Stable Isotope Probing and Raman Spectroscopy for Monitoring Carbon Flow in a Food Chain and Revealing Metabolic Pathway
- 14 January 2013
- journal article
- research article
- Published by American Chemical Society (ACS) in Analytical Chemistry
- Vol. 85 (3), 1642-1649
- https://doi.org/10.1021/ac302910x
Abstract
Accurately measuring carbon flows is a challenge for understanding processes such as diverse intracellular metabolic pathways and predator-prey interactions. Combined with stable isotope probing (SIP), single-cell Raman spectroscopy was demonstrated for the first time to link the food chain from carbon substrate to bacterial prey up to predators at the single-cell level in a quantitative and nondestructive manner. Escherichia coli OP50 with different 13C content, which were grown in a mixture of 12C- and fully carbon-labeled 13C-glucose (99%) as a sole carbon source, were fed to the nematode. The 13C signal in Caenorhabditis elegans was proportional to the 13C content in E. coli. Two Raman spectral biomarkers (Raman bands for phenylalanine at 1001 cm–1 and thymine at 747 cm–1 Raman bands), were used to quantify the 13C content in E. coli and C. elegans over a range of 1.1–99%. The phenylalanine Raman band was a suitable biomarker for prokaryotic cells and thymine Raman band for eukaryotic cells. A biochemical mechanism accounting for the Raman red shifts of phenylalanine and thymine in response to 13C-labeling is proposed in this study and is supported by quantum chemical calculation. This study offers new insights of carbon flow via the food chain and provides a research tool for microbial ecology and investigation of biochemical pathways.Keywords
This publication has 26 references indexed in Scilit:
- Single cell Raman spectroscopy for cell sorting and imagingCurrent Opinion in Biotechnology, 2012
- Rapid resonance Raman microspectroscopy to probe carbon dioxide fixation by single cells in microbial communitiesThe ISME Journal, 2011
- Ecological and evolutive implications of bacterial defences against predatorsEnvironmental Microbiology, 2011
- Looking inside the box: using Raman microspectroscopy to deconstruct microbial biomass stoichiometry one cell at a timeThe ISME Journal, 2010
- Raman microspectroscopy reveals long‐term extracellular activity of chlamydiaeMolecular Microbiology, 2010
- Shining Light on the Microbial WorldAdvances in Applied Microbiology, 2010
- Plant-Growth-Promoting RhizobacteriaAnnual Review of Microbiology, 2009
- Single-Cell Ecophysiology of Microbes as Revealed by Raman Microspectroscopy or Secondary Ion Mass Spectrometry ImagingAnnual Review of Microbiology, 2009
- Resolving Genetic Functions within Microbial Populations: In Situ Analyses Using rRNA and mRNA Stable Isotope Probing Coupled with Single-Cell Raman-Fluorescence In Situ HybridizationApplied and Environmental Microbiology, 2009
- Raman‐FISH: combining stable‐isotope Raman spectroscopy and fluorescence in situ hybridization for the single cell analysis of identity and functionEnvironmental Microbiology, 2007