期刊
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
卷 9, 期 -, 页码 2916-2924出版社
BEILSTEIN-INSTITUT
DOI: 10.3762/bjoc.9.328
关键词
allotopic; bivalent ligand; designed multiple ligand; JDTic; kappa-opioid receptor; natural products; Salvinorin A
资金
- National Institute of Drug Abuse [P30 DA13429]
The recent crystal structure of the kappa-opioid receptor (kappa-OR) revealed, unexpectedly, that the antagonist JDTic is a bivalent ligand: in addition to the orthosteric pocket occupied by morphinans, JDTic also occupies a distinct (allotopic) pocket. Mutagenesis data suggest that salvinorin A (1) also binds to this allotopic pocket, adjacent to the aspartate residue that anchors the basic nitrogen atom of classical opiates (Asp138). It has been suggested that an H-bond donor appended to 1 might interact with Asp138, increasing affinity. Such a bivalent ligand might also possess altered functional selectivity. Based on modeling and known N-furanylmethyl opioid antagonists, we appended H-bond donors to the furan ring of 1. (Dimethylamino) methyl groups at C-15 or C-16 abolished affinity for kappa-OR. Hydroxymethylation at C-16 was tolerated, but 15,16-bis-hydroxymethylation was not. Since allosteric modulators may go undetected in binding assays, we also tested these and other low-affinity derivatives of 1 for allosteric modulation of dynorphin A in the [S-35] GTP gamma S assay. No modulation was detected. As an alternative attachment point for bivalent derivatives, we prepared the 2-(hydroxyethoxy) methyl ether, which retained high affinity for kappa-OR. We discuss alternative design strategies for linked, fused or merged bivalent derivatives of 1.
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