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Reinicke J, Kitatani R, Masoud SS, Galbraith KK, Yoshida W, Igarashi A, Nagasawa K, Berger G, Yanagihara A, Nagai H, Horgen FD. Isolation, Structure Determination, and Synthesis of Cyclic Tetraglutamic Acids from Box Jellyfish Species Alatina alata and Chironex yamaguchii. Molecules 2020; 25:molecules25040883. [PMID: 32079282 PMCID: PMC7070617 DOI: 10.3390/molecules25040883] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 02/08/2020] [Accepted: 02/10/2020] [Indexed: 11/16/2022] Open
Abstract
Cubozoan nematocyst venoms contain known cytolytic and hemolytic proteins, but small molecule components have not been previously reported from cubozoan venom. We screened nematocyst extracts of Alatina alata and Chironex yamaguchii by LC-MS for the presence of small molecule metabolites. Three isomeric compounds, cnidarins 4A (1), 4B (2), and 4C (3), were isolated from venom extracts and characterized by NMR and MS, which revealed their planar structure as cyclic γ-linked tetraglutamic acids. The full configurational assignments were established by syntheses of all six possible stereoisomers, comparison of spectral data and optical rotations, and stereochemical analysis of derivatized degradation products. Compounds 1-3 were subsequently detected by LC-MS in tissues of eight other cnidarian species. The most abundant of these compounds, cnidarin 4A (1), showed no mammalian cell toxicity or hemolytic activity, which may suggest a role for these cyclic tetraglutamates in nematocyst discharge.
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Affiliation(s)
- Justin Reinicke
- Department of Natural Sciences, Hawaii Pacific University, Kaneohe, HI 96744, USA; (J.R.); (K.K.G.)
- Daniel K. Inouye College of Pharmacy, University of Hawaii at Hilo, Hilo, HI 96720, USA
| | - Ryuju Kitatani
- Department of Marine Sciences, Tokyo University of Marine Science and Technology, Tokyo 108-8477, Japan; (R.K.); (A.I.)
| | - Shadi Sedghi Masoud
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, Tokyo 184-8588, Japan; (S.S.M.); (K.N.)
| | - Kelly Kawabata Galbraith
- Department of Natural Sciences, Hawaii Pacific University, Kaneohe, HI 96744, USA; (J.R.); (K.K.G.)
- German Center for Neurodegenerative Diseases (DZNE), Sigmund-Freud-Str. 27, 53127 Bonn, Germany
| | - Wesley Yoshida
- Department of Chemistry, University of Hawaii at Manoa, Honolulu, HI 98622, USA;
| | - Ayako Igarashi
- Department of Marine Sciences, Tokyo University of Marine Science and Technology, Tokyo 108-8477, Japan; (R.K.); (A.I.)
| | - Kazuo Nagasawa
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, Tokyo 184-8588, Japan; (S.S.M.); (K.N.)
| | - Gideon Berger
- Department of Natural Sciences, Hawaii Pacific University, Kaneohe, HI 96744, USA; (J.R.); (K.K.G.)
- Correspondence: (G.B.); (A.Y.); (H.N.); (F.D.H.); Tel.: +1-808-236-3551 (G.B.); +1-808- 956-8328 (A.Y.); +81-3-5463-0454 (H.N.); +1-808-236-5864 (F.D.H.)
| | - Angel Yanagihara
- Békésy Laboratory of Neurobiology, Pacific Biosciences Research Center, School of Ocean and Earth Science and Technology, and Department of Tropical Medicine, John A. Burns School of Medicine, University of Hawaii at Manoa, Honolulu, HI 96822, USA
- Correspondence: (G.B.); (A.Y.); (H.N.); (F.D.H.); Tel.: +1-808-236-3551 (G.B.); +1-808- 956-8328 (A.Y.); +81-3-5463-0454 (H.N.); +1-808-236-5864 (F.D.H.)
| | - Hiroshi Nagai
- Department of Marine Sciences, Tokyo University of Marine Science and Technology, Tokyo 108-8477, Japan; (R.K.); (A.I.)
- Correspondence: (G.B.); (A.Y.); (H.N.); (F.D.H.); Tel.: +1-808-236-3551 (G.B.); +1-808- 956-8328 (A.Y.); +81-3-5463-0454 (H.N.); +1-808-236-5864 (F.D.H.)
| | - F. David Horgen
- Department of Natural Sciences, Hawaii Pacific University, Kaneohe, HI 96744, USA; (J.R.); (K.K.G.)
- Correspondence: (G.B.); (A.Y.); (H.N.); (F.D.H.); Tel.: +1-808-236-3551 (G.B.); +1-808- 956-8328 (A.Y.); +81-3-5463-0454 (H.N.); +1-808-236-5864 (F.D.H.)
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