Find PDB structures and Computed Structure Models (CSM) by combining queries from tools in this suite: Attribute Search, Sequence Similarity, Sequence Motif, 3D Similarity, and 3D Motif with 'AND' logic.
This structure is determined mainly by residual dipolar couplings measured in A liquid crystalline Pf1 medium. The structure calculation scheme, described in the paper, is based on the idea of refining existing
structural models against dipolar couplings to derive thecorrect structure. Here a total of 323 backbone dipolar couplings are used
to refine the backbone structure. Additionally, 38 sidechain dipolar
couplings and 85 3-bond J couplings are used to determine the sidechain
chi1 and chi2 rotamers as well as the presence of rotameric averaging. A total of three structures (model 1-3) were calculated starting from the 1.
A crystal structure of Ca-calmodulin (PDB entry 1EXR), the NMR structure of apo-calmodulin (1F70), and the crystal structure of Ca-ligated parvalbumin (1CDP). The convergence of refinement is indicated by the small average RMSD between the three calculated structures and the average
coordinates (0.28 A for backbone and 0.87 for all heavy atoms). During the three-stage simulated annealing described in the paper,
restraints are included for most previously established hydrogen bonds,
but have only minute effects (< 0.3 A) on the final structure.
X-PLOR
NMR Ensemble Information
Conformer Selection Criteria
structure with lowest dipolar energy
Conformers Calculated Total Number
3
Conformers Submitted Total Number
3
Representative Model
2 (lowest dipolar energy)
Additional NMR Experimental Information
Details
A total of five sets of dipolar couplings are measured, including the one-bond NH, CAHA, C'CA, and NC' couplings, and the two-bond C'HA couplings.
Additionally, the sidechain CBHB dipolar couplings are measured to assign chi-1 rotamers for locked sidechains.