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Activation of a mitochondrial ATPase gene induces abnormal seed development in Arabidopsis

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Authors
Baek, Kon; Seo, Pil Joon; Park, Chung-Mo
Issue Date
2011-04
Citation
Molecules and Cells, Vol.31 No.4, pp.361-369
Keywords
AAA-type ATPaseabiotic stressabscisic acidArabidopsisseed development
Abstract
The ATPases associated with various cellular activities (AAA) proteins are widespread in living organisms. Some of the AAA-type ATPases possess metalloprotease activities. Other members constitute the 26S proteasome complexes. In recent years, a few AAA members have been implicated in vesicle-mediated secretion, membrane fusion, cellular organelle biogenesis, and hypersensitive responses (HR) in plants. However, the physiological roles and biochemical activities of plant AAA proteins have not yet been defined at the molecular level, and regulatory mechanisms underlying their functions are largely unknown. In this study, we showed that overexpression of an Arabidopsis gene encoding a mitochondrial AAA protein, ATPase-in-Seed-Development (ASD), induces morphological and anatomical defects in seed maturation. The ASD gene is expressed at a high level during the seed maturation process and in mature seeds but is repressed rapidly in germinating seeds. Transgenic plants overexpressing the ASD gene are morphologically normal. However, seed formation is severely disrupted in the transgenic plants. The ASD gene is induced by abiotic stresses, such as low temperatures and high salinity, in an abscisic acid (ABA)-dependent manner. The ASD protein possesses ATPase activity and is localized into the mitochondria. Our observations suggest that ASD may play a role in seed maturation by influencing mitochondrial function under abiotic stress.
ISSN
1016-8478
URI
https://hdl.handle.net/10371/172005
DOI
https://doi.org/10.1007/s10059-011-0048-0
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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