Possible bioactive conformations of α‐melanotropin

Abstract
By comparing the results of energy calculation for α‐MSH and its semirigid analogues , , and , a detailed description of two possible bioactive conformations for the ‘specific’ central site of α‐MSH6–9 is proposed representing variants of chain‐reversal structure. A possible explanation of the rise in melanotropic activity of the latter two semirigid analogues is presented.