Calculating three-dimensional molecular structure of paliurine B from atom-atom distance and restrained energy minimization.

@article{Yu1993CalculatingTM,
  title={Calculating three-dimensional molecular structure of paliurine B from atom-atom distance and restrained energy minimization.},
  author={C. Yu and Y. Tseng and S. S. Lee},
  journal={Biochimica et biophysica acta},
  year={1993},
  volume={1156 3},
  pages={
          334-42
        }
}
The conformation of paliurine B, a 13-membered cyclopeptide alkaloid isolated from Paliurus ramosissimus, has been determined from 2D NMR and distance geometry, followed by the restrained energy minimization calculation. The conformation of the 13-membered ring is well-defined but that of the acyclic dipeptide tail region is relatively disordered. In addition, the cavity in the 13-membered ring is just large enough to insert a magnesium ion but is a little small for calcium or sodium ions. 

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