Big dynorphin
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| IUPAC name
L-tyrosyl-glycyl-glycyl-L-phenylalanyl-L-leucyl-L-arginyl-L-arginyl-L-isoleucyl-L-arginyl-L-prolyl-L-lysyl-L-leucyl-L-lysyl-L-tryptophyl-L-alpha-aspartyl-L-asparagyl-L-glutaminyl-L-lysyl-L-arginyl-L-tyrosyl-glycyl-glycyl-L-phenylalanyl-L-leucyl-L-arginyl-L-arginyl-L-glutaminyl-L-phenylalanyl-L-lysyl-L-valyl-L-valyl-L-threonine
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Other names
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| Identifiers | |
3D model (JSmol)
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PubChem CID
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| Properties | |
| C185H292N58O41 | |
| Molar mass | 3985 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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Big dynorphin is an endogenous opioid peptide of the dynorphin family. It forms when a precursor protein prodynorphin is not fully processed, resulting in a 32-amino acid molecule containing both dynorphin A and dynorphin B sequences. It has the amino acid sequence: Tyr-Gly-Gly-Phe-Leu-Arg-Arg-Ile-Arg-Pro-Lys-Leu-Lys-Trp-Asp-Asn-Gln-Lys-Arg-Tyr-Gly-Gly-Phe-Leu-Arg-Arg-Gln-Phe-Lys-Val-Val-Thr.
Big dynorphin is a highly efficiacious principal endogenous agonist at the human κ-opioid receptor (KOR). It produces one of the strongest responses at GPR139 receptor among dynorphins. Additionally, it uniquely modulates NMDA receptor and potentiates acid-sensing ion channel 1a (ASIC1a).
It plays a role in pain and stress responses. It exhibits both anelgesic and pro-nociceptive properties. In mice it modulates memory and learning, and has anxiolytic properties, contributing to homeostatic regulation of opioid signaling in the central nervous system.