Reference: Wieland F, et al. (1979) Studies on the multi-enzyme complex of yeast fatty-acid synthetase. Reversible dissociation and isolation of two polypeptide chains. Eur J Biochem 94(1):189-97

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Abstract


1. The multi-enzyme complex of fatty acid synthetase, Mr 2300,000, was dissociated by acylation with dimethyl maleic anhydride under conditions which lead to an acylation of about 30% of the epsilon amino groups of lysine. The complete dissociation into the subunits alpha and beta is demonstrated by analytical ultracentrifugation as well as disc gel electrophoresis. 2. This dissociation is reversible. Hydrolysis of the resulting protein dicarboxylic acid monoamides under mildly acidic conditions leads to the unmodified subunits, which can be reconstituted to form a complex displaying about 60% of the original activity. 3. The subunits were isolated by sucrose-density-gradient centrifugation and studied for the different partial enzyme activities involved in long-chain fatty acid synthesis: malonyl, palmitoyl and acetyl transferase, enoyl reductase and dehydratase were shown to be exclusive functions of the beta chains of the complex, confirming a pentafunctional role of this subunit.

Reference Type
Journal Article
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Wieland F, Renner L, Verfürth C, Lynen F
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