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The solution structure of antigen MPT64 from Mycobacterium tuberculosis defines a novel class of beta-grasp proteins
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
5N-edited NOESY
2.0 mM recombinant MPT64 (15N-enriched), saturated d13-MES pH 6.9 with 5% D2O, 0.2 mM DSS, 1mM NaN3
no salt
6.9
303
2
NHSQC
2.0 mM recombinant MPT64 (15N-enriched), saturated d13-MES pH 6.9 with 5% D2O, 0.2 mM DSS, 1mM NaN3
no salt
6.9
303
3
13C-edited NOESY (aliphatic and aromatic)
2.0 mM recombinant MPT64 (13C-enriched), saturated d13-MES pH 6.9 with 99% D2O, 0.2 mM DSS, 1mM NaN3
no salt
6.9
303
4
HNCA
2.0 mM recombinant MPT64 (15N,13C), saturated d13-MES pH 6.9 with 5% D2O, 0.2 mM DSS, 1mM NaN3
no salt
6.9
303
5
CBCA(CO)NH
2.0 mM recombinant MPT64 (15N,13C), saturated d13-MES pH 6.9 with 5% D2O, 0.2 mM DSS, 1mM NaN3
no salt
6.9
303
6
HNCACB
2.0 mM recombinant MPT64 (15N,13C), saturated d13-MES pH 6.9 with 5% D2O, 0.2 mM DSS, 1mM NaN3
no salt
6.9
303
7
HNCO
2.0 mM recombinant MPT64 (15N,13C), saturated d13-MES pH 6.9 with 5% D2O, 0.2 mM DSS, 1mM NaN3
no salt
6.9
303
8
(HCA)CO(CA)NH (Varian BioPack Software Package)
2.0 mM recombinant MPT64 (15N,13C), saturated d13-MES pH 6.9 with 5% D2O, 0.2 mM DSS, 1mM NaN3
no salt
6.9
303
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Varian
INOVA
600
NMR Refinement
Method
Details
Software
Torsion Angle Dynamics followed by RDC refinement using CNS 1.1
The initial structures were calculated through TAD protocol of CNS with 3761 NOE-derived distance contraints and 292 dihedral angle restraints. The final structures were refined using JNH and JCaCO Residual Dipolar Coupling (RDC) in Cartesian space with same NOE, dihedral angle restraints and 139 JNH RDCs and 114 JCaCO RDCs from stretched gel.