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THE RESTRAINED AND MINIMIZED AVERAGE NMR STRUCTURE OF MAP30.
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.