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Limonene Synthase, the Enzyme Responsible for Monoterpene
Biosynthesis in Peppermint, Is Localized to Leucoplasts of Oil Gland
Secretory Cells1
Glenn Turner,
Jonathan Gershenzon2,
Erik E. Nielson,
John E. Froehlich, and
Rodney Croteau*
Institute of Biological Chemistry, and Department of Biochemistry
and Biophysics, Washington State University, Pullman, Washington
99164-6340 (G.T., J.G., R.C.); and Department of Energy Plant Research
Laboratory, Michigan State University, East Lansing, Michigan 48823 (E.E.N., J.E.F.)
Circumstantial
evidence based on ultrastructural correlation, specific labeling, and
subcellular fractionation studies indicates that at least the early
steps of monoterpene biosynthesis occur in plastids.
(4S)-Limonene synthase, which is responsible for the
first dedicated step of monoterpene biosynthesis in mint species, appears to be translated as a preprotein bearing a long plastidial transit peptide. Immunogold labeling using polyclonal antibodies raised
to the native enzyme demonstrated the specific localization of limonene
synthase to the leucoplasts of peppermint (Mentha × piperita) oil gland secretory cells during the period
of essential oil production. Labeling was shown to be absent from all
other plastid types examined, including the basal and stalk cell
plastids of the secretory phase glandular trichomes. Furthermore, in
vitro translation of the preprotein and import experiments with
isolated pea chloroplasts were consistent in demonstrating import of
the nascent protein to the plastid stroma and proteolytic processing to
the mature enzyme at this site. These experiments confirm that the
leucoplastidome of the oil gland secretory cells is the exclusive location of limonene synthase, and almost certainly the preceding steps
of monoterpene biosynthesis, in peppermint leaves. However, succeeding
steps of monoterpene metabolism in mint appear to occur outside the
leucoplasts of oil gland cells.
1
This work was supported in part by the U.S.
Department of Energy, Division of Energy Biosciences, the National
Science Foundation Cell Biology Program, the Mint Industry Research
Council, and Project 0268 from the Agricultural Research Center,
Washington State University.
2
Present address: Max-Planck-Institut für
Chemische Ökologie, D-07745 Jena, Germany.
*
Corresponding author; e-mail croteau{at}mail.wsu.edu; fax
1-509-335-7643.
Plant Physiol. (1999) 120: 879-886
Copyright Clearance Center: 0032-0889/99/120//08
© 1999 American Society of Plant Physiologists
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