Fragments of -thymosin from the sea urchinParacentrotus lividus as potential antimicrobial peptidesagainst staphylococcal biofilms

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The immune mediators in echinoderms can be a potential source of novel antimicrobial peptides (AMPs) appliedtoward controlling pathogenic staphylococcal biofilms that are intrinsically resistant to conventional antibiotics.The peptide fraction <5 kDa from the cytosol of coelomocytes of the sea urchin Paracentrotus lividus (5-CC)was tested against a group of Gram-positive and Gram-negative pathogen reference strains. The 5-CC of P. lividuswas active against all planktonic-tested strains but also showed antibiofilm properties against staphylococcal strains.Additionally,wedemonstrated the presenceof three smallpeptides in the5-CCbelonging tosegment 9-41of aP. lividus -thymosin. The smallest of these peptides in particular, showed the common chemical–physical characteristics ofAMPs. This novel AMP from -thymosin has high potential activity as an antibiofilm agent, acting on slow-growingbacterial cells that exhibit a reduced susceptibility to conventional antibiotics and represent a reservoir for recurrentbiofilm-associated infections.
Lingua originaleEnglish
pagine (da-a)79-85
Numero di pagine7
RivistaAnnals of the New York Academy of Sciences
Stato di pubblicazionePublished - 2012


All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • History and Philosophy of Science

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