Experiment: 1D8V

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	3D_15N-SEPARATED_NOESY	~0.7 MM PROTEIN MAP30 (15N/13C) ENRICHED.		10 mM NAPI	5.50	1 atm	313.00
2	4D_13C/15N-SEPARATED_ NOESY	~0.7 MM PROTEIN MAP30 (15N/13C) ENRICHED.		10 mM NAPI	5.50	1 atm	313.00
3	3D_13C-SEPARATED_ NOESY	~0.7 MM PROTEIN MAP30 (15N/13C) ENRICHED.		10 mM NAPI	5.50	1 atm	313.00
4	4D_13C-SEPARATED_ NOESY	~0.7 MM PROTEIN MAP30 (15N/13C) ENRICHED.		10 mM NAPI	5.50	1 atm	313.00
5	HNHA	~0.7 MM PROTEIN MAP30 (15N/13C) ENRICHED.		10 mM NAPI	5.50	1 atm	313.00
6	HNCA-J	~0.7 MM PROTEIN MAP30 (15N/13C) ENRICHED.		10 mM NAPI	5.50	1 atm	313.00

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DMX	500
2	Bruker	DMX	600
3	Bruker	DMX	750

NMR Refinement
Method	Details	Software
simulated annealing	WE CALCULATED THE STRUCTURE OF MAP30 USING SIMULATED ANNEALING IN TORSION ANGLE SPACE STARTING FROM AN EXTENDED STRAND, FOLLOWED BY SIMULATED ANEALING IN CARTESIAN SPACE USING A MODIFIED XPLOR 3.5, CONTAINING PSEUDOPOTENTIALS FOR RESIDUAL DIPOLAR COUPLING AND A CONFORMATIONAL DATABASE. HYDROGEN BOND CONSTRAINTS, TWO FOR EACH HYDROGEN BOND (NH-O = 1.5-2.8 A AND N-O = 2.4-3.5 A), WERE DERIVED FROM NH EXCHANGE EXPERIMENTS, BACKBONE NOE PATTERNS, BACKBONE CA/CB CHEMICAL SHIFTS AND DIRECT MEASUREMENTS OF 3HJNC CONNECTIVITY ACROSS HYDROGEN BONDS, AND APPLIED IN THE LATER STAGE OF THE STRUCTURE CALCULATION. PHI AND PSI ANGLES WERE DERIVED FROM THREE-BOND 3JHNHA COUPLING CONSTANTS, MEASURED WITH THE 3D HNHA EXPERIMENT AND A DATABASE ANALYSIS OF BACKBONE (1H, 15N, 13CA, 13CB AND C) CHEMICAL SHIFTS, USING THE PROGRAM TALOS. THE PHI DIHEDRAL ANGLE WAS RESTRAINED TO -60 DEGREES PLUS-MINUS 30 DEGREES IF JHNHA < 5.5 HZ OR TO 110 DEGREES PLUS-MINUS 50 DEGREES IF JHNHA >8.0 HZ. CHI 1 DIHEDRAL ANGLES AND STEREOSPECIFIC ASSIGNMENTS OF BETA- METHYLENE PROTONS WERE DERIVED FROM JHNHB AND JHAHB SCALAR COUPLING CONSTANTS OBTAINED FROM 3D HNHB AND HACAHB-COSY EXPERIMENTS. TIGHT TURNS CLEARLY IDENTIFIED BY NOE PATTERNS AND J-COUPLING CONSTANTS, PHI AND PSI ANGLES WERE RESTRAINED TO THEIR STANDARD VALUES WITH PLUS-MINUS 30 DEGREES ERROR RANGE. FOR RESIDUES HAVING INTENSE INTRARESIDUE HN-HA NOES WITH POSITIVE PHI ANGLES SUGGESTED BY THE PROGRAM TALOS, PHI WAS RESTRAINED TO 40 DEGREES PLUS-MINUS 15 DEGREES. ELECTROSTATIC SURFACES WERE CALCULATED USING GRASP. MOLECULAR MODELS WERE GENERATED WITH QUANTA (MSI), INSIGHT (MSI) AND MOLSCRIPT.	MODIFIED X-PLOR

NMR Ensemble Information
Conformer Selection Criteria
Conformers Calculated Total Number
Conformers Submitted Total Number	1
Representative Model	1 (n/a)

Additional NMR Experimental Information
Details	THIS STRUCTURE WAS DETERMINED USING DIPOLAR COUPLING MEASURED IN LIQUID CRYSTAL MEDIA. IN ADDITION, WE ALSO MEASURED HYDROGEN BONDS DIRECTLY AND USED THEM IN STRUCTURE CALCULATIONS.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	refinement	MODIFIED X-PLOR	3.5	BRUNGER
2	structure solution	MODIFIED X-PLOR	3.5	BRUNGER

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.