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Preproteins targeted to the Sec-independent protein transport systems of plant thylakoids and of bacteria both have unusual transfer peptides bearing a consensus twin-arginine motif. Possible mechanistic similarity between the two Sec-independent transport pathways was investigated by assessing the ability of bacterial twin-arginine transfer peptides to direct thylakoid import. High efficiency import was observed. This process was demonstrated to occur specifically via the Sec-independent deltapH pathway and to depend on an intact twin-arginine motif on the transfer peptide. These results provide strong evidence for the operation of mechanistically related Sec-independent protein transport pathways in chloroplasts and bacteria.

Original publication

DOI

10.1016/s0014-5793(98)00790-x

Type

Journal article

Journal

FEBS Lett

Publication Date

24/07/1998

Volume

431

Pages

339 - 342

Keywords

Amino Acid Sequence, Bacterial Proteins, Biological Transport, Hydrogen-Ion Concentration, Intracellular Membranes, Molecular Sequence Data, Plants, Signal Transduction