Biologically active conformation of tuftsin

Abstract
The main features of the assumed biologically active conformation of the tuftsin molecule have been described using the energy calculations as well as the n.m.r. and CD‐spectroscopy measurements performed for the conformationally rigid active cycloanalogue, Thr‐L‐ys‐Pro‐Arg. The biologically active conformation has been shown to be of BBRB or BLRB backbone type with the trans‐conformation of proline residue.