Deltorphin

Deltorphin, also known as deltorphin A and dermenkephalin, is a naturally occurring, exogenous opioid heptapeptide and thus, exorphin, with the amino acid sequence Tyr-D-Met-Phe-His-Leu-Met-Asp-NH₂.^[1][2][3] Along with the other deltorphins (such as deltorphin I and deltorphin II) and the dermorphins, deltorphin is endogenous to frogs of the genus Phyllomedusa such as P. bicolor and P. sauvagei where it is produced in their skin, and is not known to occur naturally in any other species.^[1][2][4] Deltorphin is one of the highest affinity and most selective naturally occurring opioid peptides known, acting as a very potent and highly specific agonist of the δ-opioid receptor.^[1][2][3]

Deltorphin

Names
IUPAC names (3S)-3-[(2S)-2-[(2S)-2-[(2S)-2-[(2S)-2-[(2R)-2-[(2S)-2-amino-3-(4-hydroxyphenyl)propanamido]-4-(methylsulfanyl)butanamido]-3-phenylpropanamido]-3-(1H-imidazol-4-yl)propanamido]-4-methylpentanamido]-4-(methylsulfanyl)butanamido]-3-carbamoylpropanoic acid or L-tyrosyl-D-methionyl-L-phenylalanyl-L-histidyl-L-leucyl-L-methionyl-L-α-asparagine
Other names Deltorphin A; Dermenkephalin
Identifiers
CAS Number	119975-64-3
3D model (JSmol)	Interactive image
ChemSpider	2299380
PubChem CID	3035060
CompTox Dashboard (EPA)	DTXSID60152630
InChI InChI=1S/C44H62N10O10S2/c1-25(2)18-34(42(62)50-32(15-17-66-4)40(60)51-33(38(46)58)22-37(56)57)52-44(64)36(21-28-23-47-24-48-28)54-43(63)35(20-26-8-6-5-7-9-26)53-41(61)31(14-16-65-3)49-39(59)30(45)19-27-10-12-29(55)13-11-27/h5-13,23-25,30-36,55H,14-22,45H2,1-4H3,(H2,46,58)(H,47,48)(H,49,59)(H,50,62)(H,51,60)(H,52,64)(H,53,61)(H,54,63)(H,56,57)/t30-,31+,32-,33-,34-,35-,36-/m0/s1 Key: BHSURCCZOBVHJJ-NWOHMYAQSA-N InChI=1/C44H62N10O10S2/c1-25(2)18-34(42(62)50-32(15-17-66-4)40(60)51-33(38(46)58)22-37(56)57)52-44(64)36(21-28-23-47-24-48-28)54-43(63)35(20-26-8-6-5-7-9-26)53-41(61)31(14-16-65-3)49-39(59)30(45)19-27-10-12-29(55)13-11-27/h5-13,23-25,30-36,55H,14-22,45H2,1-4H3,(H2,46,58)(H,47,48)(H,49,59)(H,50,62)(H,51,60)(H,52,64)(H,53,61)(H,54,63)(H,56,57)/t30-,31+,32-,33-,34-,35-,36-/m0/s1 Key: BHSURCCZOBVHJJ-NWOHMYAQBV
SMILES O=C(O)C[C@@H](C(=O)N)NC(=O)[C@@H](NC(=O)[C@@H](NC(=O)[C@@H](NC(=O)[C@@H](NC(=O)[C@H](NC(=O)[C@@H](N)Cc1ccc(O)cc1)CCSC)Cc2ccccc2)Cc3c[nH]cn3)CC(C)C)CCSC
Properties
Chemical formula	C44H62N10O10S2
Molar mass	955.154 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Deltorphins have an unusually high blood–brain barrier penetration rate. The nonselective opiate antagonist naloxone inhibits deltorphin uptake by brain microvessels, but neither the selective δ-opioid antagonist naltrindole nor a number of opioid peptides with different affinities for δ- or μ-opioid receptors compete with deltorphins for the transport.^[5]

See also

• Deltorphin I
• Dermorphin

References

1. Kreil G, Barra D, Simmaco M, et al. (March 1989). "Deltorphin, a novel amphibian skin peptide with high selectivity and affinity for delta opioid receptors". European Journal of Pharmacology. 162 (1): 123–8. doi:10.1016/0014-2999(89)90611-0. PMID 2542051.
2. Mor A, Delfour A, Sagan S, et al. (September 1989). "Isolation of dermenkephalin from amphibian skin, a high-affinity delta-selective opioid heptapeptide containing a D-amino acid residue". FEBS Letters. 255 (2): 269–74. doi:10.1016/0014-5793(89)81104-4. PMID 2551734. S2CID 6095995.
3. 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. Bibcode:1989PNAS...86.5188E. doi:10.1073/pnas.86.13.5188. PMC 297583. PMID 2544892.
4. Temussi PA, Picone D, Tancredi T, et al. (April 1989). "Conformational properties of deltorphin: new features of the delta-opioid receptor". FEBS Letters. 247 (2): 283–8. doi:10.1016/0014-5793(89)81353-5. PMID 2541018. S2CID 84259225.
5. Fiori, Anna; Cardelli, Patrizia; Negri, Lucia; Savi, Maria Rosaria; Strom, Roberto; Erspamer, Vittorio (1997-08-19). "Deltorphin transport across the blood–brain barrier". Proceedings of the National Academy of Sciences of the United States of America. 94 (17): 9469–9474. Bibcode:1997PNAS...94.9469F. doi:10.1073/pnas.94.17.9469. ISSN 0027-8424. PMC 23226. PMID 9256506.