Purification and sequencing of cerein 7B, a novel bacteriocin produced by Bacillus cereus Bc7.
Cerein 7B is a new bacteriocin produced simultaneously with cerein 7A by Bacillus cereus Bc7 in liquid brain heart infusion cultures. Both bacteriocins are not synergistic. The two peptides have been purified to homogeneity by hydrophobic interaction, cation exchange and reverse-phase liquid chromatography. They can be distinguished by their N-terminal amino acid sequences N-Gly-Trp-Gly-Asp-Val-Leu (7A) and N-Gly-Trp-Trp-Asn-Ser-Trp-Gly-Lys (7B). Pre-cerein 7B is 74 amino acids long and contains an 18 aminoacid double-glycine type leader sequence that is removed to produce the mature bacteriocin. The leader peptide sequence is related to that of sec-independent secretion signals suggesting that cerein 7B belongs to class II sec-independent bacteriocins.
Oscáriz
Juan Carlos
JC
Department of Agrarian Production, Public University of Navarre, E-31006 Pamplona, Spain.
Cintas
Luis
L
Holo
Helge
H
Lasa
Iñigo
I
Nes
Ingolf F
IF
Pisabarro
Antonio G
AG
D000595:Amino Acid Sequence; D000900:Anti-Bacterial Agents / Q000145:classification / Q000302:isolation & purification / Q000378:metabolism; D001409:Bacillus cereus / Q000235:genetics / Q000378:metabolism*; D001430:Bacteriocins / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D001483:Base Sequence; D008969:Molecular Sequence Data; D017422:Sequence Analysis, DNA
D000900:Anti-Bacterial Agents; D001430:Bacteriocins