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Effects of gibberellic acid and L-methionine on C1 metabolism in aerated carrot disk by Paul Fedec; Edwin Albert Cossins is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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Aeration of carrot storage tissue disks in water was accompanied by net folate synthesis and by changes in the specific activities of key folatedependent enzymes. Disks aerated in 0.1 mM gibberellic acid (GA,) for 48 hr containnd higher concentrations of methyltetrahydrofolates but aeration in 5 mM L-methionine reduced net folate synthesis. Gibberellic acid also increased the specific activities of 5,10-methylenetetrahydrofolate reductase (EC. 1.1.1.68), serine hydroxymethyltransfe&e (E.C. 2.f.2.1) and 5-methyltetrahydrofolate: homocysteine transmethylase. The levels of these enzymes in disks aerated in t-methionine (5 mM) were comparable or slightly higher than those of disks aerated in water. Activity of the reductase and lO-formyltetrahydrofolate synthetase (E.C. 6.3.4.3) was inhibited by L-methionine in vitru. Aeration increased ability to incorporate formate [14C] into serine, glycine and methionine. Disks aerated for 36 hr in 0.1 mM GA, incorporated greater amounts of "%Z into free methionine but those aerated in L-methionine (5 mM) had less ability to metabolize formate and the specific radioactivities L of free glycine, serine and methionine were low.

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Author

Paul Fedec; Edwin Albert Cossins

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0031-9422)

Published

1976

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)