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Plant and Cell Physiology Advance Access originally published online on January 19, 2005
Plant and Cell Physiology 2005 46(1):245-249; doi:10.1093/pcp/pci019
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© 2005 Oxford University Press

Short Communication

A Novel Vesicle Derived Directly from Endoplasmic Reticulum is Involved in the Transport of Vacuolar Storage Proteins in Rice Endosperm

Hideyuki Takahashi1, Yuhi Saito1, Tomoya Kitagawa1, Shigeto Morita1,2, Takehiro Masumura1,2,3 and Kunisuke Tanaka1,2

1 Laboratory of Genetic Engineering, Graduate School of Agriculture, Kyoto Prefectural University, Shimogamo, Kyoto, 606-8522 Japan
2 Kyoto Prefectural Institute of Agricultural Biotechnology, Seika, Kyoto, 619-0244 Japan

We found novel vesicles derived from rough endoplasmic reticulum (ER) in rice endosperm. The novel vesicles had characteristic structures different from that of the ER-derived protein body type I and the Golgi-derived dense vesicles. Immunocytochemical analysis revealed that the novel vesicles are derived directly from the aggregates of vacuolar storage proteins in the rough ER. In addition, BiP, an ER-resident molecular chaperone, was localized in the novel vesicles, but also in protein storage vacuoles (PSVs). These results suggest that the novel vesicles mediate transport of vacuolar storage proteins directly from the ER to PSVs in rice endosperm.

3 Corresponding author: E-mail, masumura{at}kpu.ac.jp; Fax, +81-75-703-5675.

(Received June 26, 2004; Accepted November 9, 2004)


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