کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10820557 | 1060716 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Cloning and functional characterisation of polyunsaturated fatty acid elongases of marine and freshwater teleost fish
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Cloning and functional characterisation of polyunsaturated fatty acid elongases of marine and freshwater teleost fish Cloning and functional characterisation of polyunsaturated fatty acid elongases of marine and freshwater teleost fish](/preview/png/10820557.png)
چکیده انگلیسی
Enzymes that lengthen the carbon chain of polyunsaturated fatty acids are key to the biosynthesis of the highly unsaturated fatty acids, arachidonic, eicosapentaenoic and docosahexaenoic acids from linoleic and α-linolenic acids. A Mortierella alpina cDNA polyunsaturated fatty acid elongase sequence identified mammalian, amphibian, zebrafish and insect expressed sequence tags (ESTs) in GenBank. Consensus primers were designed in conserved motifs and used to isolate full length cDNA from livers of several fish species by Rapid Amplification of cDNA Ends (RACE). The amplified cDNAs encoded putative open reading frames (ORFs) of 288-294 amino acids that were highly conserved among the fish species. Heterologous expression in yeast, Saccharomyces cerevisiae, demonstrated that all of the ORFs encoded elongases with the ability to lengthen polyunsaturated fatty acid substrates with chain lengths from C18 to C22 and also monounsaturated fatty acids, but not saturated fatty acids. There were differences in the functional competence of the elongases from different fish species. Most of the fish elongases showed a pattern of activity towards different fatty acid substrates in the rank order C18 > C20 > C22, although the tilapia and turbot elongases had similar activity towards 18 : 4n â 3 and 20 : 5n â 3. The fish elongases generally showed greater activity or similar activities with n â 3 than with n â 6 homologues, with the exception of the cod enzyme which was more active towards n â 6 fatty acids.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology - Volume 142, Issue 3, November 2005, Pages 342-352
Journal: Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology - Volume 142, Issue 3, November 2005, Pages 342-352
نویسندگان
Morris K. Agaba, Douglas R. Tocher, Xiaozhong Zheng, Cathryn A. Dickson, James R. Dick, Alan J. Teale,