title: Synthesis and olfactory activity of unnatural, sulfated 5β-bile acid derivatives in the sea lamprey (Petromyzon marinus).
abstract: A variety of unnatural bile acid derivatives (9a-9f) was synthesized and used to examine the specificity with which the sea lamprey (Petromyzon marinus) olfactory system detects these compounds. These compounds are analogs of petromyzonol sulfate (PS, 1), a component of the sea lamprey migratory pheromone. Both the stereochemical configuration at C5 (i.e., 5α vs. 5β) and the extent and sites of oxygenation (hydroxylation or ketonization) of the bile acid derived steroid skeleton were evaluated by screening the compounds for olfactory activity using electro-olfactogram recording. 5β-Petromyzonol sulfate (9a) elicited a considerable olfactory response at sub-nanomolar concentration. In addition, less oxygenated systems (i.e., 9b-9e) elicited olfactory responses, albeit with less potency. The sea lamprey sex pheromone mimic 9f (5β-3-ketopetromyzonol sulfate) was also examined and found to produce a much lower olfactory response. Mixture studies conducted with 9a and PS (1) suggest that stimulation is occurring via similar modes of activation, demonstrating a relative lack of specificity for recognition of the allo-configuration (i.e., 5α) in sea lamprey olfaction. This attribute could facilitate design of pheromone analogs to control this invasive species.
authors.affiliation: Department of Chemistry, College of Science and Engineering, University of Minnesota, Minneapolis, MN 55455, United States.
authors.forename: Aaron C
authors.initials: AC
authors.lastname: Burns
authors.forename: Peter W
authors.initials: PW
authors.lastname: Sorensen
authors.forename: Thomas R
authors.initials: TR
authors.lastname: Hoye
mesh_terms: D000818:Animals; D001647:Bile Acids and Salts / Q000138:chemical synthesis*; D002793:Cholic Acids / Q000138:chemical synthesis*; D009831:Olfactory Mucosa / Q000378:metabolism; D048428:Petromyzon / Q000378:metabolism*; D012903:Smell / Q000502:physiology*
chemical_list: C558835:5 beta-3-ketopetromyzonol sulfate; D001647:Bile Acids and Salts; D002793:Cholic Acids; C500317:petromyzonol sulfate