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Solution structure of the SecA-signal peptide complex
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
13C-HMQC
100%D2O
50 mM
7.5
1.0 atm
295.0
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Varian
INOVA
600
NMR Refinement
Method
Details
Software
SEMIRIGID AND FLEXIBLE SIMULATED ANNEALING
REFINEMENT DETAILS CAN BE FOUND IN THE JRNL CITATION ABOVE REFERENCE HADDOCK AUTH C. DOMIGUEZ, R. BOELENS, A.M.J.J. BONVIN TITLE HADDOCK A PROTEIN-PROTEIN DOCKING APPROACH BASED ON BIOCHEMICAL OR BIOPHYSICAL INFORMATION REF J.AM. CHEM.SOC,V125,P1731,2003 COORDINATES FOR E. COLI SECA (RESIDUES 9-228, 349-836)WERE OBTAINED FROM PDB ENTRY 2FSF. THE PREPROTEIN BINDING DOMAIN (RESIDUES 229-348) WAS MODELLED BASED ON THE AVAILABLE STRUCTURE OF T. THERMOPHILUS, CSI DATA AND NOES ON THE ISOLATED DOMAIN. TWO SINGLE CYSTEINE VARIANTS (POSITIONS 7 AND 25) WERE PREPARED AND CROSSLINKED WITH MTSL. PARAMAGNETIC RELAXATION ENHANCEMENT (PRE) VALUES FOR METHYL PROTONS OF VAL, LEU, ILE AND MET RESIDUES WERE QUANTIFIED FROM TWO 13C-HMQC SPECTRA (PARAMAGNETIC AND DIAMAGNETIC). PRES WERE CONVERTED TO DISTANCE RESTRAINTS, WHICH WERE USED FOR SUBSEQUENT STRUCTURE CALCULATION OF THE SECA-SIGNAL PEPTIDE COMPLEX.