Molecular cloning of fatty acid synthetase genes from Saccharomyces cerevisiae
- PMID: 6311818
Molecular cloning of fatty acid synthetase genes from Saccharomyces cerevisiae
Abstract
Fatty acid synthetase from Saccharomyces cerevisiae is a multifunctional enzyme which catalyzes the synthesis of long chain fatty acids from acetyl- and malonyl-CoA. The enzyme is composed of two nonidentical subunits, alpha (Mr = 212,000) and beta (Mr = 203,000), which are coded for by two unlinked genes FAS2 and FAS1, respectively. Individual yeast strains containing mutations in either of the FAS genes were transformed with a bank of yeast DNA sequences in the vector YEp13. Plasmids YEpFAS1 and YEpFAS2 were selected by their ability to complement the fas1 or fas2 mutations, respectively. Additionally, we utilized an immunologic screening of a second yeast DNA bank and selected two clones 33F1 and 102B5 which produce antigenically reactive material to anti-yeast fatty acid synthetase antibodies. Through Southern hybridization experiments and restriction endonuclease mapping, a region of 5.3 kilobase pairs of 33F1 was shown to be homologous with YEpFAS1, and a span of 3.4 kilobase pairs of 102B5 was homologous with YEpFAS2. These experiments identify the yeast DNA sequences cloned into 33F1 as originating from the FAS1 gene and those DNA sequences in 102B5, from the FAS2 gene.
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