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Improved SILAC method for double labeling of bacterial proteome
Junlong Han1, Shuhong Yi1, Xinlu Zhao1
1Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University, Guangzhou 510632, China.
Journal of Proteomics
|December 16, 2018
Summary
Stable isotope labeling with amino acids in cell culture (SILAC) now works for bacteria. Supplementing media with high amino acid concentrations improves labeling efficiency and accuracy for bacterial proteomics.
Area of Science:
- Proteomics
- Microbiology
- Biochemistry
Background:
- Stable isotope labeling with amino acids in cell culture (SILAC) is a widely used proteomics technique for mammalian cells.
- Bacterial amino acid conversion reduces SILAC labeling efficiency and accuracy, limiting its application.
Purpose of the Study:
- To overcome limitations of SILAC in bacterial proteomics.
- To develop a method for efficient and accurate SILAC labeling in diverse bacteria.
Main Methods:
- Supplementing SILAC minimal medium with high concentrations of both heavy and light isotope-labeled amino acids.
- Optimizing amino acid supplementation for different bacterial species.
Main Results:
- High amino acid concentrations effectively inhibited bacterial amino acid conversion.
- Achieved complete amino acid incorporation into the bacterial proteome with high accuracy and reproducibility.
- Demonstrated successful application in both gram-positive and gram-negative bacteria.
Conclusions:
- This enhanced SILAC method enables efficient double labeling in bacteria.
- The technique facilitates broad application of quantitative proteomics in bacterial research.
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