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Acyl Carrier Protein

VIII. STUDIES OF ACYL CARRIER PROTEIN AND COENZYME A IN ESCHERICHIA COLI PANTOTHENATE OR -ALANINE AUXOTROPHS

From the ¹ From the Section on Comparative Biochemistry, National Heart Institute, National Institutes of Health, Bethesda, Maryland 20014

A pantothenate-requiring auxotroph and a ß-alanine-requiring auxotroph of Escherichia coli were grown in media supplemented with radioactive pantothenate or ß-alanine, respectively. Analyses of extracts of these organisms showed that acyl carrier protein accounts for approximately 90% of the radioactivity associated with the protein fraction. Studies with the pantothenate auxotroph indicate that under the conditions of these experiments acyl carrier protein and coenzyme A are the major cellular constituents which contain pantothenate. In addition, it was found that the cellular concentration of coenzyme A is directly related to the concentration of pantothenate in the medium, whereas the concentration of acyl carrier protein does not vary under a variety of growth conditions.

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