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Chem Biodivers

Title:		The Molting Biomarker Molecule Exists as 2-Acetamido-2-deoxy-gluconic Acid in Urine of Blue Crabs and Helmet Crabs
Author(s):		Kamio M; Nagakura Y; Yano H;
Address:		"Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato, Tokyo, 108-8477, Japan. Shizuoka Prefectural Research Institute of Fishery, 3690 Kogawa, Yaizu, Shizuoka, 425-0033, Japan"
Journal Title:		Chem Biodivers
Year:		2017
Volume:		20170902
Issue:		9
Page Number:		-
DOI:		10.1002/cbdv.201700063
ISSN/ISBN:		1612-1880 (Electronic) 1612-1872 (Linking)
Abstract:		"N-Acetyl-d-glucosamino-1,5-lactone 1 has been reported as a candidate component of the sex pheromone mixture of female blue crabs, Callinectes sapidus, since it is present in the urine of reproductive females and males detect it. Theoretically, 1 can convert to a 1,4-lactone isomer 2 or to the corresponding carboxylic acid, 2-acetamido-2-deoxygluconic acid 3 by hydrolysis in aqueous solution. In this study, we examined the biologically relevant state of equilibrium mixture of 1, 2, and 3 in crab urine using ESI-MS and NMR analyses. The ESI-MS analysis showed that the dominant form of solubilized synthetic 1 is lactone 1 and/or 2, immediately after solubilization in deuterated water, seawater, and phosphate buffer and gradually changing to carboxylic acid 3 which becomes most predominant in phosphate buffer. The NMR analysis showed that synthetic 1 converts to other forms in deuterated water and seawater, and reaches an equilibrium mixture of at least three forms within 24 h. In contrast, 1 converts to a single state of another form in deuterated water with 35 mm phosphate buffer pH 7.6 within 24 h, which is identical to the state in urine with or without phosphate buffer. Thus, we conclude that the molting biomarker sensed by male crabs is 3"
Keywords:		"Acetamides/*analysis Animals Brachyura/chemistry/*growth & development Female Gluconates/*analysis Lactones/analysis Magnetic Resonance Spectroscopy Male *Molting Sex Attractants/analysis Spectrometry, Mass, Electrospray Ionization Urine/chemistry Calline;"
Notes:		"MedlineKamio, Michiya Nagakura, Yasuhiro Yano, Hirona eng Switzerland 2017/07/08 Chem Biodivers. 2017 Sep; 14(9). doi: 10.1002/cbdv.201700063. Epub 2017 Sep 2"