J. Bacteriol., May 1996, 2662-2667, Vol 178, No. 9
Copyright © 1996, American Society for Microbiology

The apparent coupling between synthesis and posttranslational modification of Escherichia coli acyl carrier protein is due to inhibition of amino acid biosynthesis

DH Keating, Y Zhang and JE Cronan Jr
Department of Microbiology, University of Illinois, Urbana 61801, USA.

Acyl carrier protein (ACP) is modified on serine 36 by the covalent posttranslational attachment of 4'-phosphopantetheine from coenzyme A (CoA), and this modification is required for lipid biosynthesis. Jackowski and Rock (J. Biol. Chem 258:15186-15191, 1983) reported that upon depletion of the CoA pool by starvation for a CoA precursor, no accumulation of the unmodified form of ACP (apo-ACP) was detected. We report that this lack of apo-ACP accumulation results from decreased translation of the acpP mRNAs because of the limitation of the synthesis of glutamate and other amino acids made directly from tricarboxylic acid cycle intermediates.

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