title: Purification and characterization of the bacteriocin produced by Lactobacillus sakei MBSa1 isolated from Brazilian salami.
abstract: OBJECTIVE
  The study aimed at determining the biochemical characteristics of the bacteriocin produced by Lactobacillus sakei MBSa1, isolated from salami, correlating the results with the genetic features of the producer strain.
  
  
  RESULTS
  Identification of strain MBSa1 was performed by 16S rDNA sequencing. The bacteriocin was tested for spectrum of activity, heat and pH stability, mechanism of action, molecular mass and amino acid sequence when purified by cation-exchange and reversed-phase HPLC. Genomic DNA was tested for bacteriocin genes commonly present in Lact. sakei. Bacteriocin MBSa1 was heat-stable, unaffected by pH 2·0 to 6·0 and active against all tested Listeria monocytogenes strains. Maximal production of bacteriocin MBSa1 (1600 AU ml(-1)) in MRS broth occurred after 20 h at 25°C. The molecular mass of produced bacteriocin was 4303·3 Da, and the molecule contained the SIIGGMISGWAASGLAG sequence, also present in sakacin A. The strain contained the sakacin A and curvacin A genes but was negative for other tested sakacin genes (sakacins T-α, T-β, X, P, G and Q).
  
  
  CONCLUSIONS
  In the studied conditions, Lact. sakei MBSa1 produced sakacin A, a class II bacteriocin, with anti-Listeria activity.
  
  
  CONCLUSIONS
  The study covers the purification and characterization of the bacteriocin produced by a lactic acid bacteria isolated from salami (Lact. sakei MBSa1), linking genetic and expression information. Its heat-resistance, pH stability in acid conditions (pH 2·0-6·0) and activity against L. monocytogenes food isolates bring up a potential technological application to improve food safety.
authors: Departamento de Alimentos e Nutrição Experimental, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, São Paulo, Brazil.
authors: M S
authors: MS
authors: Barbosa
authors: S D
authors: SD
authors: Todorov
authors: Y
authors: Y
authors: Belguesmia
authors: Y
authors: Y
authors: Choiset
authors: H
authors: H
authors: Rabesona
authors: I V
authors: IV
authors: Ivanova
authors: J-M
authors: JM
authors: Chobert
authors: T
authors: T
authors: Haertlé
authors: B D G M
authors: BD
authors: Franco
mesh_terms: D000595:Amino Acid Sequence; D000900:Anti-Bacterial Agents / Q000096:biosynthesis / Q000737:chemistry / Q000494:pharmacology*; D001430:Bacteriocins / Q000096:biosynthesis / Q000737:chemistry / Q000494:pharmacology*; D001938:Brazil; D007778:Lactobacillus / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D008089:Listeria monocytogenes / Q000187:drug effects; D008461:Meat Products / Q000382:microbiology*
chemical_list: D000900:Anti-Bacterial Agents; D001430:Bacteriocins; C071456:sakacin A
keywords: Lactobacillus sakei; Listeria monocytogenes; bacteriocin; salami