Abstract:
:The amination of alpha-ketoglutarate (alpha-KG) by NADH-glutamate dehydrogenase (GDH) obtained from Sephadex G-75 treated crude extracts from shoots of 5-day-old seedlings was stimulated by the addition of Ca(2+). The NADH-GDH purified 161-fold with ammonium sulfate, DEAE-Toyopearl, and Sephadex G-200 was also activated by Ca(2+) in the presence of 160 micromolar NADH. However, with 10 micromolar NADH, Ca(2+) had no effect on the NADH-GDH activity. The deamination reaction (NAD-GDH) was not influenced by the addition of Ca(2+).About 25% of the NADH-GDH activity was solubilized from purified mitochondria after a simple osmotic shock treatment, whereas the remaining 75% of the activity was associated with the mitochondrial membrane fraction. When the lysed mitochondria, mitochondrial matrix, or mitochondrial membrane fraction was used as the source of NADH-GDH, Ca(2+) had little effect on its activity. The mitochondrial fraction contained about 155 nanomoles Ca per milligram of mitochondrial protein, suggesting that the NADH-GDH in the mitochondria is already in an activated form with regard Ca(2+). In a simulated in vitro system using concentrations of 6.4 millimolar NAD, 0.21 millimolar NADH, 5 millimolar alpha-KG, and 5 millimolar glutamate thought to occur in the mitochondria, together with 1 millimolar Ca(2+), 10 and 50 millimolar NH(4) (+), and purified enzyme, the equilibrium of GDH was in the direction of glutamate formation.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Yamaya T,Oaks A,Matsumoto Hdoi
10.1104/pp.76.4.1009subject
Has Abstractpub_date
1984-12-01 00:00:00pages
1009-13issue
4eissn
0032-0889issn
1532-2548journal_volume
76pub_type
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