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First published online April 29, 2005; 10.1105/tpc.105.031930

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The Plant Cell 17:1764-1776 (2005)
© 2005 American Society of Plant Biologists

KATAMARI1/MURUS3 Is a Novel Golgi Membrane Protein That Is Required for Endomembrane Organization in Arabidopsis{boxw}

Kentaro Tamuraa, Tomoo Shimadaa, Maki Kondob, Mikio Nishimurab and Ikuko Hara-Nishimuraa,1

a Department of Botany, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
b Department of Cell Biology, National Institute for Basic Biology, Okazaki 444-8585, Japan

1 To whom correspondence should be addressed. E-mail ihnishi{at}gr.bot.kyoto-u.ac.jp; fax 81-75-753-4142.

In plant cells, unlike animal and yeast cells, endomembrane dynamics appear to depend more on actin filaments than on microtubules. However, the molecular mechanisms of endomembrane–actin filament interactions are unknown. In this study, we isolated and characterized an Arabidopsis thaliana mutant, katamari1 (kam1), which has a defect in the organization of endomembranes and actin filaments. The kam1 plants form abnormally large aggregates that consist of endoplasmic reticulum with actin filaments in the perinuclear region within the cells and are defective in normal cell elongation. Map-based cloning revealed that the KAM1 gene is allelic to the MUR3 gene. We demonstrate that the KAM1/MUR3 protein is a type II membrane protein composed of a short cytosolic N-terminal domain and a transmembrane domain followed by a large lumenal domain and is localized specifically on Golgi membranes. We further show that actin filaments interact with Golgi stacks via KAM1/MUR3 to maintain the proper organization of endomembranes. Our results provide functional evidence that KAM1/MUR3 is a novel component of the Golgi-mediated organization of actin functioning in proper endomembrane organization and cell elongation.




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