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Characterization of Cfa1, a Monofunctional Acyl Carrier Protein Involved in the Biosynthesis of the Phytotoxin Coronatine

ABSTRACT Cfa1 was overproduced in Escherichia coli and Pseudomonas syringae, and the degree of 4′-phosphopantetheinylation was determined. The malonyl-coenzyme A:acyl carrier protein transacylase (FabD) of P. syringae was overproduced and shown to catalyze malonylation of Cfa1, suggesting that FabD plays a role in coronatine biosynthesis. Highly purified Cfa1 did not exhibit self-malonylation activity.