Linked Life Data

16226432

Source:http://linkedlifedata.com/resource/pubmed/id/16226432

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
2005-10-24
pubmed:abstractText
Nisin, an amphipathic antibiotic peptide, is produced by a number of strains of Lactococcus lactis subsp. lactis. It has been employed as a food preservative as it has a high antibacterial activity with a relatively low toxicity for humans. Nisin is known to exert a high antibacterial activity against Gram-positive but not Gram-negative bacteria. However, purified nisin Z was found to show an antibacterial activity both against Gram-positive and Gram-negative bacteria. To clarify the mechanisms of activity, nisin Z and purified nisin Z were tested for their antibacterial activities in a high-salt environment. The activity of nisin Z against Staphylococcus aureus was stable even in the presence of NaCl at 100 mM, showing ca. 2log colony-forming unit (CFU) reduction. In contrast, the activity of nisin Z against Escherichia coli was highly sensitive to the same concentration of NaCl, and CFU reduction was not observed. Furthermore, purified nisin Z caused the permeabilisation both of S. aureus and E. coli cytoplasmic membranes. The permeabilisation of E. coli but not S. aureus cytoplasmic membranes was remarkably reduced in a high-salt environment. Moreover, vancomycin inhibited the nisin Z-induced permeabilisation of the S. aureus cytoplasmic membrane. These results suggest that nisin Z utilises two distinct mechanisms of antibacterial activity: a high-salt-sensitive mechanism for E. coli and a high-salt-insensitive mechanism for S. aureus.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0924-8579
pubmed:author
pubmed:issnType
Print
pubmed:volume
26
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
396-402
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
Dual antibacterial mechanisms of nisin Z against Gram-positive and Gram-negative bacteria.
pubmed:affiliation
Department of Bacteriology, Kurume University School of Medicine, 67 Asahi-machi, Kurume, Fukuoka 830-0011, Japan. kuwano@med.kurume-u.ac.jp
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't