Abstract
The uptake of uridine-5′-diphosphate (UDP) glucose into vacuoles isolated fromSaccharum sp. cells was fully inhibited by pretreatment with 50 μMp-chloromercuribenzenesulfonic acid (PCMBS) and was not affected by N-ethylmaleimide up to a concentration of 5 mM. The addition of 10 mM UDP-glucose during the pretreatment partially protected the uptake mechanism from PCMBS inhibition, while the presence of adenosine-5′-diphosphate (ADP) glucose or of various hexose-phosphates had no protective effect. Parallel experiments on the binding of [203Hg]PCMBS to the vacuoles showed that UDP-glucose and UDP added at 10 mM concentrations caused a 40% decrease in the binding of PCMBS while ADP-glucose did not inhibit the binding. The results indicate the presence in a previously proposed group translocator of at least one site that can bind UDP-glucose. This site, which is blocked by PCMBS, interacts with the nucleotide moiety of UDP-glucose.
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Abbreviations
- ADP-glucose:
-
adenosine-5′-diphosphate glucose
- PCMB:
-
p-chloromercuribenzoic acid
- PCMBS:
-
p-chloromercuribenzenesulfonic acid
- UDP:
-
uridine-5′-diphosphate
- UDP-glucose:
-
uridine-5′-diphosphate glucose
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Delrot, S., Thom, M. & Maretzki, A. Evidence for a uridine-5′-diphosphate-glucose-protectedp-chloromercuribenzene sulfonic acid-binding site in sugarcane vacuoles. Planta 169, 64–68 (1986). https://doi.org/10.1007/BF01369776
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DOI: https://doi.org/10.1007/BF01369776