microorganisms Article Bioactivity of Serratiochelin A, a Siderophore Isolated from a Co-Culture of Serratia sp. and Shewanella sp. 1, , 1, , 2 1 Yannik Schneider * y , Marte Jenssen * y , Johan Isaksson , Kine Østnes Hansen , Jeanette Hammer Andersen 1 and Espen H. Hansen 1 1 Marbio, Faculty for Fisheries, Biosciences and Economy, UiT—The Arctic University of Norway, Breivika, N-9037 Tromsø, Norway;
[email protected] (K.Ø.H.);
[email protected] (J.H.A.);
[email protected] (E.H.H.) 2 Department of Chemistry, Faculty of Natural Sciences, UiT—The Arctic University of Norway, Breivika, N-9037 Tromsø, Norway;
[email protected] * Correspondence:
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[email protected] (M.J.); Tel.: +47-7764-9267 (Y.S.); +47-7764-9275 (M.J.) These authors contributed equally to the work. y Received: 15 June 2020; Accepted: 10 July 2020; Published: 14 July 2020 Abstract: Siderophores are compounds with high affinity for ferric iron. Bacteria produce these compounds to acquire iron in iron-limiting conditions. Iron is one of the most abundant metals on earth, and its presence is necessary for many vital life processes. Bacteria from the genus Serratia contribute to the iron respiration in their environments, and previously several siderophores have been isolated from this genus. As part of our ongoing search for medicinally relevant compounds produced by marine microbes, a co-culture of a Shewanella sp. isolate and a Serratia sp. isolate, grown in iron-limited conditions, was investigated, and the rare siderophore serratiochelin A (1) was isolated with high yields.