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Review
. 2004 Nov;136(3):3427-34.
doi: 10.1104/pp.104.051060.

Endoplasmic reticulum, oleosins, and oils in seeds and tapetum cells

Kai Hsieh  1 , Anthony H C Huang
Affiliations
Review

Endoplasmic reticulum, oleosins, and oils in seeds and tapetum cells

Kai Hsieh et al. Plant Physiol. 2004 Nov.
No abstract available

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Figures

Figure 1.
Figure 1.
Models of an oleosin molecule, a seed oil body, and the synthesis of an oil body on the endoplasmic reticulum. A, The three portions of an oleosin molecule (yellow), showing the N-terminal hydrophilic portion, the central hydrophobic hairpin (and residues at the turn, including the Pro knot of three Pro residues and one Ser residue), and the C-terminal hydrophilic portion. The number of residues and their ranges in the 3 portions in all 17 Arabidopsis oleosins are shown. B, An OB having oleosins (yellow) and PLs (red) enclosing the matrix TAGs (blue). All molecules are drawn approximately to scale, whereas the diameter of the OB has been reduced 24 times to magnify the surface structure. C, A budding OB being produced on the RER. The ER lumen, the two PL layers (red), the sequestered TAGs (blue) in a budding OB, a ribosome with an mRNA synthesizing an oleosin polypeptide (dark line, of an unknown configuration), and enzymes (irregular circles) for the synthesis of TAGs and PLs are shown.
Figure 2.
Figure 2.
A model of the synthesis of a tapetosome in Brassica tapetum cells. A, Formation of an oil droplet from the RER by a mechanism similar to that in Figure 1C. Each oil droplet consists of an oil matrix (blue) enclosed by layers of PL (red) and oleosins (yellow). Presence of PLs and oleosins on the oil droplet is speculative. B, Association of several oil droplets and ER cisternae. C, A maturing tapetosome containing detached ER vesicles. D, A mature tapetosome. Modified from Platt et al. (1998).
See this image and copyright information in PMC

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