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Studies of the thyrotropin‐releasing factor. II. Conformations of TRF and some analogs

The conformation of the thyrotropin‐releasing factor (TRF) and four analogs have been studied by the CNDO/2 molecular orbital method. The Nδ‐protonated tautomer of TRF is predicted to be the more stable of the two tautomeric forms; however, it is postulated that the Nε‐tautomer possesses the most active minimum‐energy conformation. The peptide backbone for the five compounds remains nearly constant. The conformations predicted from model fragments are very near to those found for the full compound.