Abstract:
:Phosphoenolpyruvate partially inhibits the accumulation of Ca(2+) in isolated mung bean (Phaseolus aureus Roxb.) mitochondria. Succinate-supported Ca(2+) uptake is twice as sensitive to phosphoenolpyruvate inhibition as is NADH- or malate/pyruvate-supported Ca(2+) uptake. Pyruvate, atractylate, and ATP, but not ITP, reverse the phosphoenolpyruvate-induced inhibition. Oxaloacetic acid inhibits succinate-supported Ca(2+) uptake completely while partially inhibiting NADH-supported Ca(2+) uptake. The oxaloacetate inhibition of NADH-supported Ca(2+) uptake is greater than that produced by phosphoenolpyruvate. It is suggested that inhibition of Ca(2+) uptake is due to the conversion of phosphoenolpyruvate into oxaloacetate via phosphoenolpyruvate carboxykinase, with oxaloacetate responsible for the actual inhibition of Ca(2+) uptake.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Graesser RJdoi
10.1104/pp.59.2.126subject
Has Abstractpub_date
1977-02-01 00:00:00pages
126-8issue
2eissn
0032-0889issn
1532-2548journal_volume
59pub_type
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