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Chloroplast SecA and Escherichia coli SecA Have Distinct Lipid and Signal Peptide Preferences

Changqi Sun, Sharyn L. Rusch, Jinoh Kim, and Debra A. Kendall^*

Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut 06269-3125

Received 12 October 2006/ Accepted 20 November 2006

Like prokaryotic Sec-dependent protein transport, chloroplasts utilize SecA. However, we observe distinctive requirements for the stimulation of chloroplast SecA ATPase activity; it is optimally stimulated in the presence of galactolipid and only a small fraction of anionic lipid and by Sec-dependent thylakoid signal peptides but not Escherichia coli signal peptides.

Published ahead of print on 1 December 2006.

Present address: Division of Biology and Medicine, Brown University, Providence, RI 02912.

Present address: Howard Hughes Medical Institute, Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720.