Experiment: 2LTR

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-15N HSQC	200 uM [U-100% 15N] RDE-4DC	90% H2O/10% D2O	0.15	7.0	ambient	298
2	3D HNCO	500 uM [U-100% 13C; U-100% 15N; U-80% 2H] RDE-4DC	90% H2O/10% D2O	0.15	7.0	ambient	298
3	3D HNCA	500 uM [U-100% 13C; U-100% 15N; U-80% 2H] RDE-4DC	90% H2O/10% D2O	0.15	7.0	ambient	298
4	3D HN(COCA)CB	500 uM [U-100% 13C; U-100% 15N; U-80% 2H] RDE-4DC	90% H2O/10% D2O	0.15	7.0	ambient	298
5	3D HN(CO)CA	500 uM [U-100% 13C; U-100% 15N; U-80% 2H] RDE-4DC	90% H2O/10% D2O	0.15	7.0	ambient	298
6	3D HN(CA)CO	500 uM [U-100% 13C; U-100% 15N; U-80% 2H] RDE-4DC	90% H2O/10% D2O	0.15	7.0	ambient	298
7	3D HNCACB	500 uM [U-100% 13C; U-100% 15N; U-80% 2H] RDE-4DC	90% H2O/10% D2O	0.15	7.0	ambient	298
8	3D H(CCCO)NH TOCSY	500 uM [U-100% 15N; U-100% 13C; U-100% 2H] RDE-4DC with [U-100% 1H] Val, Leu, and Ile RDE-4DC	90% H2O/10% D2O	0.15	7.0	ambient	298
9	3D (H)C(CCO)NH TOCSY	500 uM [U-100% 15N; U-100% 13C; U-100% 2H] RDE-4DC with [U-100% 1H] Val, Leu, and Ile RDE-4DC	90% H2O/10% D2O	0.15	7.0	ambient	298
10	3D 1H-15N NOESY	200 uM [U-100% 15N] RDE-4DC	90% H2O/10% D2O	0.15	7.0	ambient	298
11	3D 1H-13C(Me-Only) NOESY	500 uM [U-100% 15N; U-100% 2H] RDE-4DC with [U-100% 13C-methyl] Val, Leu, and Ile (d1) and [U-100% 1H] Ile, Leu, Val and Phe RDE-4DC, 500 uM [U-100% 15N; U-100% 2H] RDE-4DC with [U-100% 13C-methyl] Val, Leu, and Ile (d1) and [U-100% 1H] Ile, Leu, Val and Tyr RDE-4DC	90% H2O/10% D2O	0.15	7.0	ambient	298
12	3D 1H-13C NOESY aromatic	500 uM [U-100% 15N; U-100% 2H] RDE-4DC with [U-100% 13C-methyl] Val, Leu, and Ile (d1) and [U-100% 1H] Ile, Leu, Val and Phe RDE-4DC, 500 uM [U-100% 15N; U-100% 2H] RDE-4DC with [U-100% 13C-methyl] Val, Leu, and Ile (d1) and [U-100% 1H] Ile, Leu, Val and Tyr RDE-4DC	90% H2O/10% D2O	0.15	7.0	ambient	298
13	2D 1H-13C HSQC	200 uM [U-10% 13C] RDE-4DC	90% H2O/10% D2O	0.15	7.0	ambient	298
14	2D 1H-13C HSQC	500 uM [U-100% 13C; U-100% 15N; U-80% 2H] RDE-4DC	90% H2O/10% D2O	0.15	7.0	ambient	298
15	2D 1H-13C HSQC	500 uM [U-100% 15N; U-100% 2H] RDE-4DC with [U-100% 13C-methyl] Val, Leu, and Ile (d1) and [U-100% 1H] Ile, Leu, Val and Phe RDE-4DC, 500 uM [U-100% 15N; U-100% 2H] RDE-4DC with [U-100% 13C-methyl] Val, Leu, and Ile (d1) and [U-100% 1H] Ile, Leu, Val and Tyr RDE-4DC	90% H2O/10% D2O	0.15	7.0	ambient	298
16	2D 1H-15N HSQC	200 uM [U-100% 15N] RDE-4DC	90% H2O/10% D2O	0.3	7.0	ambient	298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE	600

NMR Refinement
Method	Details	Software
simulated annealing	THE PROTEIN USED IN THIS STUDY (UNP RESIDUES 1-243) IS A FRAGMENT OF RDE-4, AN RNAI INITIATOR PROTEIN IN C. ELEGANS. IT CONSISTS OF FOUR REGIONS, WHICH ARE THE N-TERMINAL REGION (1-43), DSRBD1 (44-107), LINKER (108-168), AND DSRBD2 (169-235). IN THE COURSE OF ASSIGNMENTS AND STRUCTURE CALCULATION, A PART OF THE LINKER (RESIDUES 126-149) IS FOUND TO BE HIGHLY FLEXIBLE. NO SPATIAL INTER-DOMAIN CONTACTS WERE OBSERVED BETWEEN THE TWO DSRBDS. THEREFORE, SOLUTION STRUCTURES OF DSRBD1 AND DSRBD2 WERE CALCULATED SEPARATELY. FOR 2LTR, RIGID PART OF N-TERMINAL REGION (32-43), DSRBD1 (44-107) AND LINKER REGION (108-136) WERE USED TO CALCULATE THE FINAL STRUCTURES, WHEREAS FOR 2LTS, RIGID PART OF THE LINKER (150-168) AND DSRBD2 (169-235) WERE CHOSEN FOR THE CALCULATION OF THE FINAL STRUCTURES. THE RELATIVE ORIENTATION BETWEEN TWO STRUCTURES COULD NOT BE DETERMINED DUE TO THE FLEXIBLE NATURE OF THE LINKER.	X-PLOR NIH

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	100
Conformers Submitted Total Number	10
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	X-PLOR NIH		Schwieters, Kuszewski, Tjandra and Clore
2	structure validation	ProcheckNMR		Laskowski and MacArthur
3	collection	TopSpin		Bruker Biospin
4	chemical shift assignment	NMRView		Johnson, One Moon Scientific
5	chemical shift assignment	CARA		Keller and Wuethrich
6	refinement	X-PLOR NIH		Schwieters, Kuszewski, Tjandra and Clore

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.