Tritiated deltorphin analogues with high specific radioactivity and high affinity and selectivity for delta opioid receptors
作者:Zsuzsa Darula、Antal Péter、Géza Tóth
DOI:10.1002/(sici)1099-1344(199710)39:10<817::aid-jlcr28>3.0.co;2-b
日期:1997.10
New conformationally constrained deltorphin I and II analogues were designed and synthesized, using a more lipophilic amino acid (Ile) instead of Val at positions 5 and 6, and 2-aminotetralin-2-carboxylic acid (Ate) at position 3. Two analogues (Tyr-D-Ala-(S)-Atc-Asp-Ile-lle-Gly-NH2 and Tyr-D-Ala-(R)-Atc-Glu-Ile-IIe-Gly-NH2) with high potency and selectivity for 6 opioid receptors were chosen for tritiation, with 3,5-I-2-Tyr(1)-deltorphin analogues as precursors. Catalytic dehalotritiation of these precursors resulted in tritiated peptides with high specific radioactivity (1.28 TBq/mmol (34.5 Ci/mmol) and 1.33 TBq/mmol(36.0 Ci/mmol), respectively).