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High-throughput Screening and Biosensing with Fluorescent C. elegans Strains
Published on: May 19, 2011
High-throughput screening for transglutaminase activities using recombinant fluorescent proteins.
Jae-Hun Lee1, Eunjung Song, Sun-Gu Lee
1Interdisciplinary Program for Biochemical Engineering and Biotechnology, Seoul National University, Kwanak-Gu, Seoul, South Korea; Institute of Bioengineering, Seoul National University, Kwanak-Gu, Seoul, South Korea.
Biotechnology and Bioengineering
|June 7, 2013
Summary
A new method uses fluorescent proteins to rapidly screen transglutaminase (TG) activity and substrate specificity. This technique efficiently identifies TG substrates, like the pentapeptide KTKTN for Bacillus TG (BTG).
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- Transglutaminases (TGs) are enzymes crucial in various biological processes.
- Determining TG substrate specificity is essential for understanding their function.
- Existing methods for TG activity evaluation are often time-consuming.
Purpose of the Study:
- To develop a rapid and efficient method for evaluating transglutaminase (TG) activity.
- To screen and identify novel TG substrates using a fluorescence-based assay.
- To determine the relative substrate specificity of TGs, particularly Bacillus TG (BTG).
Main Methods:
- Utilized two recombinant fluorescent proteins, eYFP and DsRed, tagged with TG substrate peptides.
- Engineered a system where TG cross-linking of tagged FPs leads to fluorescence quenching.
- Validated the in vivo fluorescence quenching assay against in vitro reaction data.
Main Results:
- The novel method accurately reflects TG activity through fluorescence intensity changes.
- Demonstrated the system's utility in identifying relative substrate specificities for TGs.
- Identified a pentapeptide, KTKTN, with high reactivity for Bacillus TG (BTG), comparable to the known K₆ substrate.
Conclusions:
- The developed fluorescence-based assay provides a rapid and reliable tool for TG activity evaluation.
- This method facilitates the discovery of new TG substrates and the characterization of enzyme specificity.
- The findings offer a valuable approach for studying TGs across different species.
