Document Detail

Osmotic adaptation in halotolerant yeast, Debaryomyces nepalensis NCYC 3413: role of osmolytes and cation transport.
MedLine Citation:
PMID:  19593594     Owner:  NLM     Status:  MEDLINE    
Debaryomyces nepalensis NCYC 3413, a food spoiling yeast isolated from rotten apple, has been previously demonstrated as halotolerant yeast. In the present study, we assessed its growth, change in cell size, and measured the intracellular polyol and cations (Na(+) or K(+)) accumulated during growth in the absence and presence of different concentrations of salts (NaCl and KCl). Cells could tolerate 2 M NaCl and KCl in defined medium. Scanning electron microscopic results showed linear decrease in mean cell diameter with increase in medium salinity. Cells accumulated high amounts of K(+) during growth at high concentrations of KCl. However, it accumulated low amounts of Na(+) and high amounts of K(+) when grown in the presence of NaCl. Cells grown in the absence of salt showed rapid influx of Na(+)/K(+) on incubation with high salt. On incubation with 2 M KCl, cells grown at 2 M NaCl showed an immediate efflux of Na(+) and rapid uptake of K(+) and vice versa. To withstand the salt stress, osmotic adjustment of intracellular cation was accompanied by intracellular accumulation of polyol (glycerol, arabitol, and sorbitol). Based on our result, we hypothesize that there exists a balanced efflux and synthesis of osmolytes when D. nepalensis was exposed to hypoosmotic and hyperosmotic stress conditions, respectively. Our findings suggest that D. nepalensis is an Na(+) excluder yeast and it has an efficient transport system for sodium extrusion.
Sawan Kumar; Sathyanarayana N Gummadi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-07-11
Journal Detail:
Title:  Extremophiles : life under extreme conditions     Volume:  13     ISSN:  1433-4909     ISO Abbreviation:  Extremophiles     Publication Date:  2009 Sep 
Date Detail:
Created Date:  2009-09-03     Completed Date:  2009-11-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9706854     Medline TA:  Extremophiles     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  793-805     Citation Subset:  IM; S    
Applied and Industrial Microbiology Laboratory, Department of Biotechnology, Indian Institute of Technology-Madras, Chennai, 600036, India.
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MeSH Terms
Adaptation, Physiological
Debaromyces / growth & development,  metabolism*,  ultrastructure
Food Microbiology
Ion Transport
Malus / microbiology
Microscopy, Electron, Scanning
Osmotic Pressure
Potassium / metabolism
Sodium / metabolism
Sugar Alcohols / metabolism
Reg. No./Substance:
0/Sugar Alcohols; 7440-09-7/Potassium; 7440-23-5/Sodium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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