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Characterization of three-subunit chloroplast coupling factor.

B Mitra1, G G Hammes

  • 1Department of Chemistry, Cornell University, Ithaca, New York 14853.

Biochemistry
|January 12, 1988
PubMed
Summary
This summary is machine-generated.

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Removing delta- and epsilon-polypeptides from chloroplast coupling factor 1 (CF1) yields a stable, active ATPase. This modified enzyme, CF1(-delta, epsilon), retains similar kinetics and nucleotide binding sites to the original CF1.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Plant Physiology

Background:

  • Chloroplast coupling factor 1 (CF1) is essential for ATP synthesis.
  • The delta- and epsilon-polypeptides of CF1 are thought to play regulatory roles.

Purpose of the Study:

  • To investigate the functional and structural roles of delta- and epsilon-polypeptides in CF1.
  • To characterize the ATPase activity and nucleotide binding of CF1 after removal of delta- and epsilon-polypeptides.

Main Methods:

  • Enzymatic assays to determine steady-state kinetics of ATP hydrolysis.
  • Nucleotide binding studies to identify and characterize binding sites.
  • Fluorescence resonance energy transfer (FRET) to map distances within the enzyme.

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Main Results:

  • CF1(-delta, epsilon) exhibited stable, active ATPase activity with kinetics similar to activated CF1.
  • Three nucleotide binding sites were identified in CF1(-delta, epsilon): a non-dissociable ADP site, a tight MgATP site, and a low-affinity site for ADP/ATP.
  • FRET analysis showed minimal changes in distances between the gamma-subunit and nucleotide sites compared to CF1.

Conclusions:

  • Removal of delta- and epsilon-polypeptides does not significantly alter the core structure, ATPase kinetics, or nucleotide binding properties of CF1.
  • These findings suggest that delta- and epsilon-polypeptides may not be essential for the catalytic activity or basic nucleotide binding of CF1.