Split GFP Protein Tagging System for Solubility Assessment
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Solution Overview
Problem
Current protein tagging and detection systems are limited by the need for external reagents, poor folding characteristics, and the requirement for fused heterologous polypeptide domains to drive reconstitution of fluorescent reporters, which restricts their use in assessing protein solubility in vivo and in vitro.
Innovation Solution
A split-fluorescent protein tagging system based on self-complementing fragments of GFP, which spontaneously associate without external reagents, providing a sensitive analytical signal for protein solubility assessment in both in vivo and in vitro environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GFP is used as a protein tagging agent, then protein detection sensitivity is improved, but the system requires external reagents and fused heterologous polypeptide domains which increases device complexity and restricts in vivo use
Solution Approach 1:
The GFP protein is divided into two separate fragments (GFP1-10 and GFP11) that can function independently. GFP1-10 serves as a stable scaffold that can be fused to target proteins, while GFP11 contains the chromophore-forming region. This segmentation eliminates the need for heterologous polypeptide domains and external reagents, as the fragments self-assemble through their native interfaces to restore fluorescence.
2Adaptability or versatility
If split GFP fragments are used for protein solubility assessment, then the ability to report soluble and insoluble fractions is improved, but the fragments may misfold or aggregate which worsens reliability
Solution Approach 1:
The GFP1-10 fragment is engineered in advance to contain all necessary structural elements for stable folding and solubility, including the complete beta-barrel scaffold and alpha-helices. This preliminary optimization ensures that GFP1-10 remains properly folded and soluble even when expressed separately from GFP11, eliminating misfolding issues before the complementation step occurs.
3Loss of time
If traditional protein tagging methods are used, then multiple detection steps are required which increases loss of time, but the split GFP system enables rapid quantification
Solution Approach 1:
The split GFP system is designed to be self-sufficient, where GFP1-10 and GFP11 automatically self-assemble through their complementary interfaces to form the functional fluorescent protein. This self-service mechanism eliminates the need for external reagents, chemical substrates, or multiple detection steps, enabling rapid quantification of protein solubility directly in living cells or lysates.
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
Enables rapid and sensitive quantification of proteins, reporting both soluble and insoluble protein fractions, and works in living cells, overcoming the limitations of existing systems by ensuring long-term stability and solubility prior to complementation.
Implementation Method 1
self-complementing fragments of GFP, which spontaneously associate without external reagents
Data Source
AI summary
The invention provides a protein labeling and detection system based on self-complementing fragments of fluorescent and chromophoric proteins. The system of the invention is exemplified with various combinations of self-complementing fragments derived from Aequorea victoria Green Fluorescent Protein (GFP), which are used to detect and quantify protein solubility in multiple assay formats, both in vitro and in vivo.