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Plant and Cell Physiology Advance Access originally published online on February 27, 2007
Plant and Cell Physiology 2007 48(4):655-661; doi:10.1093/pcp/pcm031
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Short Communication

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: E-mail, kok{at}biology.queensu.ca; Fax, +1-613-533-6617.


  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 the role of each rhomboid protease. 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 regulated intramembrane proteolysis potentially to include at least one aspect of plastid protein transport.

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

Abbreviations: AtRBL2, Arabidopsis rhomboid protease; Ccp1, yeast mitochondrial cytochrome c peroxidase; Mgm1, a yeast mitochondrial dynamin-like GTPase; Rbd1 and Rbd2, yeast mitochondrial rhomboid proteases; RIP, regulated intramembrane proteolysis; Tic40, 40 kDa component of the translocon of the inner chloroplast envelope; TMD, transmembrane domain

(Received January 9, 2007; Accepted February 21, 2007)
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