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Genome mining and bioactivity studies suggested the sponge-derived bacterium Aquimarina sp. Aq135 as a producer of new antibiotics. Activity-guided isolation identified antibacterial peptides, named aquimarins, featuring a new scaffold with an unusual C-terminal amino group and chlorine moieties. Responsible for the halogenation is the FeII /α-ketoglutarate-dependent chlorinase AqmA that halogenates up to two isoleucine residues in a carrier protein-dependent fashion. Total syntheses of two natural aquimarins and eight non-natural varian