Experiment: 2RVQ

Solution structure of the isolated histone H2A-H2B heterodimer

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	TROSY-HN(CO)CACB	0.1-0.3 mM [U-13C; U-15N; U-2H] entity_1-1, 0.1-0.3 mM [U-13C; U-15N; U-2H] entity_2-2	90% H2O/10% D2O	400	6.0	ambient	293
2	TROSY-HNCACB	0.1-0.3 mM [U-13C; U-15N; U-2H] entity_1-1, 0.1-0.3 mM [U-13C; U-15N; U-2H] entity_2-2	90% H2O/10% D2O	400	6.0	ambient	293
3	TROSY-HN(CA)CO	0.1-0.3 mM [U-13C; U-15N; U-2H] entity_1-1, 0.1-0.3 mM [U-13C; U-15N; U-2H] entity_2-2	90% H2O/10% D2O	400	6.0	ambient	293
4	TROSY-HNCO	0.1-0.3 mM [U-13C; U-15N; U-2H] entity_1-1, 0.1-0.3 mM [U-13C; U-15N; U-2H] entity_2-2	90% H2O/10% D2O	400	6.0	ambient	293
5	HCCCONH	0.1-0.3 mM [U-13C; U-15N; U-2H] entity_1-1, 0.1-0.3 mM [U-13C; U-15N; U-2H] entity_2-2	90% H2O/10% D2O	400	6.0	ambient	293
6	TROSY-1H-15N HSQC	0.1-0.3 mM [U-13C; U-15N; U-2H] entity_1-1, 0.1-0.3 mM [U-13C; U-15N; U-2H] entity_2-2	90% H2O/10% D2O	400	6.0	ambient	293
7	TROSY-1H-13C HSQC	0.1-0.3 mM [U-13C; U-15N; U-2H] entity_1-1, 0.1-0.3 mM [U-13C; U-15N; U-2H] entity_2-2	90% H2O/10% D2O	400	6.0	ambient	293

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE	600
2	Bruker	AVANCE	800

NMR Refinement
Method	Details	Software
CS-Rosetta-AbinitioRelax, CS-Rosetta-FloppyTail	The structure of the core regions of H2A(Val27-Leu96) and H2B (Ser38-Lys125) connected by a random coil (Gly)16 poly-glycine linker was modeled by CS-Rosetta-AbinitioRelax protocol.In total 10,000 models were generated and selected the 10 models with the lowest CA-RMSD from the 20 models with the lowest CS-Rosetta energy., After the (Gly)16 poly-glycine linker was removed from each of the 10 selected structures of the H2A-H2B core, the flexible tails of H2A (Gly(-3)-Pro26 and Leu97-Lys129) and H2B (Gly(-3)-Tyr37) were connected by using MODELLER program. Next, for each of the three flexible tails,CS-Rosetta-FloppyTail protocol was used to generate 10,000 models for each of the 10 selected core structures, and selected one model with the lowest kai2 values of chemical shifts.	CS-ROSETTA

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	10000
Conformers Submitted Total Number	10
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	geometry optimization	CS-ROSETTA		Shen, Vernon, Baker and Bax
2	refinement	CS-ROSETTA		Shen, Vernon, Baker and Bax