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Plant and Cell Physiology Advance Access published online on May 3, 2007
Plant and Cell Physiology, doi:10.1093/pcp/pcm052
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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 e-mail: journals.permissions@oxfordjournals.org

Multiple Intracellular locations of Lon Protease in Arabidopsis : Evidence for the Localization of AtLon4 to Chloroplasts.

Oren Ostersetzer1,*, Yusuke Kato2, Zach Adam3 and Wataru Sakamoto2

1 Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
2 Research Institute for Bioresources, Okayama University, Kurashiki, Okayama 710-0046, Japan
3 The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, Israel

*Corresponding author: Oren Ostersetzer. Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel. Tel: +972-3-968-3397, FAX: +972-3-966-9583, E-mail: biranos{at}volcani.agri.gov.il


  Abstract

Arabidopsis contains four Lon protease-like proteins (AtLon1 to AtLon4), predicted to different cellular organelles; these including to mitochondria, peroxisomes and plastids. A notable question is the presence of Lon in chloroplasts, since it is absent from cyanobacteria and thus appears to have been lost during the evolution of photosynthetic organisms. Based on in vivo transient assays, we found that AtLon4 is dually targeted to both mitochondria and chloroplasts. Furthermore, immunoblot analysis localized AtLon4 to the thylakoids. Thus, in spite of its absence from basal photosynthetic organisms, our results suggest the presence of Lon in plants plastids.

Keywords: AAA family - ATP-dependent protease - Chloroplasts - Lon - Mitochondria - Peroxisomes


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