JXB Advance Access published online on March 30, 2006
Journal of Experimental Botany, doi:10.1093/jxb/erj157
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1 Proteome Factory AG, Dorotheenstr. 94, D-10117 Berlin, Germany
* To whom correspondence should be addressed. The plant system is a highly dynamic structure on all molecular levels, transcripts, proteins, and metabolites. Thus, protein analysis has to cope with a highly dynamic range of concentrations. A severe problem is the detection of low-abundance proteins in the presence of housekeeping proteins. Basically three approaches are facilitated to measure protein abundance in a comprehensive manner: 2DE and one- or multi-dimensional shotgun proteomics, with or without stable-isotope labelling. These comparative techniques allow for the identification of altered protein levels compared with a reference state. However, they are limited to the analysis of medium/high-abundance proteins. Using stable-isotope dilution techniques it is possible to target the quantitative analysis to low-abundance proteins and to measure absolute concentrations of proteins. Based on multi-dimensional non-gel shotgun proteomics in Arabidopis thaliana, a list of tryptic peptides comprising >1000 proteins was generated. A strategy for quantitative plant proteomics is proposed using this master-list for selecting signature peptides of proteins. To prove the concept, a liquid chromatography-high-resolution triple quadrupole multiple reaction monitoring-mass spectrometry technique is described to determine the absolute amount of a low-abundance sucrose synthase isoform out of an ultra-complex A. thaliana protein extract.
Received April 10, 2005
Accepted February 8, 2006
Plant Proteomics Special Issue Article
Relative and absolute quantitative shotgun proteomics: targeting low-abundance proteins in Arabidobsis thaliana
Stefanie Wienkoop 1
and
Wolfram Weckwerth 2 *
2 Max-Planck-Institute of Molecular Plant Physiology, D-14476 Potsdam-Golm, Germany
Wolfram Weckwerth, E-mail: weckwerth{at}mpimp-golm-mpg.de
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