Abstract:
:The TonB protein is required for several outer membrane transport processes in bacteria. A short 33-residue peptide segment of TonB has been studied by 1H and 13C nuclear magnetic resonance spectroscopy. The sequence of this peptide segment contains multiple Glu-Pro and Lys-Pro dipeptide repeats that maintain rigid, elongated structures and flank a short connecting segment that adopts a beta-strand configuration. This TonB peptide is shown to interact specifically with the FhuA protein, the outer membrane receptor for ferrichrome-iron, providing the first direct evidence that the TonB protein interacts with outer membrane receptors. Interaction with the FhuA protein involves the extended structural element containing positively charged Lys-Pro repeats, and suggests a functional role for this segment of the TonB protein. As TonB is anchored in the cytoplasmic membrane the protein must, uniquely, span the periplasm. These data, together with studies described in the accompanying paper, suggest a model by which TonB serves to transduce conformational information over extended distances, from the cytoplasmic membrane to the outer membrane.
journal_name
J Mol Bioljournal_title
Journal of molecular biologyauthors
Brewer S,Tolley M,Trayer IP,Barr GC,Dorman CJ,Hannavy K,Higgins CF,Evans JS,Levine BA,Wormald MRdoi
10.1016/S0022-2836(99)80008-4subject
Has Abstractpub_date
1990-12-20 00:00:00pages
883-95issue
4eissn
0022-2836issn
1089-8638pii
S0022-2836(99)80008-4journal_volume
216pub_type
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