Linear Aminolipids with Moderate Antimicrobial Activity from the Antarctic Gram-Negative Bacterium Aequorivita sp.

• Published in: Marine Drugs
• Main Authors: Chianese, Giuseppina, Esposito, Fortunato, Parrot, Delphine, Ingham, Colin, de Pascale, Donatella, Tasdemir, Deniz
• Format: Article in Journal/Newspaper
• Language: English
• Published: MDPI 2018
• Subjects: Antarctic; The Antarctic; Antarc*
• Online Access: https://oceanrep.geomar.de/id/eprint/43438/; https://oceanrep.geomar.de/id/eprint/43438/1/marinedrugs-16-00187-v3.pdf; https://oceanrep.geomar.de/id/eprint/43438/2/marinedrugs-16-00187-s001.pdf; https://doi.org/10.3390/md16060187

The combination of LC-MS/MS based metabolomics approach and anti-MRSA activity-guided fractionation scheme was applied on the Gram-negative bacterium Aequorivita sp. isolated from shallow Antarctic sea sediment using a miniaturized culture chip technique. This methodology afforded the isolation of three new (1–3) and four known (4–7) N-terminal glycine- or serine-bearing iso-fatty acid amides esterified with another iso-fatty acid through their C-3 hydroxy groups. The chemical structures of the new compounds were elucidated using a set of spectroscopic (NMR, [α]D and FT-IR) and spectrometric (HRMS, HRMS/MS) methods. The aminolipids possessing an N-terminal glycine unit (1, 2, 4, 5) showed moderate in vitro antimicrobial activity against MRSA (IC50 values 22–145 µg/mL). This is the first in-depth chemistry and biological activity study performed on the microbial genus Aequorivita.