Plant Physiology Preview
Published on February 25, 2005; 10.1104/pp.104.053637
Received September 16, 2004
Returned for revision November 16, 2004
Accepted November 23, 2004
Proteomic Characterization of Evolutionarily Conserved and Variable Proteins of Arabidopsis Cytosolic Ribosomes
Ing-Feng Chang , Kathleen Szick-Miranda , Songqin Pan , and Julia Bailey-Serres *
Center for Plant Cell Biology, Department of Botany and Plant Sciences, University of California, Riverside, California 92521-0124
Department of Biology, California State University, Bakersfield, California 93311
* Corresponding author; email: serres{at}ucr.edu.
Analysis of 80S ribosomes of Arabidopsis (Arabidopsis thaliana) by use of high-speed centrifugation, sucrose gradient fractionation, one- and two-dimensional gel electrophoresis, liquid chromatography purification, and mass spectrometry (matrix-assisted laser desorption/ionization time-of-flight and electrospray ionization) identified 74 ribosomal proteins (r-proteins), of which 73 are orthologs of rat r-proteins and one is the plant-specific r-protein P3. Thirty small (40S) subunit and 44 large (60S) subunit r-proteins were confirmed. In addition, an ortholog of the mammalian receptor for activated protein kinase C, a tryptophan-aspartic acid-domain repeat protein, was found to be associated with the 40S subunit and polysomes. Based on the prediction that each r-protein is present in a single copy, the mass of the Arabidopsis 80S ribosome was estimated as 3.2 MD (1,159 kD 40S; 2,010 kD 60S), with the 4 single-copy rRNAs (18S, 26S, 5.8S, and 5S) contributing 53% of the mass. Despite strong evolutionary conservation in r-protein composition among eukaryotes, Arabidopsis 80S ribosomes are variable in composition due to distinctions in mass or charge of approximately 25% of the r-proteins. This is a consequence of amino acid sequence divergence within r-protein gene families and posttranslational modification of individual r-proteins (e.g. amino-terminal acetylation, phosphorylation). For example, distinct types of r-proteins S15a and P2 accumulate in ribosomes due to evolutionarily divergence of r-protein genes. Ribosome variation is also due to amino acid sequence divergence and differential phosphorylation of the carboxy terminus of r-protein S6. The role of ribosome heterogeneity in differential mRNA translation is discussed.
This article has been cited by other articles:
|
|
|
|
 
M. Ueda, T. Nishikawa, M. Fujimoto, H. Takanashi, S.-i. Arimura, N. Tsutsumi, and K.-i. Kadowaki
Substitution of the Gene for Chloroplast RPS16 Was Assisted by Generation of a Dual Targeting Signal
Mol. Biol. Evol.,
August 1, 2008;
25(8):
1566 - 1575.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
R. F. Degenhardt and P. C. Bonham-Smith
Arabidopsis Ribosomal Proteins RPL23aA and RPL23aB Are Differentially Targeted to the Nucleolus and Are Disparately Required for Normal Development
Plant Physiology,
May 1, 2008;
147(1):
128 - 142.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
A. J. Carroll, J. L. Heazlewood, J. Ito, and A. H. Millar
Analysis of the Arabidopsis Cytosolic Ribosome Proteome Provides Detailed Insights into Its Components and Their Post-translational Modification
Mol. Cell. Proteomics,
February 1, 2008;
7(2):
347 - 369.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
J.-G. Chen, H. Ullah, B. Temple, J. Liang, J. Guo, J. M. Alonso, J. R. Ecker, and A. M. Jones
RACK1 mediates multiple hormone responsiveness and developmental processes in Arabidopsis
J. Exp. Bot.,
August 1, 2006;
57(11):
2697 - 2708.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
S. Baginsky and W. Gruissem
Arabidopsis thaliana proteomics: from proteome to genome
J. Exp. Bot.,
April 1, 2006;
57(7):
1485 - 1491.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
M. E. Zanetti, I.-F. Chang, F. Gong, D. W. Galbraith, and J. Bailey-Serres
Immunopurification of Polyribosomal Complexes of Arabidopsis for Global Analysis of Gene Expression
Plant Physiology,
June 1, 2005;
138(2):
624 - 635.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
