alexa Amino-Terminus of Oleosin Protein Defines the Size of O
ISSN: 2329-9029

Journal of Plant Biochemistry & Physiology
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Research Article

Amino-Terminus of Oleosin Protein Defines the Size of Oil Bodies - Topological Model of Oleosin-Oil Body Complex

Wahlroos T1, Soukka J2, Denesyuk A3 and Susi P1,4*
1Biomaterials and Diagnostics Group, Turku University of Applied Sciences, Turku, Finland
2University of Turku, Laboratory of Biophysics, Turku, Finland
3Åbo Akademi University, Department of Biochemistry and Pharmacy, Turku, Finland
4Department of Virology, Kiinamyllynkatu, Turku, Finland
Corresponding Author : Petri Susi
Department of Virology
Kiinamyllynkatu, 13
20520 Turku, Finland
Tel: +3582513303
E-mail: pesusi@utu.fi
Received May 23, 2015; Accepted August 31, 2015; Published September 07, 2015
Citation: Wahlroos T, Soukka J, Denesyuk A, Susi P (2015) Amino-Terminus of Oleosin Protein Defines the Size of Oil Bodies - Topological Model of Oleosin-Oil Body Complex. J Plant Biochem Physiol 3:155. doi:10.4172/2329-9029.1000155
Copyright: © 2015 Wahlroos T, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

Lipids formed in seeds of oilseed plant are stored in specific cytosolic structures called oil bodies, which are covered with oleosin proteins. Disruption of oleosin layer by heat treatment makes lipids susceptible to oxidation. By analyzing the amino acid sequence of Arabidopsis oleosin, unique domains were identified within the aminoterminus of the protein. Removal of these domains affected both the size of oil bodies and their susceptibility to lipid-specific stain, Nile Blue A. Amino-terminally truncated oleosin mutant, which was in fusion to green fluorescent protein (GFP), confined to rough endoplasmic reticulum (rER) suggesting that the amino-terminus of oleosin is required for the efficient lateral transportation of oleosin proteins from rER to oil bodies. The size of oil bodies covered by amino-terminal mutants was at least 5 times larger than native oil bodies. Based on the observations, a topological model was generated, which could explain how oleosin maintains and protects the integrity of oil bodies during seed storage.

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