Reference: Meurer G, et al. (1992)
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Abstract
The Brevibacterium ammoniagenes fatty acid synthetase (FAS) gene was isolated from a series of overlapping clones by both immunological and plaque hybridization screening of two independent gene libraries. From the isolated DNA a contiguous segment of 10,549 bp was sequenced in both directions. The sequenced DNA contained a very long (9312 nucleotides) open reading frame coding for a protein of 3104 amino acids and with a molecular mass of 327,466 daltons. Based on characteristic sequence motifs known from other FAS systems, seven different FAS active centres were identified at distinct locations within the polypeptide chain. Only one component enzyme, the 3-hydroxydecanoyl beta, gamma-dehydratase, has not yet been localized definitively within the gene. Translation is presumed to start from a GUG triplet located 25 nucleotides downstream of the transcriptional initiation site. There is a canonical Shine-Dalgarno sequence just before this start codon. Comparison of the B. ammoniagenes FAS sequence with those of other known fatty acid synthetases revealed a particularly high degree of similarity to the products of the two yeast genes, FAS1 and FAS2 (30% identical and 46% identical plus closely related amino acids). This similarity extends over the entire length of the genes and involves not only the primary sequences of individual component enzymes but also their sequential order within the multifunctional proteins. These data, together with those on the structure of other fatty acid synthetases, are interpreted in terms of a contribution of both primary structure and subunit cooperation to a conserved topology of functional domains common to all type I FAS complexes.
- Reference Type
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Journal Article |
Research Support, Non-U.S. Gov't
- Authors
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Meurer G,
Biermann G,
Schütz A,
Harth S,
Schweizer E
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