Lange S, et al. (2008) Simultaneous transport of different localized mRNA species revealed by live-cell imaging. Traffic 9(8):1256-67
Abstract: Intracellular mRNA localization is a common mechanism to achieve asymmetric distributions of proteins. Previous studies have revealed that, in a number of cell types, different mRNA species are localized by the same transport machinery. However, it has been unclear if these individual mRNA species are specifically sorted into separate or common ribonucleoprotein particles before or during transport. Using budding yeast as a model system, we analyzed the intracellular movement of individual pairs of localized mRNA in live cells. Yeast cells localize more than 20 different mRNAs to the bud with the help of the Myo4p/She3p/She2p protein complex. For live-cell imaging, mRNA pairs were tagged with tandem repeats of either bacteriophage MS2 or lambda boxB RNA sequences and fluorescently labeled by fusion protein constructs that bind to the RNA tag sequences. Using 3D single-particle tracking with dual-color detection, we have tracked the transport of two different localized mRNA species in real time. Our observations demonstrate that different localized mRNAs are co-assembled into common ribonucleoprotein particles and co-transported in a directional manner to the target site. Non-localized mRNAs or mutant mRNAs that lack functional localization signals form separate particles that are not transported to the bud. This study reveals a high degree of coordination of mRNA trafficking in budding yeast.
|Status: Published||Type: Journal Article||PubMed ID: 18485054|
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