The properties of arginine transport in vacuolar membrane vesicles of Neurospora crassa.

We have measured the uptake of arginine into vacuolar membrane vesicles from Neurospora crassa. Arginine transport was found to be dependent on ATP hydrolysis, Mg2+, time, and vesicle protein with transported arginine remaining unmodified after entry into the vesicles. The Mg2+ concentration required for optimal arginine transport varied with the ATP concentration so that maximal transport occurred when the MgATP2- concentration was at a maximum and the concentrations of free ATP and Mg2+ were at a minimum. Arginine transport exhibited Michaelis-Menten kinetics when the arginine concentration was varied (Km = 0.4 mM). In contrast, arginine transport did not follow Michaelis-Menten kinetics when the MgATP2-concentration was varied (S0.5 = 0.12 mM). There was no inhibition of arginine transport when glutamine, ornithine, or lysine were included in the assay mixture. In contrast, arginine transport was inhibited 43% when D-arginine was present at a concentration 16-fold higher than that of L-arginine. Measurements of the internal vesicle volume established that arginine is concentrated 14-fold relative to the external concentration. Arginine transport was inhibited by dicyclohexylcarbodiimide, carbonyl cyanide m-chlorophenyl-hydrazone, and potassium nitrate (an inhibitor of vacuolar ATPase activity). Inhibitors of the plasma membrane or mitochondrial ATPase such as sodium vanadate or sodium azide did not affect arginine transport activity. In addition, arginine transport had a nucleoside triphosphate specificity similar to that of the vacuolar ATPase. These results suggest that arginine transport is dependent on vacuolar ATPase activity and an intact proton channel and proton gradient.

• Publication year

  1986

• Venue

  Journal of Biological Chemistry

• Publication date

  1986-07-05

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1016/S0021-9258(19)84463-0PMID 2941421
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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