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Engineering of Methylation State Specific 3xMBT Domain Using ELISA Screening
Dan Od Cohen1,2, Shai Duchin3,2, Michal Feldman1,2
1The Shraga Segal Department of Microbiology, Immunology and Genetics, Ben-Gurion University of the Negev, Be'er Sheva, Israel.
Plos One
|April 26, 2016
Summary
Researchers developed a new assay using the 3XMBT domain to detect lysine methylation states. This tool enables high-throughput screening and engineering of specific methylation binders, advancing the study of protein lysine methylation.
Area of Science:
- Biochemistry
- Molecular Biology
- Epigenetics
Background:
- Lysine methylation, a crucial post-translational modification, plays a significant role in human diseases.
- Existing tools lack the specificity to differentiate between various lysine methylation states (mono-, di-, tri-).
- There is a need for advanced tools to study lysine methylation and its cellular functions.
Purpose of the Study:
- To develop a high-throughput enzyme-linked immunosorbent assay (ELISA) for detecting lysine methylation states.
- To utilize the 3X malignant brain tumor (3XMBT) domain of L3MBTL1 for this purpose.
- To engineer protein variants with specific recognition of methylated lysines.
Main Methods:
- Development of an ELISA using the 3XMBT domain to detect binding to methylated lysines.
- Optimization of the assay for high-throughput screening in crude lysates.
- Protein engineering of the 3XMBT domain to generate mutant libraries and identify specific binders.
Main Results:
- The developed ELISA successfully detects methylated peptides, proteins, and protein lysine methyltransferase (PKMT) activity.
- The assay is optimized for high-throughput screening of mutant libraries in bacterial lysates.
- Engineered 3XMBT variants exhibit exclusive recognition of di-methylated peptides.
Conclusions:
- The new ELISA provides a powerful approach for studying lysine methylation biology.
- This method facilitates the high-throughput screening and engineering of specific lysine methylation binders.
- The findings contribute to a deeper understanding of post-translational modifications and enable engineering of specific binders for other modifications.
