Theoretical conformational analysis of brain peptides

Abstract
Using a semi-empirical method, an a priori conformational analysis of the octadecapeptide .beta.-melanocyte-stimulating hormone (.beta.-MSH) was carried out. The spatial structure of .beta.-MSH can be described by eight low-energy conformations, yielded by combinations of the most stable states of the respective free fragments. Calculations produced the values of all dihedral angles of the backbones and side chains of these forms as well as intra- and inter-residue interaction energies.