1q5f
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(New page: 200px<br /><applet load="1q5f" size="450" color="white" frame="true" align="right" spinBox="true" caption="1q5f" /> '''NMR Structure of Type IVb pilin (PilS) from ...)
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Revision as of 01:28, 25 November 2007
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NMR Structure of Type IVb pilin (PilS) from Salmonella typhi
Overview
The structure of the N-terminal-truncated Type IVb structural pilin, (t-PilS) from Salmonella typhi was determined by NMR. Although, topologically similar to the recently determined x-ray structure of pilin, from Vibrio cholerae toxin-coregulated pilus, the only Type IVb pilin with, known structure, t-PilS contains many distinct structural features. The, protein contains an extra pair of beta-strands in the N-terminal alphabeta, loop that align with the major beta-strands to form a continuous, 7-stranded antiparallel beta-sheet. The C-terminal disulfide-bonded region, of t-PilS is only half the length of that of toxin-coregulated pilus, pilin. A model of S. typhi pilus has been proposed and mutagenesis studies, suggested that residues on both the alphabeta loop and the C-terminal, disulfide-bonded region of PilS might be involved in binding specificity, of the pilus. This model structure reveals an exposed surface between, adjacent subunits of PilS that could be a potential binding site for the, cystic fibrosis transmembrane conductance regulator.
About this Structure
1Q5F is a Single protein structure of sequence from Salmonella typhi. Full crystallographic information is available from OCA.
Reference
NMR structure of a type IVb pilin from Salmonella typhi and its assembly into pilus., Xu XF, Tan YW, Lam L, Hackett J, Zhang M, Mok YK, J Biol Chem. 2004 Jul 23;279(30):31599-605. Epub 2004 May 24. PMID:15159389
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