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Plant and Cell Physiology Advance Access published online on February 27, 2007
Plant and Cell Physiology, doi:10.1093/pcp/pcm031
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© The Author 2007. Published by Oxford University Press on behalf of the Japanese Society of Plant Physiologists. All rights reserved.

Uncovering a link between a plastid translocon component and rhomboid proteases using yeast mitochondria-based assays

Katherine Karakasis, Darcie Taylor and Kenton Ko

Department of Biology, Queen’s University, Kingston, Ontario, Canada K7L 3N6

Corresponding author: Kenton Ko, Department of Biology, Queen’s University, Kingston, Ontario, Canada K7L 3N6, Tel: 1-613-533-6155, Fax: 1-613-533-6617, kok{at}biology.queensu.ca


  Abstract

Rhomboid proteases are present in bacteria, insects, yeasts, parasites, mammals, and plants. These proteases are part of the regulated intramembrane proteolysis mechanism for controlling processes such as development, stress response, lipid metabolism, and mitochondrial membrane remodeling. Specific rhomboid protease substrates linked to these processes have been identified from insects to mammals, but not for plants. Identification of a link is a key step for elucidating each rhomboid protease’s role. Here, using a yeast mitochondria-based approach, we report evidence of a potential link between a plastid translocon component and organellar rhomboid proteases. This identification expands the types of processes involving RIP to potentially include at least one aspect of plastid protein transport.

Keywords: Plastid translocon - Rhomboid proteases - Yeast mitochondria- Mutants - Arabidopsis


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