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Related Experiment Videos

Pentapeptide repeat proteins.

Matthew W Vetting1, Subray S Hegde, J Eduardo Fajardo

  • 1Department of Biochemistry, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, New York 10461, USA.

Biochemistry
|January 4, 2006
PubMed
Summary
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Pentapeptide repeat proteins (PRPs) are a large protein family with unknown functions. The first determined structure, fluoroquinolone resistance protein (MfpA), reveals a novel beta-helix structure that binds DNA gyrase.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Microbiology

Background:

  • The pentapeptide repeat (PRP) protein family comprises over 500 members across prokaryotes and eukaryotes.
  • PRPs feature tandemly repeated amino acid sequences with a conserved consensus motif.
  • The function of most PRP family members remains largely uncharacterized.

Purpose of the Study:

  • To elucidate the structural and functional characteristics of the first determined pentapeptide repeat protein.
  • To investigate the mechanism of action of the fluoroquinolone resistance protein (MfpA) from Mycobacterium tuberculosis.

Main Methods:

  • X-ray crystallography was employed to determine the three-dimensional structure of MfpA.
  • Biochemical assays were used to assess the interaction of MfpA with DNA gyrase.

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Main Results:

  • The structure revealed that pentapeptide repeats form a novel right-handed quadrilateral beta-helix.
  • MfpA functions as a rod-shaped dimer, exhibiting significant structural and electrostatic similarity to DNA.
  • MfpA was shown to bind to DNA gyrase, inhibiting its enzymatic activity.

Conclusions:

  • The determined structure of MfpA provides insights into the folding of pentapeptide repeats and the formation of beta-helices.
  • MfpA's DNA-mimicking properties suggest a potential mechanism for inhibiting DNA gyrase and conferring fluoroquinolone resistance.
  • This study opens avenues for exploring the functions of other uncharacterized PRP family members.