Significance of fatty acid supplementation on profiles of cell growth, fatty acid, and gene expression of three desaturases in Mucor rouxii
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Author list: Khoomrung S., Laoteng K., Jitsue S., Cheevadhanarak S.
Publisher: Springer
Publication year: 2008
Journal: Applied Microbiology and Biotechnology (0175-7598)
Volume number: 80
Issue number: 3
Start page: 499
End page: 506
Number of pages: 8
ISSN: 0175-7598
eISSN: 1432-0614
Languages: English-Great Britain (EN-GB)
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Abstract
Molecular and biochemical studies investigating the biosynthesis of gamma-linolenic acid (GLA), a nutritionally important polyunsaturated fatty acid, were implemented in Mucor rouxii by supplementation with exogenous fatty acids. Compared to the fatty acid-free cultures, addition of C18:2Δ9,12 to the cultures showed up to threefold decrease in the GLA content from the beginning of the culture, whereas a significantly increased GLA amount (P≤0.05) was found after 9 h of growth in the logarithmic cultures fed with stearic acid or oleic acid. Time-course studies of gene expression showed concomitant changes in the messenger RNA (mRNA) levels of the M. rouxii Δ6-, Δ9-, and Δ12-desaturases upon exposure to fatty acids, and these responses were rapid and transient. However, the expression profiles were different depending on the type of exogenous fatty acids supplementing the cultures. Up-regulation of the three desaturase transcripts was detected after addition of C18:0, whereas supplementation of unsaturated fatty acids led to a decrease in mRNA levels. This study showed that the three desaturase genes involved in fatty acid desaturation in M. rouxii are co-regulated in response to exogenous fatty acids. © 2008 Springer-Verlag.
Keywords
Cell growth, Desaturase, Fatty acid supplementation, Gamma-linolenic acid, Mucor rouxii
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