Osmotic response in Lactobacillus casei ATCC 393: Biochemical and biophysical characteristics of membrane

M. Cecilia Machado, Claudia Lopez, Horacio Heras, Emilio A. Rivas

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

The biochemical and biophysical properties of the membrane and some general characteristics of the response of Lactobacillus casei ATCC 393 (reclassified Lactobacillus zeae) to hyperosmotic conditions were studied. Under hypertonic conditions, the hydrophobicity and the bile salt sensitivity of the cultures were increased. The glycolipid AcylH3DG is only present in membranes of NaCl containing medium, whereas, H4DG undergoes a significant increment and H2DG a significant decrease. The fluidity of both the purified membranes and the total lipid vesicles, as determined with the fluorescent probe DPH, did not change in conditions of high salinity. This was coincident with changes in the fatty acid (FA) composition where an increase in the saturated/unsaturated FA ratio was compensated by a rise in the fluidifying 11,12-methyleneoctadecanoic FA (cyc 19:0). Under osmotic stress conditions, Laurdan and acridine orange in total lipid vesicles showed increased lateral lipid packing and proton permeability, respectively.

Original languageEnglish (US)
Pages (from-to)61-70
Number of pages10
JournalArchives of Biochemistry and Biophysics
Volume422
Issue number1
DOIs
StatePublished - Feb 1 2004

Fingerprint

Lactobacillus casei
Fatty Acids
Membranes
Lipids
Saturated fatty acids
Acridine Orange
Fluidity
Glycolipids
Osmotic Pressure
Salinity
Lactobacillus
Hydrophobicity
Membrane Lipids
Bile Acids and Salts
Unsaturated Fatty Acids
Hydrophobic and Hydrophilic Interactions
Fluorescent Dyes
Protons
Permeability
Chemical analysis

Keywords

  • Bile salts
  • Fluorescent probes
  • Lactobacillus casei
  • Lipids
  • Membranes
  • Osmotic stress
  • Permeability

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

Cite this

Osmotic response in Lactobacillus casei ATCC 393 : Biochemical and biophysical characteristics of membrane. / Machado, M. Cecilia; Lopez, Claudia; Heras, Horacio; Rivas, Emilio A.

In: Archives of Biochemistry and Biophysics, Vol. 422, No. 1, 01.02.2004, p. 61-70.

Research output: Contribution to journalArticle

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