Abstract

MARTINEZ-MATAMOROS, Diana et al. SCREENING OF MARINE BACTERIAL STRAINS AS SOURCE OF QUORUM SENSING INHIBITORS (QSI): FIRST CHEMICAL STUDY OF Oceanobacillus profundus (RKHC-62B). Vitae [online]. 2016, vol.23, n.1, pp.30-47. ISSN 0121-4004.  https://doi.org/10.17533/udea.vitae.v23n1a04.

Background:Natural products isolated from marine microorganisms have demonstrated a wide range of biological activities included quorum sensing inhibitors. Objectives: We study fifteen marine Firmicutes bacterial strains isolated from the Caribbean soft coral Antillogorgia elisabethae that were evaluated as a novel and sustainable source of quorum sensing inhibitor compounds. Methods: Cultures were made in four different culture media and further extracted using a non-ionic resin. All these extracts were tested in order to establish its quorum sensing inhibition (QSI) activity using Chromobacterium violaceum ATCC 31532. The active extracts were fractionated by RP-18 cartridge. Each fraction was tested and evaluated for its composition by HPLC-PDA. Results: Methanol fractions of Jeotgalicoccus halophilus and Oceanobacillus profundus were the most active ones, suggesting that non-polar compounds could be the responsible for the QSI activity of the bacterial extracts here tested. Conclusions:The chemical study of the organic extract of Oceanobacillus profundus cultured in LBS, yielded the compounds tyrosol (1) and tyrosol acetate (2) as responsible of QSI activity showed by the organic extract.

Keywords : Marine natural products; Marine microorganisms; Jeotgalicoccus halophilus; Oceanobacillus profundus; Quorum sensing inhibitor compounds.

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