1F7I

SOLUTION STRUCTURE OF THE RNASE P RNA (M1 RNA) P4 STEM C70U MUTANT OLIGORIBONUCLEOTIDE COMPLEXED WITH COBALT (III) HEXAMINE ,NMR, ENSEMBLE OF 12 STRUCTURES


SOLUTION NMR Experimental Data


Experimental Details
Sample Conditions
Sample Contents2 mM P4m RNA; 100 mM sodium chloride; 10 mM phosphate buffer; 90% H2O, 10% D2O
Solvent90% H2O, 10% D2O
Ionic Strength100 mM Na
pH6.5
Pressureambient
Temperature (K)288
Experiment(s):2D NOESY
Sample Contents2 mM P4m RNA; 100 mM sodium chloride; 10 mM phosphate buffer; 99.96% D2O
Solvent99.96% D2O
Ionic Strength100 mM Na
pH6.5
Pressureambient
Temperature (K)288
Experiment(s):2D NOESY, DQF-COSY, 31P-1H-COSY, 13C-1H-HMQC
Sample Contents2 mM P4m RNA; 100 mM sodium chloride; 10 mM magnesium chloride; 10 mM phosphate buffer; 90% H2O, 10% D2O
Solvent90% H2O, 10% D2O
Ionic Strength100 mM Na, 10 mM Mg
pH6.5
Pressureambient
Temperature (K)288
Experiment(s):2D NOESY
Sample Contents2 mM P4m RNA; 100 mM sodium chloride; 3 mM hexammine cobalt chloride; 10 mM phosphate buffer; 90% H2O, 10% D2O
Solvent90% H2O, 10% D2O
Ionic Strength100 mM Na, 3 mM Co(NH3)6
pH6.5
Pressureambient
Temperature (K)288
Experiment(s):2D NOESY
Spectrometer Information
Manufacturer Model Field Strength
Bruker DRX 500.0
Bruker AMX 600.0
NMR Refinement
Method restrained molecular dynamics; simulated annealing
Details The structures are based on a total of 268 NOE derived distance constraints, 171 dihedral restraints and 49 distance restraints from hydrogen bonds. 12 NOE derived intermolecular distance constraints were used to localize the bound cobalt(III) hexammine. The 12 structures with lowest NOE and dihedral angle violation energies are presented
NMR Ensemble Information
Conformer Selection Criteria structures with the least restraint violations
Conformers Calculated Total Number 50
Conformers Submitted Total Number 12
Representative Model Choice Rationale
1 closest to the average
Additional NMR Experimental Information
1 This structure was determined using standard 2D homonuclear techniques and 13C and 31P heteronuclear techniques at natural abundance. Distance constraints derived from intermolecular NOE crosspeaks between RNA protons and cobalt (III) hexammine protons were used to determine the site of cobalt (III) hexammine binding in the complex structure
Computation: NMR Software
# Classification Software Name Author
1 refinement X-PLOR 3.841 Brunger
2 structure solution X-PLOR 3.841 Brunger
3 processing FELIX 95 MSI
4 collection XWINNMR 3.1 Bruker