DNA Staining Peptide-Fluorescent Protein Composition
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Solution Overview
Problem
Current DNA staining methods using organic dyes are hazardous due to potential mutagenicity and cause photocleavage of DNA when irradiated, necessitating the development of safer and more reliable staining materials.
Innovation Solution
A composition comprising a DNA-binding peptide linked to a signal-generating material, such as a fluorescent protein, which effectively stains DNA without causing photocleavage and allows for reversible staining, using a specific peptide structure and linker to enhance binding affinity and reduce background noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If organic dyes (e.g., ethidium bromide, YOYO) are used for DNA staining, then high signal-to-noise ratios and low dissociation constants are achieved, but the dyes act as potential mutagens and cause photocleavage of DNA phosphoric acid backbone when irradiated with laser
Solution Approach 1:
The patent introduces a fluorescent protein (e.g., GFP, RFP) as an intermediary carrier that binds to DNA through a peptide linkage. This mediator system replaces the direct use of harmful organic dyes with a biocompatible protein-based staining agent that provides fluorescence without causing mutagenicity or photocleavage, while maintaining effective DNA binding and signal generation
Solution Approach 2:
The invention creates a composite staining system combining a fluorescent protein with a DNA-binding peptide. This composite structure integrates the signaling function of the fluorescent protein with the DNA affinity of the peptide, resulting in a staining agent that achieves effective DNA visualization without the harmful properties of traditional organic dyes
2Object-affected harmful factors
If fluorescent proteins are used to stain DNA, then safety and prevention of photocleavage are improved, but binding affinity and staining efficiency are reduced compared to organic dyes
Solution Approach 1:
The patent segments the staining function into two distinct components: a fluorescent protein module for safe signal generation and a peptide module for DNA binding. This segmentation allows each component to be optimized independently - the peptide provides strong DNA affinity through specific binding motifs while the fluorescent protein ensures safety and signal quality, overcoming the limitations of using fluorescent proteins alone for DNA staining
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The DNA-binding peptide composition provides safe, efficient, and reversible DNA staining, reducing the risk of photocleavage and background noise, enabling reliable visualization of DNA in various research applications.
Implementation Method 1
The DNA-binding peptide is composed of repetitive connections of a positively charged amino acid and an amino acid having an aromatic ring
Implementation Method 2
The DNA-binding peptide is composed of repetitive connections of a positively charged amino acid and an amino acid having an aromatic ring
Implementation Method 3
A composition comprising a DNA-binding peptide linked to a signal-generating material, such as a fluorescent protein
Data Source
AI summary
The present invention relates to a composition for DNA staining, which can be safely used for researchers, can prevent DNA photocleavage, and can be applied to various fields. According to the present invention, when DNA is stained by using a fluorescent protein and a particular peptide bound to DNA, such a fluorescent protein-peptide is safe to researchers, suppresses DNA photocleavage, and allows reversible staining, thereby enabling efficient DNA staining. Therefore, the composition for DNA staining of the present invention can be variously used in DNA-related research.