The Protein Translocon of the Plastid Envelopes

The Toc and Tic translocon facilitate import of preproteins into chloroplasts. In the past, it was speculated that several translocon subunits act specifically for different types of precursor proteins or in different tissues. To generate a comprehensive picture of the expression and tissue-specific...

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Bibliographic Details
Published in:The Journal of biological chemistry 2004-05, Vol.279 (20), p.21401-21405
Main Authors: Aleksandar Vojta, Marcel Alavi, Thomas Becker, Friederike Hörmann, Michael Küchler, Jürgen Soll, Rowena Thomson, Enrico Schleiff
Format: Article
Language:English
Subjects:
Arabidopsis - genetics
Arabidopsis - metabolism
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
Chloroplasts - metabolism
Gene Expression Regulation, Plant
Membrane Transport Proteins - genetics
Membrane Transport Proteins - metabolism
Oligonucleotide Array Sequence Analysis
Plastids - metabolism
Protein Subunits - genetics
Protein Subunits - metabolism
Protein Transport
Transcription Factors
Transcription, Genetic
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Summary:The Toc and Tic translocon facilitate import of preproteins into chloroplasts. In the past, it was speculated that several translocon subunits act specifically for different types of precursor proteins or in different tissues. To generate a comprehensive picture of the expression and tissue-specific localization of the translocon subunits, their transcript levels were analyzed in roots and leaves. Certain Tocs and Tics were found to be tissue-specific. The protein composition of the transloci in the envelope membranes of chloroplasts was analyzed to describe the function and possible stoichiometry. In contrast to Tic subunits, several Toc subunits seem to have a high turnover.
ISSN:0021-9258
1083-351X
DOI:10.1074/jbc.M401968200