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Vol. 15, Issue 7, 3233-3243, July 2004
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*Max F. Perutz Laboratories, University Departments at the Vienna Biocenter, Institute of Medical Biochemistry, 1030 Vienna, Austria
Submitted January 21, 2004;
Accepted April 29, 2004
Monitoring Editor: Daphne Preuss
Although early studies suggested that little compartmentalization exists within the nucleus, more recent studies on metazoan systems have identified a still increasing number of specific subnuclear compartments. Some of these compartments are dynamic structures; indeed, protein and RNA-protein components can cycle between different domains. This is particularly evident for RNA processing components. In plants, lack of tools has hampered studies on nuclear compartmentalization and dynamics of RNA processing components. Here, we show that transient expression of fluorescent protein fusions of U1 and U2 small nuclear ribonucleoprotein particle (snRNP)-specific proteins U1-70K, U2B'', and U2A ', nucleolar proteins Nop10 and PRH75, and serine-arginine-rich proteins in plant protoplasts results in their correct localization. Furthermore, snRNP-specific proteins also were correctly assembled into mature snRNPs. This system allowed a systematic analysis of the cellular localization of Arabidopsis serine-arginine-rich proteins, which, like their animal counterparts, localize to speckles but not to nucleoli and Cajal bodies. Finally, markers for three different nuclear compartments, namely, nucleoli, Cajal bodies, and speckles, have been established and were shown to be applicable for colocalization studies in living plant protoplasts. Thus, transient expression of proteins tagged with four different fluorescent proteins is a suitable system for studying the nuclear organization of spliceosomal proteins in living plant cells and should therefore allow studies of their dynamics as well.
Abbreviations used: CFP, cyan fluorescent protein; FP, fluorescent protein; GFP, green fluorescent protein; mRFP, monomeric red fluorescent protein; RFP, red fluorescent protein; snRNP, small nuclear ribonucleoprotein; SR, serine-arginine; YFP, yellow fluorescent protein.
Online version of this article contains supporting material. Online version is available at www.molbiolcell.org.
* Corresponding author. E-mail address: zdravko.lorkovic{at}univie.ac.at.
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