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A Marine Isolate of Bacillus pumilus Secretes a Pumilacidin Active against Staphylococcus aureus.


ABSTRACT: Producing antimicrobials is a common adaptive behavior shared by many microorganisms, including marine bacteria. We report that SF214, a marine-isolated strain of Bacillus pumilus, produces at least two different molecules with antibacterial activity: a molecule smaller than 3 kDa active against Staphylococcus aureus and a molecule larger than 10 kDa active against Listeria monocytogenes. We focused our attention on the anti-Staphylococcus molecule and found that it was active at a wide range of pH conditions and that its secretion was dependent on the growth phase, medium, and temperature. A mass spectrometry analysis of the size-fractionated supernatant of SF214 identified the small anti-Staphylococcus molecule as a pumilacidin, a nonribosomally synthesized biosurfactant composed of a mixture of cyclic heptapeptides linked to fatty acids of variable length. The analysis of the SF214 genome revealed the presence of a gene cluster similar to the srfA-sfp locus encoding the multimodular, nonribosomal peptide synthases found in other surfactant-producing bacilli. However, the srfA-sfp cluster of SF214 differed from that present in other surfactant-producing strains of B. pumilus by the presence of an insertion element previously found only in strains of B. safensis.

SUBMITTER: Saggese A 

PROVIDER: S-EPMC6025400 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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A Marine Isolate of <i>Bacillus pumilus</i> Secretes a Pumilacidin Active against <i>Staphylococcus aureus</i>.

Saggese Anella A   Culurciello Rosanna R   Casillo Angela A   Corsaro Maria Michela MM   Ricca Ezio E   Baccigalupi Loredana L  

Marine drugs 20180524 6


Producing antimicrobials is a common adaptive behavior shared by many microorganisms, including marine bacteria. We report that SF214, a marine-isolated strain of <i>Bacillus pumilus</i>, produces at least two different molecules with antibacterial activity: a molecule smaller than 3 kDa active against <i>Staphylococcus aureus</i> and a molecule larger than 10 kDa active against <i>Listeria monocytogenes.</i> We focused our attention on the anti-<i>Staphylococcus</i> molecule and found that it w  ...[more]

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