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Related Experiment Videos

Function of tightly bound nucleotides on membrane-bound chloroplast coupling factor.

D Leckband1, G G Hammes

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

Biochemistry
|May 17, 1988
PubMed
Summary

Spinach chloroplast coupling factor 1 (CF1) has two nucleotide binding sites. Their kinetic behavior during ATP synthesis and hydrolysis is identical for soluble and membrane-bound forms.

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Area of Science:

  • Biochemistry
  • Plant Physiology
  • Molecular Biology

Background:

  • Chloroplast coupling factor 1 (CF1) is crucial for ATP synthesis in photosynthesis.
  • Understanding nucleotide binding kinetics is key to elucidating CF1's function.
  • Previous studies focused on soluble CF1, leaving membrane-bound kinetics less clear.

Purpose of the Study:

  • To investigate the kinetic behavior of tightly bound nucleotides on spinach chloroplast coupling factor 1 (CF1).
  • To compare nucleotide binding and dissociation under phosphorylating and non-phosphorylating conditions.
  • To determine if nucleotide binding sites on soluble and membrane-bound CF1 are functionally equivalent.

Main Methods:

  • Spinach CF1 was labeled with radioactive ADP and/or ATP.

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  • Labeled CF1 was reconstituted with thylakoid membranes depleted of native CF1.
  • Nucleotide incorporation and dissociation rates were measured under varying conditions.

    • Main Results:

    • One nucleotide binding site requires light for ADP incorporation/dissociation, occurring at similar rates whether ATP is synthesized or not.
    • This site's initial rate is slower than ATP synthesis, but nucleotide exchange is rapid during steady-state ATP synthesis.
    • A second site exhibits very tight MgATP binding, with no dissociation or impact on ATP synthesis rate, mirroring soluble CF1 behavior.

    Conclusions:

    • The kinetic properties and binding characteristics of nucleotide sites on soluble and membrane-bound CF1 are essentially identical.
    • This suggests a conserved functional mechanism for nucleotide interaction across different CF1 states.
    • The findings provide critical insights into the catalytic mechanism of ATP synthase in chloroplasts.