N-methylthioacetylation of RYYRIK-NH2 with enhanced specific binding affinity and high antagonist activity for nociceptin ORL1 receptor

A highly specific pure antagonist for the nociceptin ORL1 receptor. [Display omitted] Antagonists of the neuropeptide nociceptin are expected to be potential analgesic and antineuropathic drugs acting on ORL1 GPCR receptors. The peptide library-based antagonist Ac-RYYRIK-NH2 inhibits the nociceptin...

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Bibliographic Details
Published in:Bioorganic & medicinal chemistry 2014-11, Vol.22 (21), p.5721-5726
Main Authors: Li, Jinglan, Nishimura, Hirokazu, Matsushima, Ayami, Shimohigashi, Yasuyuki
Format: Article
Language:English
Subjects:
Acyl group
Amino Acid Sequence
Animals
Antagonist
Cercopithecus aethiops
COS Cells
Humans
Kinetics
Male
Mice
Mice, Inbred ICR
Narcotic Antagonists - chemistry
Narcotic Antagonists - metabolism
Nociceptin
Oligopeptides - chemical synthesis
Oligopeptides - chemistry
Oligopeptides - metabolism
ORL1 receptor
Protein Binding
Receptors, Opioid - chemistry
Receptors, Opioid - genetics
Receptors, Opioid - metabolism
S-Methyl
Transfection
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Summary:A highly specific pure antagonist for the nociceptin ORL1 receptor. [Display omitted] Antagonists of the neuropeptide nociceptin are expected to be potential analgesic and antineuropathic drugs acting on ORL1 GPCR receptors. The peptide library-based antagonist Ac-RYYRIK-NH2 inhibits the nociceptin activity mediated through ORL1, but preserves a considerably high level of agonist activity. We previously reported that the N-terminal acyl group is important for interaction with specific receptors, and developed isovarelyl-RYYRIK-NH2, which exhibits strong antagonist activity with negligible agonist activity. In the present study, in order to obtain a more potent antagonist, we further modified the isovarelyl group by replacing its Cβ atom with an oxygen, nitrogen, or sulfur atom to give the methyl group improved interaction ability. The methyl group bound to such heteroatoms was expected to enhance the hydrophobic interaction between the peptide and the ORL1 receptor. The RYYRIK-NH2 peptide with a methylthioacetyl group, CH3SCH2CO, revealed a higher receptor-binding affinity with strong antagonist activity, and the results suggested the presence of a receptor aromatic group as a complementary residue of this CH3S group.
ISSN:0968-0896
1464-3391
DOI:10.1016/j.bmc.2014.09.049