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The formation, vacuolar localization, and tonoplast transport of salicylic acid glucose conjugates in tobacco cell suspension cultures

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Abstract

The metabolism of salicylic acid (SA) in tobacco (Nicotiana tabacum L. cv. KY 14) cell suspension cultures was examined by adding [7−14C]SA to the cell cultures for 24 h and identifying the metabolites through high performance liquid chromatography analysis. The three major metabolites of SA were SA 2-O-β-D-glucose (SAG), methylsalicylate 2-O-β-D-glucose (MeSAG) and methylsalicylate. Studies on the intracellular localization of the metabolites revealed that all of the SAG associated with tobacco protoplasts was localized in the vacuole. However, the majority of the MeSAG was located outside the vacuole. The tobacco cells contained an SA inducible SA glucosyltransferase (SAGT) enzyme that formed SAG. The SAGT enzyme was not associated with the vacuole and appeared to be a cytoplasmic enzyme. The vacuolar transport of SAG was characterized by measuring the uptake of [14C]SAG into tonoplast vesicles isolated from tobacco cell cultures. SAG uptake was stimulated eightfold by the addition of MgATP. The ATP-dependent uptake of SAG was inhibited by bafilomycin A1 (a specific inhibitor of the vacuolar H+-ATPase) and dissipation of the transtonoplast H+-electrochemical gradient. Vanadate was not an inhibitor of SAG uptake. Several β-glucose conjugates were strong inhibitors of SAG uptake, whereas glutathione and glucuronide conjugates were only marginally inhibitory. The SAG uptake exhibited Michaelis–Menten type saturation kinetics with a Km and Vmax value of 11 μM and 205 pmol min−1 mg−1, respectively, for SAG. Based on the transport characteristics it appears as if the vacuolar uptake of SAG in tobacco cells occurs through an H+-antiport-type mechanism.

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Abbreviations

ABC transporter:

ATP-binding cassette transport protein

DNP-GS:

S-(2,4-Dinitrophenyl)glutathione

E217G:

β Estradiol 17-(β-D-glucuronide)

H+-ATPase:

H+-Translocating adenosine triphosphatase

H+-PPase:

H+-Translocating pyrophosphatase

MeSA:

Methyl salicylate

MeSAG:

Methyl salicylate 2-O-β-D-glucoside

o-NPG:

o-Nitrophenyl β-D-glucoside

p-NPαG:

p-Nitrophenyl α-D-glucoside

p-NPG:

p-Nitrophenyl β-D-glucoside

SA:

Salicylic acid

SAG:

Salicylic acid 2-O-β-D-glucoside

SAGT:

Salicylic acid glucosyltransferase

SGE:

Salicylic acid glucose ester

TMV:

Tobacco mosaic virus

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Acknowledgements

The tobacco and soybean cell cultures were kindly provided by Dr. Joe Chappell at the University of Kentucky and Dr. Jack Widholm at the University of Illinois (Champaign-Urbana), respectively. This work was supported by an NSF award (Number IBN-0114131) to JVD.

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  1. Department of Biological Sciences, DePaul University, 2325 N. Clifton Ave, Chicago, IL 60614, USA

    John V. Dean, Leila A. Mohammed & Terry Fitzpatrick

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  1. John V. Dean
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  2. Leila A. Mohammed
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  3. Terry Fitzpatrick
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Correspondence to John V. Dean.

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Dean, J.V., Mohammed, L.A. & Fitzpatrick, T. The formation, vacuolar localization, and tonoplast transport of salicylic acid glucose conjugates in tobacco cell suspension cultures. Planta 221, 287–296 (2005). https://doi.org/10.1007/s00425-004-1430-3

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