Correlation of polyunsaturated fatty acids with the cold adaptation of Rhodotorula glutinis.
This study aimed to investigate the correlation between the cold adaptation of Rhodotorula glutinis YM25079 and the membrane fluidity, content of polyunsaturated fatty acids and mRNA expression level of the Δ(12)-desaturase gene. The optimum temperature for YM25079 growth was analysed first, then the composition changes of membrane lipid in YM25079 were detected by GC-MS and membrane fluidity was evaluated by 1-anilinonaphthalene-8-sulphonate (ANS) fluorescence. Meanwhile, the encoding sequence of Δ(12)-fatty acid desaturase in YM25079 was cloned and further transformed into Saccharomyces cerevisiae INVScl for functional analysis. The mRNA expression levels of Δ(12)-fatty acid desaturase at 15°C and 25°C were analysed by real-time PCR. YM25079 could grow at 5-30°C, with the optimum temperature of 15°C. The membrane fluidity of YM25079 was not significantly reduced when the culture temperature decreased from 25°C to 15°C, but the content of polyunsaturated fatty acids (PUFAs), including linoleic acid and α-Linolenic acid increased significantly from 29.4% to 55.39%. Furthermore, a novel Δ(12)-fatty acid desaturase gene YM25079RGD12 from YM25079 was successfully identified and characterized, and the mRNA transcription level of the Δ(12)-desaturase gene was about five-fold higher in YM25079 cells grown at 15°C than that at 25°C. These results suggests that the cold adaptation of Rhodotorula glutinis YM25079 might result from higher expression of genes, especially the Δ(12)-fatty acid desaturase gene, during polyunsaturated fatty acids biosynthesis, which increased the content of PUFAs in the cell membrane and maintained the membrane fluidity at low temperature.
Faculty of Life Science and Technology, Kunming University of Science and Technology, People's Republic of China.|Genetic Diagnosis Centre, Yunnan Provincial Key Laboratory for Birth Defects and Genetic Diseases, First People's Hospital of Yunnan Province, Kunming, People's Republic of China.
Jing
J
He
Faculty of Life Science and Technology, Kunming University of Science and Technology, People's Republic of China.
Zhaojie
Z
Yang
Faculty of Life Science and Technology, Kunming University of Science and Technology, People's Republic of China.
Binbin
B
Hu
Faculty of Life Science and Technology, Kunming University of Science and Technology, People's Republic of China.
Xiuling
X
Ji
Faculty of Life Science and Technology, Kunming University of Science and Technology, People's Republic of China.
Yunlin
Y
Wei
Faculty of Life Science and Technology, Kunming University of Science and Technology, People's Republic of China.
Lianbing
L
Lin
Faculty of Life Science and Technology, Kunming University of Science and Technology, People's Republic of China.
Qi
Q
Zhang
D000222:Adaptation, Physiological / Q000502:physiology*; D000595:Amino Acid Sequence; D002462:Cell Membrane / Q000502:physiology; D003001:Cloning, Molecular; D003080:Cold Temperature; D044943:Fatty Acid Desaturases / Q000235:genetics / Q000378:metabolism; D005231:Fatty Acids, Unsaturated / Q000235:genetics / Q000378:metabolism*; D015870:Gene Expression; D019787:Linoleic Acid / Q000378:metabolism; D008560:Membrane Fluidity / Q000502:physiology; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012248:Rhodotorula / Q000235:genetics / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D012441:Saccharomyces cerevisiae / Q000235:genetics; D017962:alpha-Linolenic Acid / Q000378:metabolism
D005231:Fatty Acids, Unsaturated; D012333:RNA, Messenger; D017962:alpha-Linolenic Acid; D019787:Linoleic Acid; D044943:Fatty Acid Desaturases; C040448:delta-12 fatty acid desaturase
Rhodotorula glutinis; cold adaptation; membrane fluidity; polyunsaturated fatty acids; Δ12-fatty acid desaturase gene