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Proteolysis of truncated hemolysin A yields a stable dimerization interface.

Walter R P Novak1, Basudeb Bhattacharyya2, Daniel P Grilley2

  • 1Department of Chemistry, Wabash College, 301 West Wabash Avenue, Crawfordsville, IN 47933, USA.

Acta Crystallographica. Section F, Structural Biology Communications
|March 15, 2017
PubMed
Summary
This summary is machine-generated.

Structural analysis of Proteus mirabilis hemolysin A (HpmA265) reveals distinct dimeric and tetrameric assemblies. High-salt conditions induce novel interfaces, potentially mimicking template-assisted hemolytic activity.

Keywords:
Proteus mirabilisalternate crystal formshemolysin Aproteolysistwo-partner secretionβ-helix

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Area of Science:

  • Microbiology
  • Structural Biology
  • Biochemistry

Background:

  • Hemolysin A (HpmA265) from Proteus mirabilis is a key virulence factor.
  • Understanding its structural dynamics is crucial for elucidating its hemolytic mechanism.

Purpose of the Study:

  • To determine the crystal structures of wild-type and variant HpmA265 under varying salt conditions.
  • To investigate the structural basis for different oligomeric states and their functional implications.

Main Methods:

  • X-ray crystallography was employed to resolve the three-dimensional structures.
  • Analysis of protein interfaces and hydrogen bonding networks was performed.

Main Results:

  • Wild-type HpmA265 adopts a dimeric structure via on-edge main-chain hydrogen bonds (residues 243-263) in low-salt conditions.
  • High-salt structures of Y134A and Q125A-Y134A variants exhibit a new dimeric interface (residues 203-215) and an unprecedented tetramer.
  • Additional proteolysis after Tyr240 in variants facilitates the formation of these new interfaces and an eight-stranded antiparallel β-sheet.

Conclusions:

  • Salt concentration and specific mutations significantly influence HpmA265 oligomerization and interface formation.
  • The observed high-salt interfaces may mimic the structural arrangements involved in the protein's hemolytic activity.