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Heterologous signals allow efficient targeting of a nuclear-encoded fusion protein to plastids and endoplasmic reticulum in diverse plant species

Gnanasambandam, A. and Polkinghorne, I.G. and Birch, R.G. (2007) Heterologous signals allow efficient targeting of a nuclear-encoded fusion protein to plastids and endoplasmic reticulum in diverse plant species. Plant Biotechnology Journal, 5 (2). pp. 290-296.

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Article Link(s): http://dx.doi.org/10.1111/j.1467-7652.2007.00241.x

Publisher URL: http://www3.interscience.wiley.com/cgi-bin/home

Abstract

Approximately 30% of plant nuclear genes appear to encode proteins targeted to the plastids or endoplasmic reticulum (ER). The signals that direct proteins into these compartments are diverse in sequence, but, on the basis of a limited number of tests in heterologous systems, they appear to be functionally conserved across species. To further test the generality of this conclusion, we tested the ability of two plastid transit peptides and an ER signal peptide to target green fluorescent protein (GFP) in 12 crops, including three monocots (barley, sugarcane, wheat) and nine dicots (Arabidopsis, broccoli, cabbage, carrot, cauliflower, lettuce, radish, tobacco, turnip). In all species, transient assays following microprojectile bombardment or vacuum infiltration using Agrobacterium showed that the plastid transit peptides from tomato DCL (defective chloroplast and leaves) and tobacco RbcS [ribulose bisphosphate carboxylase (Rubisco) small subunit] genes were effective in targeting GFP to the leaf plastids. GFP engineered as a fusion to the N-terminal ER signal peptide from Arabidopsis basic chitinase and a C-terminal HDEL signal for protein retention in the ER was accumulated in the ER of all species. The results in tobacco were confirmed in stably transformed cells. These signal sequences should be useful to direct proteins to the plastid stroma or ER lumen in diverse plant species of biotechnological interest for the accumulation of particular recombinant proteins or for the modification of particular metabolic streams.

Item Type:Article
Additional Information:© Blackwell Publishing Ltd.
Keywords:Endoplasmic reticulum retention signal; endoplasmic reticulum signal peptide; green fluorescent protein; plastid targeting; stromules; transit peptide.
Subjects:Science > Botany > Plant physiology
Deposited On:21 Jan 2009 23:40
Last Modified:09 Feb 2009 05:23

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