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GDA is produced by three species of the Alexandrium genus of dinoflagellates, blooms of which are associated with \u201cred tides\u201d, which are widely dispersed and can cause significant harm to marine life. The toxicity of GDA has been attributed to stabilization of the filamentous form of the actin group of structural proteins, but the structural basis for its binding is not known. Japanese workers, capitalizing on the assumed rigidity of the heavily substituted macrolide ring, assigned the relative configuration and conformation by relying on NMR coupling constants and NOEs; the absolute configuration was assigned by degradation to a fragment that was compared with synthetic material. We have confirmed the absolute structure and broad features of the conformation by X-ray crystallography but have found GDA to complex with alkali metal ions in spite of two of the heterocyclic rings facing outward. Such an arrangement would have been expected to impair the ability of GDA to form a crown-ether-type multidentate complex. GDA shows preference for K+, Rb+, and Cs+ over Li+ and Na+ in determinations of relative affinities by TLC on metal-ion-impregnated silica gel plates and by electrospray mass spectrometry. NMR studies employing the K+ complex of GDA, formed from potassium tetrakis\u00ad[pentafluorophenyl]\u00adborate (KBArF20), reveal a major alteration of the conformation of the macrolide ring. These observations argue against the prior assumption of rigidity of the ring. Alterations in chemical shifts, coupling constants, and NOEs indicate the involvement of most of the molecule other than ring F. Molecular mechanics simulations suggest K+ forms a heptacoordinate complex involving OA, OB, OC, OD, OE, and the C-26 and C-27 hydroxy groups. We speculate that complexation of K+ with GDA electrostatically stabilizes the complex of GDA with filamentous actin in marine animals due to the protein being negatively charged at physiological pH. GDA may also cause potassium leakage through cell membranes. This study provides insight into the structural features and chemistry of GDA that may be responsible for significant ecological damage associated with the GDA-producing algal blooms.<\/jats:p>","DOI":"10.1021\/acs.jnatprod.9b01094","type":"journal-article","created":{"date-parts":[[2020,2,21]],"date-time":"2020-02-21T14:34:23Z","timestamp":1582295663000},"page":"1069-1081","source":"Crossref","is-referenced-by-count":13,"title":["Algal Toxin Goniodomin A Binds Potassium Ion Selectively\nto Yield a Conformationally Altered Complex with Potential Biological\nConsequences"],"prefix":"10.1021","volume":"83","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5924-4972","authenticated-orcid":true,"given":"Craig J.","family":"Tainter","sequence":"first","affiliation":[{"name":"Vanderbilt University , , , ,","place":["Nashville, Tennessee, United States, 37235"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1539-6031","authenticated-orcid":true,"given":"Nathan D.","family":"Schley","sequence":"additional","affiliation":[{"name":"Vanderbilt University , , , ,","place":["Nashville, Tennessee, United States, 37235"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4982-3900","authenticated-orcid":true,"given":"Constance M.","family":"Harris","sequence":"additional","affiliation":[{"name":"Vanderbilt University , , , ,","place":["Nashville, Tennessee, United States, 37235"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Donald F.","family":"Stec","sequence":"additional","affiliation":[{"name":"Vanderbilt University , , , ,","place":["Nashville, Tennessee, United States, 37235"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna K.","family":"Song","sequence":"additional","affiliation":[{"name":"Virginia Institute of Marine Science, William & Mary , , , ,","place":["Gloucester Point, Virginia, United States, 23062"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5008-5338","authenticated-orcid":true,"given":"Andrzej","family":"Balinski","sequence":"additional","affiliation":[{"name":"Vanderbilt University , , , ,","place":["Nashville, Tennessee, United States, 37235"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4871-5024","authenticated-orcid":true,"given":"Jody C.","family":"May","sequence":"additional","affiliation":[{"name":"Vanderbilt University , , , ,","place":["Nashville, Tennessee, United States, 37235"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8918-6419","authenticated-orcid":true,"given":"John A.","family":"McLean","sequence":"additional","affiliation":[{"name":"Vanderbilt University , , , ,","place":["Nashville, Tennessee, United States, 37235"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1751-1566","authenticated-orcid":true,"given":"Kimberly S.","family":"Reece","sequence":"additional","affiliation":[{"name":"Virginia Institute of Marine Science, William & Mary , , , ,","place":["Gloucester Point, Virginia, United States, 23062"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3062-344X","authenticated-orcid":true,"given":"Thomas M.","family":"Harris","sequence":"additional","affiliation":[{"name":"Vanderbilt University , , , ,","place":["Nashville, Tennessee, United States, 37235"]},{"name":"Virginia Institute of Marine Science, William & Mary , , , ,","place":["Gloucester Point, Virginia, United States, 23062"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2020,2,21]]},"reference":[{"key":"2026081719183795300_cit1","doi-asserted-by":"publisher","first-page":"881","DOI":"10.3390\/md8040881","volume":"8","author":"Silvestre","year":"2010","journal-title":"Mar.\nDrugs"},{"key":"2026081719183795300_cit2","doi-asserted-by":"publisher","first-page":"269","DOI":"10.1016\/0041-0101(89)90141-4","volume":"27","author":"Terao","year":"1989","journal-title":"Toxicon"},{"key":"2026081719183795300_cit3","doi-asserted-by":"crossref","first-page":"26026","DOI":"10.1016\/S0021-9258(19)74488-3","volume":"268","author":"Furukawa","year":"1993","journal-title":"J. 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