Stable Isotope-Labeled Raman Imaging Reveals Dynamic Proteome Localization to Lipid Droplets in Single Fission Yeast Cells  Hemanth Nag Noothalapati Venkata,

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Stable Isotope-Labeled Raman Imaging Reveals Dynamic Proteome Localization to Lipid Droplets in Single Fission Yeast Cells  Hemanth Nag Noothalapati Venkata, Shinsuke Shigeto  Chemistry & Biology  Volume 19, Issue 11, Pages 1373-1380 (November 2012) DOI: 10.1016/j.chembiol.2012.08.020 Copyright © 2012 Elsevier Ltd Terms and Conditions

Chemistry & Biology 2012 19, 1373-1380DOI: (10. 1016/j. chembiol. 2012 Copyright © 2012 Elsevier Ltd Terms and Conditions

Figure 1 Space-Resolved Raman Measurements on Randomly Selected S. pombe Cells at Different 13C Incubation Times (A and B) Average of 25 Raman spectra measured in the cytoplasm (A) and in lipid droplets (B), at 0, 3.5, 8, 15, 23, 31, and 40 hr after inoculation in 13C-EMM. (C and D) Pearson correlation coefficients calculated for the whole region (300–1800 cm−1) of the protein-rich (C) and lipid-rich (D) Raman spectra at each 13C incubation time. Data represent mean values ± standard deviations; n = 25. Chemistry & Biology 2012 19, 1373-1380DOI: (10.1016/j.chembiol.2012.08.020) Copyright © 2012 Elsevier Ltd Terms and Conditions

Figure 2 13C Incorporation Dynamics Observed in the Bulk Experiments (A) Amide I bands in the cytoplasmic spectrum at 1654 cm−1 (open circle) and 1620 cm−1 (closed circle). The amide I mode is predominantly assigned to the C = O stretch of the peptide bond of proteins. Upon 13C substitution, the amide I vibrational frequency shifts from 1654 to 1620 cm−1. (B) Phenylalanine ring-breathing mode in the cytoplasmic spectrum at 1003 cm−1 (open circle) and 967 cm−1 (closed circle). Upon 13C substitution, the Phe breathing frequency shifts from 1003 to 967 cm−1. (C) 12C = 12C stretch band at 1654 cm−1 (open circle) and the 13C-shifted 1602 cm−1 band (closed circle) in the lipid droplet spectrum. Data represent mean values ± standard deviations; n = 25. Chemistry & Biology 2012 19, 1373-1380DOI: (10.1016/j.chembiol.2012.08.020) Copyright © 2012 Elsevier Ltd Terms and Conditions

Figure 3 Time-Lapse Multimode Raman Imaging of a Single Living S. pombe Cell Grown in 13C-Glucose-Containing Medium (A) Bright-field optical images of the target cell. Arrows at 31 hr indicate the regions where there are many lipid droplets. Lipid droplets are identified as black dots. (B) GFP fluorescence images of mitochondria of the cell. (C–F) Raman images constructed at 1003 (Phe breathing mode of 12C-proteins), 967 (Phe breathing mode of 13C-substituted proteins), 1301 (in-plane CH2 twist of lipids), and 1602 cm−1. The scale bar in (D) measures 5 μm and also applies to the other images. (G) Correlation images between D and E. The correlation coefficient at each pixel was computed using the equation given in the text. Chemistry & Biology 2012 19, 1373-1380DOI: (10.1016/j.chembiol.2012.08.020) Copyright © 2012 Elsevier Ltd Terms and Conditions

Figure 4 Time-Lapse Raman Imaging of Other Single Living S. pombe Cells Grown in 13C-Glucose-Containing Medium (A) The same GFP-labeled strain as in Figure 3. From left to right, the optical image, GFP image, Raman images at 967 and 1301 cm−1, and their correlation image are shown. Arrows indicate the regions where many lipid droplets are found. (B) A different wild-type strain (PR110) taken from early-log phase. (C) Yet another wild-type strain (BCRC21605) taken from mid-log phase. The scale bar measures 5 μm and also applies to the other images. Chemistry & Biology 2012 19, 1373-1380DOI: (10.1016/j.chembiol.2012.08.020) Copyright © 2012 Elsevier Ltd Terms and Conditions