DNA sequencing and homologous expression of a small peptide conferring immunity to gassericin a, a circular bacteriocin a produced by lactobacillus gasseri LA39

Yasushi Kawai, Joni Kusnadi, Rober Kemperman, Jan Kok, Yoshiyuki Ito, Mikiko Endo, Kensuke Arakawa, Hideaki Uchida, Junko Nishimura, Haruki Kitazawa, Tadao Saito

研究成果: Article査読

24 被引用数 (Scopus)

抄録

Gassericin A, produced by Lactobacillus gasseri LA39, is a hydrophobic circular bacteriocin. The DNA region surrounding the gassericin A structural gene, gaaA, was sequenced, and seven open reading frames (ORFs) of 3.5 kbp (gaaBCADITE) were found with possible functions in gassericin A production, secretion, and immunity. The deduced products of the five consecutive ORFs gaaADITE have homology to those of genes involved in butyrivibriocin AR10 production, although the genetic arrangements are different in the two circular bacteriocin genes. Gaal is a small, positively charged hydrophobic peptide of 53 amino acids containing a putative transmembrane segment. Heterologous expression and homologous expression of Gaal in Lactococcus lactis subsp. cremoris MG1363 and L. gasseri JCM1131T, respectively, were studied. Gaal-expressing strains exhibited at least sevenfold-higher resistance to gassericin A than corresponding control strains, indicating that goal encodes an immunity peptide for gassericin A. Comparison of Gaal to peptides with similar characteristics found in the circular bacteriocin gene loci is discussed.

本文言語English
ページ(範囲)1324-1330
ページ数7
ジャーナルApplied and environmental microbiology
75
5
DOI
出版ステータスPublished - 2009 3

ASJC Scopus subject areas

  • バイオテクノロジー
  • 食品科学
  • 応用微生物学とバイオテクノロジー
  • 生態学

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