Napier J A, Hey S J, Lacey D J, Shewry P R
IACR-Long Ashton Research Station, Department of Agricultural Sciences, University of Bristol, Long Ashton, Bristol BS18 9AF, U.K.
Biochem J. 1998 Mar 1;330 ( Pt 2)(Pt 2):611-4. doi: 10.1042/bj3300611.
We identified a cDNA expressed sequence tag from an animal (the nematode worm Caenorhabditis elegans) that showed weak similarity to a higher-plant microsomal Delta6-desaturase. A full-length cDNA clone was isolated and expressed in the yeast Saccharomyces cerevisiae. This demonstrated that the protein encoded by the C. elegans cDNA was that of a fatty acid Delta6-desaturase, as determined by the accumulation of gamma-linolenic acid. The C. elegans Delta6-desaturase contained an N-terminalcytochrome b5 domain, indicating that it had a similar structure to that of the higher-plant Delta6-desaturase. The C. elegans Delta6-desaturase mapped to cosmid W08D2, a region of chromosome III. This is the first example of a Delta6-desaturase isolated from an animal and also the first example of an animal desaturase containing a cytochrome b5 domain.
我们从一种动物(线虫秀丽隐杆线虫)中鉴定出一个cDNA表达序列标签,它与高等植物微粒体Δ6-去饱和酶有微弱的相似性。分离出一个全长cDNA克隆并在酿酒酵母中表达。这表明,由秀丽隐杆线虫cDNA编码的蛋白质是一种脂肪酸Δ6-去饱和酶,这是通过γ-亚麻酸的积累确定的。秀丽隐杆线虫的Δ6-去饱和酶含有一个N端细胞色素b5结构域,表明它与高等植物Δ6-去饱和酶具有相似的结构。秀丽隐杆线虫的Δ6-去饱和酶定位于粘粒W08D2,即第三条染色体的一个区域。这是从动物中分离出的Δ6-去饱和酶的第一个例子,也是含有细胞色素b5结构域的动物去饱和酶的第一个例子。