SOLUTION NMR Experimental Data


Experimental Details
Sample Conditions
Sample Contents~0.7 MM PROTEIN MAP30 (15N/13C) ENRICHED.
Solventn/a
Ionic Strength10 MM NAPI
pH5.50
Pressure1
Temperature (K)313.00
Experiment(s):3D_15N-SEPARATED_NOESY, 4D_13C/15N-SEPARATED_ NOESY, 3D_13C-SEPARATED_ NOESY, 4D_13C-SEPARATED_ NOESY, HNHA, HNCA-J
Spectrometer Information
Manufacturer Model Field Strength
BRUKER DMX 750.0
BRUKER DMX 600.0
BRUKER DMX 500.0
NMR Refinement
Method SIMULATED ANNEALING
Details 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.
NMR Ensemble Information
Conformers Submitted Total Number 1
Representative Model Choice Rationale
1 n/a
Additional NMR Experimental Information
1 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 Software Name Author
1 structure solution MODIFIED X-PLOR 3.5 BRUNGER
2 refinement MODIFIED X-PLOR 3.5 BRUNGER