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Tightly bound nucleotides affect phosphate binding to mitochondrial F1-ATPase
FEBS Letters
|March 25, 1985
Summary
Native F1-adenosine triphosphatase (ATPase) binds inorganic phosphate only when specific nucleotides like ATP or ADP are present. Nucleotide depletion prevents phosphate binding, highlighting the catalytic site's role in this crucial enzyme interaction.
Area of Science:
- Biochemistry
- Enzyme kinetics
- Molecular biology
Background:
- F1-adenosine triphosphatase (F1-ATPase) is a key enzyme in cellular energy production.
- The enzyme's function is intrinsically linked to the binding of nucleotides and inorganic phosphate.
- Understanding these interactions is crucial for elucidating ATP synthesis mechanisms.
Purpose of the Study:
- To investigate the interaction between inorganic phosphate and F1-adenosine triphosphatase (F1-ATPase).
- To determine the role of tightly bound nucleotides in inorganic phosphate binding.
- To identify the specific nucleotides that restore phosphate binding capacity.
Main Methods:
- Studying inorganic phosphate interaction with native F1-ATPase.
- Analyzing nucleotide-depleted F1-ATPase.
- Assessing the effect of various nucleotide additions (ATP, ADP, GTP, GDP, AMP) on phosphate binding.
Main Results:
- F1-adenosine triphosphatase (F1-ATPase) depleted of tightly bound nucleotides loses its inorganic phosphate binding ability.
- Addition of adenosine triphosphate (ATP), adenosine diphosphate (ADP), guanosine triphosphate (GTP), and guanosine diphosphate (GDP) restored phosphate binding.
- Adenosine monophosphate (AMP) did not restore phosphate binding.
Conclusions:
- Inorganic phosphate binding to F1-adenosine triphosphatase (F1-ATPase) requires the presence of specific nucleotides.
- Nucleotides influencing phosphate binding are located at the enzyme's catalytic site.
- Adenosine diphosphate (ADP) is likely the initial substrate in the ATP synthesis reaction catalyzed by F1-ATPase.