Conformational features responsible for the binding of cyclic analogues of enkephalin to opioid receptors: II. Models of μ‐ and δ‐receptor‐bound structures for analogues containing Phe4

作者: GREGORY V. NIKIFOROVICH , ALEXANDER A. GOLBRAIKH , MARK D. SHENDEROVICH , JURIS BALODIS

DOI: 10.1111/J.1399-3011.1990.TB00969.X

关键词:

摘要: Models of mu- and delta-receptor-bound backbone conformations enkephalin cyclic analogues containing Phe4 were determined by comparing geometrical similarity among the previously found low-energy structures [D-Cys2,Cys5]-enkephalinamide, [D-Cys2,D-Cys5]-enkephalinamide, [D-Pen2,L-Pen5]-enkephalin [D-Pen2,D-Pen5]-enkephalin. The present mu-receptor-bound conformation resembles a beta-I bend in peptide centred on Gly3-Phe4 region. Two slightly different models for conformation; both them are more extended than include gamma-turn (or gamma-like turn) Gly3 residue. Energetically favourable rotamers Tyr Phe side chains also delta-conformations. delta-conformations share with Leu-enkephalin Tyr-D-Lys-Gly-Phe-analogue.

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