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Significance of fatty acid supplementation on profiles of cell growth, fatty acid, and gene expression of three desaturases in Mucor rouxii

  • Applied Microbial and Cell Physiology
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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.

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Acknowledgment

This research work was supported by grants from King Mongkut’s University of Technology Thonburi and the National Center for Genetic Engineering and Biotechnology, Thailand.

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Authors and Affiliations

  1. Pilot Plant Development and Training Institute, King Mongkut’s University of Technology Thonburi, Bangkhuntien, Bangkok, 10150, Thailand

    Sakda Khoomrung, Sompit Jitsue & Supapon Cheevadhanarak

  2. Biochemical Engineering and Pilot Plant Research and Development Unit, National Center for Genetic Engineering and Biotechnology at King Mongkut’s University of Technology Thonburi, Bangkhuntien, Bangkok, 10150, Thailand

    Kobkul Laoteng

  3. School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi, Bangkhuntien, Bangkok, 10150, Thailand

    Supapon Cheevadhanarak

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  1. Sakda Khoomrung
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  2. Kobkul Laoteng
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  3. Sompit Jitsue
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Correspondence to Kobkul Laoteng.

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Khoomrung, S., Laoteng, K., Jitsue, S. et al. Significance of fatty acid supplementation on profiles of cell growth, fatty acid, and gene expression of three desaturases in Mucor rouxii . Appl Microbiol Biotechnol 80, 499–506 (2008). https://doi.org/10.1007/s00253-008-1569-0

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  • DOI: https://doi.org/10.1007/s00253-008-1569-0

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