ADP-Glucose Pyrophosphorylase Is Located in the Plastid in Developing Tomato Fruit

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  • Diane M. Beckles
    John Innes Centre, Colney Lane, Norwich NR4 7UH, United Kingdom (D.M.B., A.M.S.); and
  • Josephine Craig
    Zeneca Plant Sciences, Jealotts Hill Research Station, Bracknell, Berks RG42, United Kingdom (J.C.)
  • Alison M. Smith
    John Innes Centre, Colney Lane, Norwich NR4 7UH, United Kingdom (D.M.B., A.M.S.); and

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<jats:title>Abstract</jats:title> <jats:p>The subcellular location of activity and protein of ADP-glucose pyrophosphorylase (AGPase) in developing tomato (Lycopersicon esculentum) fruit was determined following a report that the enzyme might be present inside and outside the plastids in this organ. Plastids prepared from crude homogenates of columella and pericarp, the starch-accumulating tissues of developing fruit, contained 8% to 18% of the total activity of enzymes known to be confined to plastids, and 0.2% to 0.5% of the total activity of enzymes known to be confined to the cytosol. The proportion of the total activity of AGPase in the plastids was the same as that of the enzymes known to be confined to the plastid. When samples of plastid and total homogenate fractions were subjected to immunoblotting with an antiserum raised to AGPase, most or all of the protein detected was plastidial. Taken as a whole, these data provide strong evidence that AGPase is confined to the plastids in developing tomato fruit.</jats:p>

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  • Plant Physiology

    Plant Physiology 126 (1), 261-266, 2001-05-01

    Oxford University Press (OUP)

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