Thermal stress responses in Antarctic yeast, Glaciozyma antarctica PI12, characterized by real-time quantitative PCR

Sook Yee Boo, Clemente Michael Vui Ling Wong, Kenneth Francis Rodrigues, Nazalan Najimudin, Abdul Munir Abd. Murad, Nor Muhammad Mahadi

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Living organisms have some common and unique strategies to response to thermal stress. However, the amount of data on thermal stress response of certain organism is still lacking, especially psychrophilic yeast from the extreme habitat. Therefore, it is not known whether psychrophilic yeast shares the common responses of other organisms when exposed to thermal stresses. In this work, the cold shock and heat shock responses in Antarctic psychrophilic yeast Glaciozyma antarctica PI12 which had an optimal growth temperature of 12 °C were determined. The expression levels of 14 thermal stress-related genes were measured using real-time quantitative PCR (qPCR) when the yeast cells were exposed to cold shock (0 °C), mild cold shock (5 °C), and heat shock (22 °C) conditions. The expression profiles of the 14 genes at these three temperatures varied indicating that these genes had their specific roles to ensure the survival of the yeast. Under cold shock condition, the afp4 and fad genes were over-expressed possibly as a way for the G. antarctica PI12 to avoid ice crystallization in the cell and to maintain the membrane fluidity. Under the heat shock condition, hsp70 was significantly up-regulated possibly to ensure the proteins fold properly. Among the six oxidative stress-related genes, MnSOD and prx were up-regulated under cold shock and heat shock, respectively, possibly to reduce the negative effects caused by oxidative stress. Interestingly, it was found that the trehalase gene, nth1 that plays a role in degrading excess trehalose, was down-regulated under the heat shock condition possibly as an alternative way to accumulate trehalose in the cells to protecting them from being damaged.

Original languageEnglish
Pages (from-to)381-389
Number of pages9
JournalPolar Biology
Volume36
Issue number3
DOIs
Publication statusPublished - 2013

Fingerprint

Heat-Shock Response
Antarctica
cold stress
Real-Time Polymerase Chain Reaction
Shock
quantitative polymerase chain reaction
Yeasts
yeasts
Hot Temperature
heat stress
thermal stress
genes
trehalose
organisms
Trehalose
oxidative stress
Genes
trehalase
membrane fluidity
Oxidative Stress

Keywords

  • Antarctic yeast
  • Cold shock
  • Glaciozyma antarctica PI12
  • Heat shock
  • Real-time quantitative PCR

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

Cite this

Thermal stress responses in Antarctic yeast, Glaciozyma antarctica PI12, characterized by real-time quantitative PCR. / Boo, Sook Yee; Wong, Clemente Michael Vui Ling; Rodrigues, Kenneth Francis; Najimudin, Nazalan; Abd. Murad, Abdul Munir; Mahadi, Nor Muhammad.

In: Polar Biology, Vol. 36, No. 3, 2013, p. 381-389.

Research output: Contribution to journalArticle

Boo, Sook Yee ; Wong, Clemente Michael Vui Ling ; Rodrigues, Kenneth Francis ; Najimudin, Nazalan ; Abd. Murad, Abdul Munir ; Mahadi, Nor Muhammad. / Thermal stress responses in Antarctic yeast, Glaciozyma antarctica PI12, characterized by real-time quantitative PCR. In: Polar Biology. 2013 ; Vol. 36, No. 3. pp. 381-389.
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