Pediococcus sp. ISK-1 Produces a Novel Lantibiotic, Bacteriocin ISK-1

Hirokazu Kimura, Hiromi Matsusaki, Toshihiro Sashihara, Kenji Sonomoto, Ayaaki Ishizaki

Research output: Contribution to journalArticlepeer-review


Bacteriocin ISK-1 is a proteinaceous inhibitory substance produced by Pediococcus sp. ISK-1 isolated from well-aged Nukadoko (Kimura et al., 1997a). Bacteriocin ISK-1 was purified by acid treatment, ammonium sulfate precipitation, cation-exchange chromatography and reversed-phase high performance chromatography from the culture supernatant of Pediococcus sp. ISK-1. Purification of bacteriocin ISK-1 resulted in 30-fold increase in the specific activity and the recovery was 17%. Molecular mass of bacteriocin ISK-1 determined by fast atom bombardment-mass spectrometry was 2,960. The amino acid composition analysis of bacteriocin ISK-1 revealed that it contained lanthionine and/or 3-methyllanthionine which is a characteristic of lantibiotics. The N-terminal amino acid sequence analysis indicated the first seven N-terminal amino acid residues as, NH2-K-K-K-S-G-V-I. The primary sequence showed significant homology to the lantibiotics lacticin 481 from Lactococcus lactis and variacin from Micrococcus varians, which suggests that bacteriocin ISK-1 is a novel lantibiotic belonging to a lacticin-481 type.

Original languageEnglish
Pages (from-to)195-207
Number of pages13
JournalJournal of the Faculty of Agriculture, Kyushu University
Issue number1-2
Publication statusPublished - Nov 1998

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Agronomy and Crop Science


Dive into the research topics of 'Pediococcus sp. ISK-1 Produces a Novel Lantibiotic, Bacteriocin ISK-1'. Together they form a unique fingerprint.

Cite this