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Science 9 April 1999:
Vol. 284. no. 5412, pp. 328 - 330
DOI: 10.1126/science.284.5412.328
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Reports

The Pex16p Homolog SSE1 and Storage Organelle Formation in Arabidopsis Seeds

Yun Lin, 1 Lin Sun, 1* Long V. Nguyen, 1dagger Richard A. Rachubinski, 2 Howard M. Goodman 1

Mature Arabidopsis seeds are enriched in storage proteins and lipids, but lack starch. In the shrunken seed 1 (sse1) mutant, however, starch is favored over proteins and lipids as the major storage compound. SSE1 has 26 percent identity with Pex16p in Yarrowia lipolytica and complements pex16 mutants defective in the formation of peroxisomes and the transportation of plasma membrane- and cell wall-associated proteins. In Arabidopsis maturing seeds, SSE1 is required for protein and oil body biogenesis, both of which are endoplasmic reticulum-dependent. Starch accumulation in sse1 suggests that starch formation is a default storage deposition pathway.

1 Department of Genetics, Harvard Medical School, Boston, MA 02115, USA, and Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114, USA.
2 Department of Cell Biology and Anatomy, University of Alberta, Edmonton, Alberta T6G 2H7, Canada.
*   Present address: Phylos, Lexington, MA 02138, USA.

dagger    Present address: Biosources Technologies, Vacaville, CA 95688, USA.

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Peroxisomal Peripheral Membrane Protein YlInp1p Is Required for Peroxisome Inheritance and Influences the Dimorphic Transition in the Yeast Yarrowia lipolytica.
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Eukaryot. Cell 6, 1528-1537
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Functional Classification of Arabidopsis Peroxisome Biogenesis Factors Proposed from Analyses of Knockdown Mutants.
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The PEROXIN11 Protein Family Controls Peroxisome Proliferation in Arabidopsis.
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S. K. Karnik and R. N. Trelease (2005)
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Functional Differentiation of Peroxisomes Revealed by Expression Profiles of Peroxisomal Genes in Arabidopsis thaliana.
T. Kamada, K. Nito, H. Hayashi, S. Mano, M. Hayashi, and M. Nishimura (2003)
Plant Cell Physiol. 44, 1275-1289
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O. I. Petriv, D. B. Pilgrim, R. A. Rachubinski, and V. I. Titorenko (2002)
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