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ENZYME ACTIVITIES INVOLVED IN ATP SYNTHESIS IN SEEDS

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Cell-free extracts from seeds of onion (Allium cepa), peas (Pisum sativum) and lettuce (Lactuca sativa) exhibit ATP synthesis in the presence of phosphoenolpyruvate (PEP) and AMP. The activity is stimulated by low amounts of ADP or ATP. Reduced NAD replaced AMP in some seeds, and increased the rate of ATP synthesis in the presence of AMP in others. If ADP and PEP were used as substrates (pyruvate kinase), a 5- to 50- times faster ATP synthesis was observed. Examination of enzymes from pea and onion seed extracts revealed that three different enzymes are involved in the conversion of AMP to ATP: (a) pyruvate kinase (EC 2.7.1.40), (b) adenylate kinase (EC 2.7.4.3) and (c) an activity which results in formation of ADP from reduced NAD. The overall activity for ATP synthesis from AMP is stimulated by K+, Mg2+, Mn2+ and Co+, and is inhibited by Na+ and Ca2+. A scheme for the possible pathway of ATP synthesis in seeds at the early stage of germination is presented.

Affiliations: 1: Agricultural Research Organization, The Volcani Center

10.1080/0021213X.1980.10676896
/content/journals/10.1080/0021213x.1980.10676896
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1. Atkins C.A., Flinn A.M."Carbon dioxide fixation in the carbon economy of developing seeds of Lupinus album (L.)."Plant Physiol.1978Vol 62486490
2. De Luca V., Dennis D.T."Isoenzyme of pyruvate kinase in proplastids from developing castor bean endosperm."Plant Physiol.1978Vol 6110371039
3. Duggleby R.G., Dennis D.T."The characterization and regulatory properties of pyruvate kinase from cotton seeds."Arch. Biochem. Biophys.1973Vol 155270277
4. Hedey C.L., Havey D.M., Keely R.S."Role of PEP-carboxylase during seed development in Pisum sativum"Nature (Lond.)1975Vol 258352354
5. Lowry O.H., Rosebrough N.J., Farr A.L., Randel R.S."Protein measurements with the folinphenol reagent."J. Biol. Chem.1951Vol 193266275
6. Perl M."Phosphoenolpyruvate-carboxylase activity in cotton and Sorghum seeds and its relation to seedling development."Plant (Berl.)1978aVol 139239243
7. Perl M."A possible role of malate dehydrogenase activity in seedling development of cotton (Gossypium hirsutum)."Isr. J. Bot.1978bVol 275461
8. Perl M."AMP and phosphoenolpyruvate-dependent ATP synthesis in lettuce seeds."Isr. J. Bot.1979/80Vol 29312317
9. Perl M."An ATP-synthesizing system in seeds. Planta (in press)."1980
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/content/journals/10.1080/0021213x.1980.10676896
1980-05-13
2018-08-15

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