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Conserved Binding Sites

Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Distal structural elements coordinate a conserved base flipping network.

Douglas M Matje1, Cody T Krivacic, Frederick W Dahlquist

  • 1Department of Chemistry and Biochemistry, University of California , Santa Barbara, California 93106-9510, United States.

Biochemistry
|February 16, 2013
PubMed
Summary
This summary is machine-generated.

DNA methyltransferase M.HhaI uses specific amino acids to flip a cytosine base for modification. Serine 85 accelerates flipping, while glycine 98 acts as a hinge, enabling enzyme-DNA interactions.

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Area of Science:

  • Enzymology
  • Molecular Biology
  • DNA Repair

Background:

  • DNA modification enzymes facilitate base flipping for repair and regulation.
  • The base flipping mechanism in DNA methyltransferase M.HhaI is not fully understood.
  • Characterizing the role of individual amino acids in base flipping is crucial.

Purpose of the Study:

  • To elucidate the role of specific amino acids in the base flipping process mediated by M.HhaI.
  • To understand how M.HhaI coordinates DNA and enzyme rearrangements for cytosine flipping.
  • To investigate the contribution of serine 85, serine 87, and glycine 98 to base flipping and enzyme function.

Main Methods:

  • Site-directed mutagenesis of M.HhaI.
  • Biochemical assays to assess enzyme activity and DNA interactions.
  • Analysis of conformational changes during base flipping.

Main Results:

  • M.HhaI initiates base flipping prior to catalytic loop closure.
  • Conserved serine 85 accelerates base flipping and maintains DNA backbone distortion.
  • Glycine 98 functions as a hinge, crucial for catalytic loop conformational flexibility and stabilization.

Conclusions:

  • M.HhaI employs a coordinated mechanism involving distal residues to achieve base flipping.
  • Serine 85 and glycine 98 play critical roles in the base flipping process.
  • Enzyme-mediated base flipping transforms substrate recognition into efficient catalysis.