Membrane fluidity regulation in yeasts

Learmonth, Robert P. and Butcher, Brett A. (2008) Membrane fluidity regulation in yeasts. In: 7th International Weber Symposium on Innovative Fluorescence Methodologies in Biochemistry and Medicine, 6-12 Jun 2008, Kauai, Hawaii.

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Abstract

Membrane fluidity modulation appears to be an important mechanism facilitating yeast environmental adaptation. To elucidate underlying processes that may contribute to fluidity modulation we compared responses in yeasts mutants lacking the lipid desaturase ole1 or membrane-associated hsp30, to response of the parent strain. We assessed membrane fluidity, composition and cell physiological parameters during aerobic and anaerobic batch culture, as well as in response to glucose, a metabolite that stimulates marked change in cell physiology. Fluidity modulation was assessed by determination of Generalized Polarization of the membrane probe laurdan, via steady state fluorescence spectroscopy. During batch growth the parent strain showed characteristic patterns of membrane fluidity, membrane phospholipid and fatty acyl composition, growth rate, glucose or ethanol consumption and viability. However the ole and hsp30 deletants appeared to be out of balance with less efficient metabolism, lower cell division rates and lower viability. The ole defect could be ameliorated by addition of unsaturated fatty acids. The hsp30 defect could not be ameliorated externally and had particular impact over the transition at glucose exhaustion. The hsp30 and ole deletants both showed abnormal changes in fluidity on exposure to glucose. In summary the fluidity regulation responses in the mutants were different to the parent strain, being unbalanced by ablation of the activities of either membrane-associated protein.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Poster)
Refereed: No
Item Status: Live Archive
Additional Information: This is an unrefereed poster paper presented at the conference. No evidence of copyright restrictions.
Depositing User: Assoc Prof Robert Learmonth
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 17 Oct 2010 06:36
Last Modified: 02 Jul 2013 23:33
Uncontrolled Keywords: yeast; membrane; fluidity; yeast environmental adaptation
Fields of Research (FOR2008): 10 Technology > 1003 Industrial Biotechnology > 100303 Fermentation
06 Biological Sciences > 0601 Biochemistry and Cell Biology > 060110 Receptors and Membrane Biology
06 Biological Sciences > 0605 Microbiology > 060503 Microbial Genetics
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
E Expanding Knowledge > 97 Expanding Knowledge > 970110 Expanding Knowledge in Technology
B Economic Development > 86 Manufacturing > 8601 Processed Food Products and Beverages (excl. Dairy Products) > 860199 Processed Food Products and Beverages (excl. Dairy Products) not elsewhere classified
URI: http://eprints.usq.edu.au/id/eprint/6461

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