Abstract
In this paper, we describe the synthesis of novel endomorphin-2 analogs, containing N-methylated amino acids, consecutively in each position. The receptor-binding profile of the new analogs and their stability against enzymatic cleavage by commercially available peptidases, carboxypeptidase Y and aminopeptidase M, and a rat brain homogenate are reported. The best analog of this series, [Sar 2]endomorphin-2, was almost equipotent with the parent peptide in the μ-receptor-binding assay and was also highly resistant to enzymatic degradation. This analog may be a suitable candidate for the in vivo antinociceptive studies.
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