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. 1991 Mar;95(3):707–710. doi: 10.1104/pp.95.3.707

N-Cyclo-N′-(4-Dimethylamino-α-Naphthyl)Carbodiimide Inhibits Membrane-Bound and Partially Purified Tonoplast ATPase from Maize Roots

David Brauer 1, Shu-I Tu 1
PMCID: PMC1077595  PMID: 16668043

Abstract

Certain carboxylic acid groups within the primary structure of proton translocating proteins are thought to be involved in the proton pathway. In this report, the effects of a lipophilic carboxylic acid reactive reagent, N-cyclo-N′(4-dimethylamino-α-naphthyl)carbodiimide (NCD-4), on the two types of proton pumps in maize (Zea mays L.) root microsomes were investigated. NCD-4 was found to inhibit the vacuolar-type H+-ATPase in microsomal preparations; however, the plasma membrane-type H+-ATPase was unaffected. The H+-ATPase in highly purified tonoplast vesicles was also inhibited by NCD-4. Inhibition was dependent on the concentration and length of exposure to the reagent. However, there was little, if any, increase in the fluorescence of treated vesicles, indicating few carboxylic acid residues were reacting. Inhibition of the tonoplast H+-ATPase by NCD-4 was examined further with a partially purified preparation. The partially purified H+-ATPase also showed sensitivity to the NCD-4, supporting the hypothesis that this carboxylic acid reagent is an inhibitor of the tonoplast ATPase from maize roots.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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