Dynorphin A (1-10) (TFA), an endogenous opioid neuropeptide, binds in the transmembrane domain of the κ-receptor.

Dynorphin A (1-10) (TFA), an endogenous opioid neuropeptide, interacts with κ-opioid receptor's extracellular loop 2 and inhibits NMDA-activated currents with an IC 50 of 42.0 μM.

Dynorphin A TFA, an endogenous opioid peptide, plays a role in inhibitory neurotransmission within the central nervous system (CNS). It acts as a highly potent kappa opioid receptor (KOR) agonist and also stimulates other opioid receptors, including mu (MOR) and delta (DOR). Furthermore, Dynorphin A TFA has been observed to induce neuronal death, making it a significant subject in neurological disease research [1] [2].

Dynorphin B (1-13) TFA acts as an agonist on opioid κ-receptor .