Abstract:
:Mediated electrochemical detection of catabolism in prokaryotic cells is well documented; however, the application of this technique to eukaryotic cells has received less attention. Two catabolic substrate-dependent mediated electrochemical signals were detected in the yeast Saccharomyces cerevisiae. The signal using a single hydrophilic mediator (ferricyanide) is small whereas the response using a double mediator system comprising a hydrophilic and a lipophilic mediator (ferricyanide and menadione) is up to three orders of magnitude larger. The behaviour of each response during cell ageing is different: the single mediator response increases whereas the double mediator response decreases. This difference indicates that the two signals originate at different points in the catabolic pathways. In S. cerevisiae the double mediator response is proposed to originate from the reduction of the lipophilic mediator by NADPH produced in the pentose phosphate pathway. The single mediator signal arises from reduction of the hydrophilic mediator by an extracellular redox species produced in response to the presence of glucose.
journal_name
Appl Microbiol Biotechnoljournal_title
Applied microbiology and biotechnologyauthors
Baronian KH,Downard AJ,Lowen RK,Pasco Ndoi
10.1007/s00253-002-1108-3subject
Has Abstractpub_date
2002-10-01 00:00:00pages
108-13issue
1-2eissn
0175-7598issn
1432-0614journal_volume
60pub_type
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