Sucrose Synthase, a Cytosolic Enzyme in Protoplasts of Jerusalem Artichoke Tubers (Helianthus tuberosus L.) | Zendy

Felix Keller | Zendy; Marco Frehner | Zendy; Andres Wiemken | Zendy

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Sucrose Synthase, a Cytosolic Enzyme in Protoplasts of Jerusalem Artichoke Tubers (Helianthus tuberosus L.)

Author(s) -

Felix Keller,

Marco Frehner,

Andres Wiemken

Publication year - 1988

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.88.2.239

Subject(s) - jerusalem artichoke , helianthus , sucrose synthase , sucrose , protoplast , atp synthase , biology , botany , enzyme , invertase , cytosol , sucrose phosphate synthase , horticulture , biochemistry , sunflower

The exact subcellular location of sucrose synthase (UDP-d-glucose: d-fructose 2-alpha-d-glucosyltransferase, EC 2.4.1.13) in Helianthus tuberosus tubers was studied by comparison of its activity in protoplasts with that of vacuoles isolated from them. Assuming 100% of the beta-N-acetylglucosaminidase activity to be of vacuolar origin, less than 5% of both the sucrose synthase activity and the extravacuolar marker NAD-malate dehydrogenase was detected in the vacuole preparations. Sucrose synthase is therefore an extravacuolar enzyme. Its role in the inulin metabolism of H. tuberosus is discussed.

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