Abstract
A group of nuclear transcription factors, the Whirly proteins, were recently shown to be targeted also to chloroplasts and mitochondria. In order to find out whether other proteins might share this feature, an in silico-based screening of transcription factors from Arabidopsis and rice was carried out with the aim of identifying putative N-terminal chloroplast and mitochondrial targeting sequences. For this, the individual predictions of several independent programs were combined to a consensus prediction using a naïve Bayes method. This consensus prediction shows a higher specificity at a given sensitivity value than each of the single programs. In both species, transcription factors from a variety of protein families that possess putative N-terminal plastid or mitochondrial target peptides as well as nuclear localization sequences, were found. A search for homologues within members of the AP2/EREBP protein family revealed that target peptide-containing proteins are conserved among monocotyledonous and dicotyledonous species. Fusion of one of these proteins to GFP revealed, indeed, a dual targeting activity of this protein. We propose that dually targeted transcription factors might be involved in the communication between the nucleus and the organelles in plant cells. We further discuss how recent results on the physical interaction between the organelles and the nucleus could have significance for the regulation of the localization of these proteins.
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Abbreviations
- At:
-
Arabidopsis thaliana
- cTP:
-
Chloroplast targeting peptide
- GFP:
-
Green fluorescent protein
- mTP:
-
Mitochondrial targeting peptide
- NLS:
-
Nuclear localization sequence
- Os:
-
Oryza sativa
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Acknowledgments
The authors gratefully acknowledge Dr. Mario Brosch and Isabell Kilbienski (University of Kiel) for stimulating discussions. Prof. Martin Huelskamp (University of Cologne) is thanked for providing the Arabidopsis cell culture.
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Communicated by B. F. Lang.
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438_2007_214_MOESM1_ESM.xls
S1: List of plastid proteins used as test set for chloroplast localization. The gene identifier, organism and function of each protein are given. (64 KB)
438_2007_214_MOESM2_ESM.xls
S2: List of mitochondrial proteins used as test set for mitochondrial localization. The gene identifier, organism and function of each protein are given. (35 KB)
438_2007_214_MOESM3_ESM.xls
S3: List of non-plastid and non-mitochondrial proteins used as control test set for non-organellar localization. The gene identifier, organism and function of each protein are given. (93 KB)
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Schwacke, R., Fischer, K., Ketelsen, B. et al. Comparative survey of plastid and mitochondrial targeting properties of transcription factors in Arabidopsis and rice. Mol Genet Genomics 277, 631–646 (2007). https://doi.org/10.1007/s00438-007-0214-4
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DOI: https://doi.org/10.1007/s00438-007-0214-4