Tagged Rad51 Protein Residue 54-55 Insertion
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Solution Overview
Problem
Current GFP-tagged Rad51 proteins are not fully functional, limiting their effectiveness in studying DNA repair mechanisms and cancer treatment, as they are sensitive to genotoxic stress and poorly functional in homologous recombination and alternative lengthening of telomeres pathways.
Innovation Solution
A fully functional tagged Rad51 protein is developed with a tag inserted between residues 54 and 55, utilizing peptide linkers and fluorescent protein tags like mTagBFP2 or Superfolder GFP, which maintains the protein's functionality and allows real-time monitoring of its dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If GFP-tagged Rad51 constructs are expressed in cells to trace dynamics, then real-time monitoring capability is improved, but protein functionality deteriorates
Solution Approach 1:
The Rad51 protein is segmented into three functional domains: N-terminal region (residues 1-53) for DNA binding and recombinase activity, fluorescent tag region (residues 54-56) for detection, and C-terminal region (residues 57-376) for filament formation and interaction with partner proteins. This segmentation allows the fluorescent tag to be positioned in a location that does not interfere with the critical N-terminal and C-terminal functional domains, thereby maintaining protein functionality while enabling real-time monitoring.
Solution Approach 2:
A peptide linker acts as an intermediary between the Rad51 protein and the fluorescent tag. The linker provides flexibility and spatial separation, ensuring that the fluorescent tag does not sterically hinder the Rad51 protein's interaction with DNA or other proteins. This intermediary element allows the tag to be present without compromising the protein's biological activity.
2Measurement precision
If terminal GFP-tagged Rad51 is used to trace dynamics, then detection capability is improved, but functional accuracy in DNA repair studies deteriorates
Solution Approach 1:
The protein is divided into functional segments with the fluorescent tag placed in the middle region (residues 54-56) rather than at the N- or C-terminus. This segmentation ensures that the detection capability is provided by the fluorescent tag while the functional accuracy is maintained by preserving the integrity of the terminal regions that are critical for DNA repair functions.
Solution Approach 2:
Different regions of the Rad51 protein are assigned different qualities: the N-terminal region maintains high functional quality for DNA binding, the central region (where the tag is inserted) provides detection quality, and the C-terminal region maintains functional quality for filament formation. This local differentiation of quality allows simultaneous optimization of detection and function.
3Adaptability or versatility
If tagged Rad51 constructs are created to study mechanisms, then research tool value is improved, but sensitivity to genotoxic stress increases
Solution Approach 1:
By segmenting the Rad51 protein and placing the fluorescent tag in the central region away from critical functional domains, the protein's sensitivity to genotoxic stress is reduced. The N-terminal region, which is crucial for DNA binding and repair function, remains untagged and fully functional, allowing the protein to maintain its natural response to DNA damage without the interference of a terminal tag.
Data Source
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AI summary
Invention belongs to the field of molecular biology. Invention relates to a fully functional tagged Rad51 protein which constitutes a valuable tool for studying the homologous recombination pathway and alternative lengthening of telomeres. More particularly the invention relates to a fully functional tagged Rad51 protein comprising a tag between residues 54 and 55 of Pad 51 protein of SEQ ID NO:1 or between corresponding residues of any budding yeast ortholog thereof. Accordingly, the invention relates also to methods of screening candidate compounds capable of interfering with such mechanisms and to method of screening drugs useful in cancer treatment.