Fluorophore-conjugated multiple 20nt FISH probes were prepared to hybridize the ORF (Cy5) and MS2-tag (Cy3) as depicted. oligonucleotides used for plasmid construction. elife-57814-supp2.docx (47K) GUID:?6DA0B2F7-B23F-4B11-BAED-2B3298B99798 Rabbit Polyclonal to CDC25C (phospho-Ser198) Transparent reporting form. elife-57814-transrepform.docx (250K) GUID:?7739E517-E74C-4044-8E84-C7CD3CED1C7F Data Availability StatementAll data generated or analysed during this study are included in the manuscript and supporting files. The following previously published datasets were used: Couvillion MT, Soto IC, Shipkovenska G, Churchman LS. 2016. Synchronized translation programs across cellular compartments. NCBI Gene Expression Omnibus. GSE74454 Williams CC, Jan CH, Weissman JS. 2014. Targeting and Plasticity of Mitochondrial Proteins Revealed by Proximity-Specific Ribosome Profiling. NCBI Gene Expression Omnibus. GSE61011 Morgenstern M, Stiller SB, Lbbert P, Peikert CD, Dannenmaier S, Drepper F, Weill U, H?? P, Feuerstein R, Gebert M, Bohnert M, van?der?Laan YM 750 M, Schuldiner M, Schtze C, Oeljeklaus S, Pfanner N, Wiedemann N, Warscheid B. 2017. Definition of a high-confidence mitochondrial proteome at quantitative scale_pure versus crude mitochondria. ProteomeXchange. PXD006151 Abstract Mitochondria are dynamic organelles that must precisely control their protein composition according to cellular energy demand. Although nuclear-encoded mRNAs can be localized to the mitochondrial surface, the importance of this localization is unclear. As yeast switch to respiratory metabolism, there is an increase in the fraction of the cytoplasm that is mitochondrial. Our data point to this change in mitochondrial volume fraction increasing the localization of certain nuclear-encoded mRNAs to the surface of the mitochondria. We show that mitochondrial mRNA localization is necessary and sufficient to increase protein production to levels required during respiratory growth. Furthermore, we find that ribosome stalling impacts mRNA sensitivity to mitochondrial volume fraction and counterintuitively leads to enhanced protein synthesis by increasing mRNA localization to mitochondria. This points to a mechanism by which cells are able to use translation elongation and the geometric constraints of the cell to fine-tune organelle-specific gene expression through mRNA localization. contains 13 genes?(Borst and Grivell, 1978). While cells can generate ATP through YM 750 mitochondrial oxidative phosphorylation, they can also use glycolysis as an alternative means of generating ATP. are Crabtree-positive yeast and will actively repress respiration and the use of alternative carbon sources in conditions in which the fermentable carbon source glucose is present?(De Deken, 1966). This seems counterintuitive as the yield of ATP per glucose molecule is much higher in respiration compared to fermentation, but it is thought that fermentation allows higher fluxes of metabolite processing, leading to faster growth?(van Dijken et al., 1993). Yet as cells run out of glucose they must switch their primary ATP generation source from fermentation to respiration. This metabolic change is known to dramatically change the mitochondrial morphology?(Egner et al., 2002). The protein content of yeast mitochondria also shows dynamic changes in response to shifting cellular energy demands?(Morgenstern et al., 2017; Paulo et al., 2016). The HAP complex is known to play an important role in the transcriptional upregulation of mitochondrial biogenesis upon a shift to non-fermentable carbon sources?(Buschlen et al., 2003). Translational regulation has also been found to be important in the control of mitochondrial gene expression as YM 750 YM 750 oxidative phosphorylation protein coding mRNAs gradually increase their protein synthesis as the growth environment changes from fermentative growth YM 750 to respiratory conditions?(Couvillion et al., 2016). mRNA localization is a means to post-transcriptionally regulate gene expression at both a temporal and spatial level?(Martin and Ephrussi, 2009). In the 1970s, electron microscopy analysis found that cytoplasmic ribosomes can be localized along the mitochondrial outer membrane?(Kellems et al., 1974). Recent microarray and RNA-seq analyses of biochemically fractionated mitochondrial membranes and fluorescent microscopy analysis have identified subsets of nuclear-encoded mRNAs that are mitochondrially localized?(Fazal et al., 2019; Gadir.