Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M
Radiation wavelength
Relative weight: 1
NMR spectrometer
Type: Bruker DMX / Manufacturer: Bruker / Model: DMX / Field strength: 750 MHz
-
Processing
NMR software
Name
Version
Developer
Classification
DYANA
1.5
P. Guentert
refinement
XwinNMR
2.6
Bruker
collection
XEASY
1.3.11
C. Bartels
dataanalysis
Refinement
Method: torsion angle dynamics / Software ordinal: 1 Details: Structures are based on a total of 333 distance constraints. This includes 6 upper and 6 lower limits defining 3 disulfide bonds, as well as 3 upper and 3 lower limits defining a peptide ...Details: Structures are based on a total of 333 distance constraints. This includes 6 upper and 6 lower limits defining 3 disulfide bonds, as well as 3 upper and 3 lower limits defining a peptide bond cyclizing the peptide backbone. Residue numbering follows the original description of citation 1, except that for the purposes of structure calculations, the N-terminal residue was taken as Asn8. Therefore, residues 30-36 in this deposition correspond to residues 1-7 in citation 1 and related PDB entry 1kal. Structures were refined in the absence of any artificial constraints defining disulfide bonds until all NOEs had been assigned and low target functions were achieved (tf=0.6). 15 additional calculations were performed with these input data and the inclusion of constraints defining all possible disulfide pairing combinations. The structures containing disulfides between [5(34)-13], [17-29] and [22-27] displayed the lowest target function (0.74, second lowest was 1.54). On the basis of this result and analysis of NOEs observed between Cys sidechain protons, this disulfide bonding arrangement was assumed to be correct and served as the basis for this deposition.
NMR ensemble
Conformer selection criteria: target function / Conformers calculated total number: 50 / Conformers submitted total number: 20
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