Nucleic Acids Research, 1989, Vol. 17, No. 2 567-586
© 1989
ENZYMOLOGY |
Rat mammary gland fatty acid synthase: localization of the constituent domains and two functional polyadenylation/termination signals in the cDNA
Institut für Mikrobiologie und Biochemie der Universität Erlangen-Nümberg, Staudtstraße 5, D-8520 Erlangen, FRG
*To whom correspondence should be addressed.
Received October 21, 1988. Revised December 16, 1988. Accepted December 16, 1988.
The rat fatty acid synthase (FAS) is active only as a dimer, although the eight component functions are contained in a single polypeptide chain. Using mRNA from lactating rat mammary glands a cDNA expression library was established. With the overlapping immunologically positive clones we have an 8.9kb cDNA sequence for rat FAS. In the 3'-nontranslated region of the rat FAS cDNA we find a prototype polyadenylation/termination signal and 779 nucleotides upstream, a mutated one. Both of these polyadenylation/termination signals are used and give rise to two equally abundant mRNA species which are coordinately regulated. In the derived amino acid sequence we could locate six of the eight component functions; their order is NH2– beta-ketoacyl synthase - acetyl/malonyl transferases -enoyl reductase - acyl carrier protein - thioesterase -COOH. Comparison of FAS from different sources shows that the primary sequence is conserved only for the active residues and the amino acids in their immediate vicinity.
+Present addresses: Department of Biotechnology, Ciba-Geigy AG, Basel, Switzerland
Department of Biology, University of California, Los Angeles, CA 90024, USA
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