Journal Article

The Correlation between Expression and Localization of a Foreign Gene Product in Rice Endosperm

Hiroshi Yasuda, Yuji Hayashi, Takahito Jomori and Fumio Takaiwa

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 47, issue 6, pages 756-763
Published in print June 2006 | ISSN: 0032-0781
Published online June 2006 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcj049
The Correlation between Expression and Localization of a Foreign Gene Product in Rice Endosperm

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  • Biochemistry
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Glucagon-like peptide 1 (GLP-1) is a 30 amino acid peptide hormone involved in insulin stimulation that is dependent upon blood glucose levels. We have previously reported that when this short peptide gene was directly expressed under the control of a glutelin promoter and its signal peptide, it was not accumulated in transgenic rice seed due to gene silencing. However, when the modified GLP-1 (mGLP-1) gene was enlarged to 5×mGLP-1 (mGLP×5) by tandem repeat, no silencing was observed. The mGLP×5 peptide could be accumulated in rice seed and its localization was mainly limited to the endoplasmic reticulum (ER). We also investigated alternative cellular localization sites that would increase accumulation. The relationship between the expression level and localization was examined by attaching the chitinase signal peptide to mGLP×5 to direct it into the intercellular space (apoplast), or by expression as a fusion protein with glutelin by insertion into a variable region of the acidic subunit, thus directing the peptide to protein body II (PB II). Attachment of the KDEL ER retention signal to the 6×mGLP-1 (mGLP×6) or its fusion to the C-terminus of the 13 kDa prolamin directed the peptide to the ER or PB I, respectively. Unexpectedly, these results indicated that mGLP×5 without any signal except for the glutelin signal peptide was accumulated to the greatest extent in rice endosperm. It can thus be concluded that the ER is a suitable intracellular organelle for accumulation of mGLP×5 peptide.

Keywords: Endosperm; GLP-1; Rice; Subaleurone cell; Transgenic plant; BSA, bovine serum albumin; DAF, days after flowering; ER, endoplasmic reticulum; GFP, green fluorescent protein; GLP-1, glucagon-like protein 1; PB, protein body; PBS, phosphate-buffered saline

Journal Article.  5789 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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