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Currently described substrates of the bacterial Tat protein transport system are directed for export by signal peptides containing a pair of invariant arginine residues. The signal peptide of the TtrB subunit of Salmonella enterica tetrathionate reductase contains a single arginine residue but is nevertheless able to mediate Tat pathway transport. This naturally occurring example of a Tat signal peptide...
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...
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