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Deltorphin I

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Title: Deltorphin I  
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Subject: Deltorphin, List of opioids, Phyllomedusa bicolor, Peptides, Kobret
Collection: Amides, Analgesics, Opioids, Peptides
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Deltorphin I

Deltorphin I
CAS number
Jmol-3D images Image 1
Molecular formula C37H52N8O10
Molar mass 768.856 g/mol
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)

Deltorphin I, also known as [D-Ala2]deltorphin I or deltorphin C, is a naturally-occurring, exogenous opioid heptapeptide and hence, exorphin, with the amino acid sequence Tyr-D-Ala-Phe-Asp-Val-Val-Gly-NH2.[1][2] While not known to be endogenous to humans or other mammals, deltorphin I, along with the other deltorphins and the dermorphins, is produced naturally in the skin of species of Phyllomedusa,[1] a genus of frogs native to South and Central America. Deltorphin possesses very high affinity and selectivity as an agonist for the δ-opioid receptor,[1][2] and on account of its unusually high blood-brain-barrier penetration rate,[3] produces centrally-mediated analgesic effects in animals even when administered peripherally.[4]

See also


  1. ^ a b c Erspamer V, Melchiorri P, Falconieri-Erspamer G, et al. (July 1989). "Deltorphins: a family of naturally occurring peptides with high affinity and selectivity for delta opioid binding sites". Proceedings of the National Academy of Sciences of the United States of America 86 (13): 5188–92.  
  2. ^ a b Balboni G, Marastoni M, Picone D, et al. (June 1990). "New features of the delta opioid receptor: conformational properties of deltorphin I analogues". Biochemical and Biophysical Research Communications 169 (2): 617–22.  
  3. ^ Fiori A, Cardelli P, Negri L, Savi MR, Strom R, Erspamer V (August 1997). "Deltorphin transport across the blood–brain barrier". Proceedings of the National Academy of Sciences of the United States of America 94 (17): 9469–74.  
  4. ^ Thomas SA, Abbruscato TJ, Hau VS, et al. (May 1997). "Structure-activity relationships of a series of [D-Ala2]deltorphin I and II analogues; in vitro blood–brain barrier permeability and stability". The Journal of Pharmacology and Experimental Therapeutics 281 (2): 817–25.  

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