Adenosine triphosphatase from rat liver mitochondria: Separate sites involved in ATP hydrolysis and in the reversible, high affinity binding of ADP

Peter L Pedersen

Research output: Contribution to journalArticle

Abstract

Homogeneous ATPase from rat liver mitochondria binds one mole of ADP per mole of enzyme reversibly, and with high affinity (KD = 1-2 μM). The high affinity binding site is highly specific for ADP and dADP. AMP does not bind. Agents which inhibit ATP hydrolysis have little inhibitory effect on the high affinity binding of ADP. These agents include adenylyl imidodiphosphate (AMP-PNP), azide, sucrose, and the divalent cation Mg++. AMP-PNP inhibits ATPase activity in phosphorylating membrane preparations of rat liver mitochondria by about 90 percent, but is without effect on ATP synthesis. These results are consistent with the view that the purified soluble, and the membrane-bound ATPase of rat liver mitochondria contain separate sites involved in ATP hydrolysis and in the reversible, high affinity binding of ADP.

Original languageEnglish (US)
Pages (from-to)610-616
Number of pages7
JournalBiochemical and Biophysical Research Communications
Volume64
Issue number2
DOIs
StatePublished - May 19 1975

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Mitochondria
Liver Mitochondrion
Adenylyl Imidodiphosphate
Liver
Adenosine Diphosphate
Adenosine Triphosphatases
Rats
Hydrolysis
Adenosine Triphosphate
Membranes
Azides
Divalent Cations
Adenosine Monophosphate
Sucrose
Binding Sites
Enzymes

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

Cite this

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AB - Homogeneous ATPase from rat liver mitochondria binds one mole of ADP per mole of enzyme reversibly, and with high affinity (KD = 1-2 μM). The high affinity binding site is highly specific for ADP and dADP. AMP does not bind. Agents which inhibit ATP hydrolysis have little inhibitory effect on the high affinity binding of ADP. These agents include adenylyl imidodiphosphate (AMP-PNP), azide, sucrose, and the divalent cation Mg++. AMP-PNP inhibits ATPase activity in phosphorylating membrane preparations of rat liver mitochondria by about 90 percent, but is without effect on ATP synthesis. These results are consistent with the view that the purified soluble, and the membrane-bound ATPase of rat liver mitochondria contain separate sites involved in ATP hydrolysis and in the reversible, high affinity binding of ADP.

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