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Investigating Flagella-Driven Motility in Escherichia coli by Applying Three Established Techniques in a Series
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Molecular interaction of flagellar export chaperone FliS and cochaperone HP1076 in Helicobacter pylori

Wendy Wai Ling Lam1, Eui Jeon Woo, Masayo Kotaka

  • 1Centre of Protein Science and Crystallography, Department of Biochemistry, Faculty of Science, The Chinese University of Hong Kong, Hong Kong, China.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|June 29, 2010
PubMed

Insights

Flagellar export chaperone FliS in Helicobacter pylori interacts with HP1076, a protein that enhances FliS function. Structural analysis reveals how HP1076 stabilizes FliS, offering insights into bacterial flagellar assembly.

Area of Science:

  • Microbiology
  • Structural Biology
  • Protein Biochemistry

Background:

  • Flagellar export chaperone FliS is essential for bacterial flagellar assembly and colonization.
  • Previous studies identified potential FliS-interacting proteins in Helicobacter pylori, but their functional roles remain unclear.

Purpose of the Study:

  • To investigate the biophysical interaction between H. pylori FliS and the uncharacterized protein HP1076.
  • To elucidate the structural basis and functional implications of the FliS-HP1076 complex.

Main Methods:

  • Yeast two-hybrid screening (previously).
  • Biophysical interaction studies.
  • X-ray crystallography to determine structures of FliS, HP1076, and their complex.
  • Structural analysis of protein-protein interactions.

Main Results:

  • Demonstrated a direct biophysical interaction between H. pylori FliS and HP1076.
  • HP1076 exhibits cochaperone activity, enhancing FliS folding and function.
  • Crystal structures revealed HP1076 as a helix-rich bundle sharing structural homology with flagellin and FliS.
  • The FliS-HP1076 complex interface is distinct from the flagellin binding site, with helical stacking stabilizing FliS structure.

Conclusions:

  • HP1076 acts as a cochaperone that stabilizes FliS structure and function.
  • The findings provide novel insights into the regulation of flagellar export chaperones.
  • This interaction may have broader implications for understanding other type III secretion system chaperones.

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