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J. Biol. Chem., Vol. 264, Issue 7, 3750-3757, 03, 1989

A novel cDNA extension procedure. Isolation of chicken fatty acid synthase cDNA clones

SS Chirala, R Kasturi, M Pazirandeh, DT Stolow, WY Huang and SJ Wakil
Verna and Marrs McLean Department of Biochemistry, Baylor College of Medicine, Houston, Texas 77030.

We have developed a simple and versatile cDNA extension method using lambda-exonuclease-generated single-stranded DNA as a primer. This plasmid-based cDNA extension method can be used to synthesize unidirectional extensions of the existing cDNA clones or subcloned fragments of the untranslated and exon regions of genomic DNA clones. The method is simple to use and involves no addition of linkers or tailing. We have successfully used this method to isolate 4.6 kilobase pairs of chicken fatty acid synthase cDNA clones, starting from the fragment of a genomic clone coding for the untranslated region of the fatty acid synthase mRNA. About 2.8 kilobase pairs of the cDNA coding for the chicken fatty acid synthase has been sequenced. The sequence has an open reading frame coding for 945 amino acids of the fatty acid synthase. In the sequence, we have identified the enoyl reductase, NADPH binding region, a putative beta-ketoacyl reductase region, and the entire sequences of acyl carrier protein and the thioesterase domains. The arrangement of these partial activities in this sequence confirms the arrangement of these activities as determined through partial proteolytic mapping studies. The amino acid sequence of chicken fatty acid synthase deduced from cDNA sequences shows a high degree of homology with the rat fatty acid synthase sequence, suggesting that these multifunctional proteins are conserved evolutionarily.
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