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The observed sub- stoichiometric substrate binding characteristics of the enzyme are ascribed to this effect. An a priori asymmetry of the complex appears unlikely since the coenzyme-A:FAS transacylation equilibrium may be shifted towards the fully acetylated enzyme in the presence of N- ethylmaleimide. In contrast to the limited acylation capacity of the cytosolic protein 'resting' cytosolic protein enzyme, complete acylation of yeast FAS at all of its 12 SHc and SHp sites is observed under steady-state conditions of fatty acid biosynthesis. Under these conditions, the enzyme exhibits full-site reactivity at its SHp, SHc and OHAc sites, but a concomitant 18-fold cytosolic protein increase in Km of the coenzyme-A:OHAc transacylation reaction keeps the acyl-O-ester content of the acylated enzyme at less than 5% of the total.(ABSTRACT TRUNCATED AT 250 WORDS) This article has been cited by other articles: (Search Google Scholar for Other Citing Articles) E.
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