambient	303
6	2D 1H-1H TOCSY	1-2 mM cycloviolacin O2(Me)	90% H2O/10% D2O		5	ambient	303
7	2D 1H-1H NOESY	1-2 mM cycloviolacin O2(Me)	90% H2O/10% D2O		5	ambient	303

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

NMR Refinement
Method	Details	Software
simulated annealing	Structures were generated using torsion angle dynamics within the program CNS and refined and energy minimised using Cartesian dynamics in explicit water.	VNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	50
Conformers Submitted Total Number	20
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR	6.1	Varian
2	processing	VNMR	6.1	Varian
3	data analysis	CARA		Keller and Wuthrich
4	chemical shift assignment	CARA		Keller and Wuthrich
5	structure solution	CYANA	2.0	Guntert, Mumenthaler and Wuthrich
6	refinement	CNS	1.2	Brunger, Adams, Clore, Gros, Nilges and Read

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.