Measurement of the glycogen synthetic pathway in permeabilized cells of cyanobacteria

Diego F. Gómez Casati, Miguel A. Aon, Sonia Cortassa, Alberto A. Iglesias

Research output: Contribution to journalArticle

Abstract

A simple, rapid and reliable procedure for permeabilizing cyanobacterial cells and measuring the glycogen synthetic pathway in situ, is presented. Cells from Anabaena sp. strain PCC 7120 were permeabilized with a mixture of toluene:ethanol (1:4 v/v). Fluorescence microscopy of cells incubated with fluorescein diacetate showed Anabaena non-permeabilized cells as green fluorescents, whereas permeabilized (viable) cells exhibited the intrinsic red fluorescence. Labelled α-1,4-glucan was recovered when permeabilized cells were incubated with the substrates of ADP-glucose pyrophosphorylase or glycogen synthase. The kinetic and regulatory properties of both enzymes could be reproduced in situ. The simplicity of the procedure and the ability to measure in situ glucan fluxes show the methodology as useful for studying the intracellular regulation of storage polysaccharides in a photosynthetic prokaryote.

Original languageEnglish (US)
Pages (from-to)7-11
Number of pages5
JournalFEMS microbiology letters
Volume194
Issue number1
DOIs
StatePublished - Jan 1 2001

Keywords

  • ADP-glucose pyrophosphorylase
  • Anabaena PCC 7120
  • Cyanobacteria
  • Glycogen
  • Glycogen synthase
  • Metabolic flux measurement
  • Permeabilized cell
  • Starch synthesis

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology
  • Genetics

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