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The Escherichia coli Tat apparatus is a protein translocation system that serves to export folded proteins across the inner membrane. The integral membrane proteins TatA, TatB and TatC are essential components of this pathway. Substrate proteins are directed to the Tat apparatus by specialized N-terminal signal peptides bearing a consensus twin-arginine sequence motif. Here we have systematically examined the Tat complexes that can be purified from overproducing strains. Our data suggest that the TatA, TatB and TatC proteins are found in at least two major types of high molecular mass complex in detergent solution, one consisting predominantly of TatA but with a small quantity of TatB, and the other based on a TatBC unit but also containing some TatA protein. The latter complex is shown to be capable of binding a Tat signal peptide. Using an alternative purification strategy we show that it is possible to isolate a TatABC complex containing a high molar excess of the TatA component.

Type

Journal article

Journal

J Mol Biol

Publication Date

04/10/2002

Volume

322

Pages

1135 - 1146

Keywords

Arginine, Biological Transport, Escherichia coli, Escherichia coli Proteins, Macromolecular Substances, Membrane Transport Proteins, Protein Binding, Protein Sorting Signals, Protein Subunits, Recombinant Proteins