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Review
. 2004 Nov;136(3):3414-9.
doi: 10.1104/pp.104.048934.

Targeting of proteins to endoplasmic reticulum-derived compartments in plants. The importance of RNA localization

Andrew J Crofts  1 , Haruhiko Washida, Thomas W Okita, Masahiro Ogawa, Toshihiro Kumamaru, Hikaru Satoh
Affiliations
Review

Targeting of proteins to endoplasmic reticulum-derived compartments in plants. The importance of RNA localization

Andrew J Crofts et al. Plant Physiol. 2004 Nov.
No abstract available

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Figures

Figure 1.
Figure 1.
Schematic representation of RNA-dependent seed storage protein targeting in developing rice endosperm. Following transcription in the nucleus (N), prolamine and glutelin mRNAs are transported via the cytoskeleton in large transport particles to the cortical area of endosperm cells, where they segregate onto the PB-ER and C-ER, respectively. Prolamine polypeptides are translocated into the ER lumen where they form spherical intracisternal granules known as protein body type I (PB-I), while glutelin is exported via the Golgi and deposited in irregularly shaped protein storage vacuoles (PB-II). The existence of a precursor-accumulating (PAC) vesicle-dependent pathway leading from the PB-ER directly to the protein storage vacuole has been hypothesized. The approximate sizes of the protein storage compartments are indicated.
Figure 2.
Figure 2.
Possible RNA localization pathways to cortical ER subdomains. Schematic representation of the distinct targeting pathways leading from the nucleus to the cortical ER. In addition to two regulated RNA pathways for prolamine and glutelin mRNA targeting, which require specific zipcode signals, there is evidence for the existence of a default pathway leading to the cisternal ER. Also depicted are the changes in RNA localization seen in the glup mutants. Based on the analysis of glup mutants, the three RNA pathways are not independent but are interrelated. This model does not distinguish the possibility that different RNAs reside in the same RNA transport particle and then segregate to PB-ER and cisternal ER or whether the three RNA transport pathways denote transport particles containing specific RNAs.
See this image and copyright information in PMC

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