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Abstract Detail


Membrane Transport

Li, Lixin [1], Shimada, Tomoo [2], Takahashi, Hideyuki [2], Ueda, Haruko [2], Fukao, Yoichiro [3], Kondo, Maki [4], Mikio, Nishimura [4], Hara-Nishimura, Ikuko [2].

A novel factor MAIGO2 is essential for transport of seed storage proteins from the ER in Arabidopsis thaliana.

Seed storage proteins are synthesized on the endoplasmic reticulum (ER) as precursors and then are transported to protein storage vacuoles, where they are processed into mature forms. We isolated an Arabidopsis mutant (maigo2) that accumulated precursors of two major storage proteins, 2S albumin and 12S globulin, in dry seeds (1). mag2 seed cells contained many novel structures with an electron-dense core composed of the precursors of 2S albumin. 12S globulins were localized in the matrix region of the structures together with ER chaperones, BiP and PDI, which were more abundant in mag2 seeds. MAG2 protein had a RINT-1/TIP20 domain in the C-terminal region. Some MAG2 molecules were peripherally associated with the ER membrane. MAG2 had an ability to bind to two ER-localized t-SNAREs (At Sec20 and At Ufe1). Our findings suggest that MAG2 functions in the transport of storage protein precursors between the ER and the Golgi complex in plants. (1) Li et al., Plant Cell. 2006 Dec;18(12):3535-47.


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1 - Kyoto Univ., Graduate School of Science, Oiwake-cho, Kitashirakawa, Sakyo-ku, Graduate School of Science, Kyoto University, Kyoto, Kyoto, 606-8502, Japan
2 - Kyoto Univ., Graduate School of Science
3 - Nara Institute of Science and Technology, Graduate School of Biological Sciences
4 - National Institute for Basic Biology, Department of Cell Biology

Keywords:
vesicular-transport.

Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P10006
Abstract ID:810


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