Ovalbumin-Chimeric Proteins for Glucose Transporter Detection
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Solution Overview
Problem
There is a lack of positive controls for membrane-bound glucose transporter proteins like GLUT1, GLUT4, GLUT5, and GLUT12, which are difficult to purify due to their hydrophobic nature, making it challenging to accurately detect and quantify these proteins in western blotting experiments.
Innovation Solution
The development of ovalbumin-chimeric proteins, where the codons of the ovalbumin coding region are modified to include specific amino acids from glucose transporter proteins, creating soluble and easily purified chimeric proteins that can be used as positive controls in western blotting, allowing for accurate detection with available antibodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If membrane-bound glucose transporter proteins are used as positive controls, then detection accuracy is improved, but purification difficulty increases due to hydrophobic nature
Solution Approach 1:
The patent uses an intermediary approach by creating chimeric proteins that combine the hydrophilic ovalbumin portion with the hydrophobic glucose transporter epitope. This intermediary structure allows the hydrophobic epitope to be presented in a water-soluble context, enabling purification and detection without requiring purification of the entire hydrophobic membrane protein.
Solution Approach 2:
The patent creates a simplified copy or representation of the glucose transporter protein by using only the critical epitope region (15-20 amino acids) rather than the entire protein. This epitope copy can be detected by antibodies specific to the glucose transporter, providing a workable positive control that avoids the purification problems of the full hydrophobic protein.
2Measurement precision
If highly purified proteins are used as positive controls, then experimental accuracy is improved, but water solubility requirements limit available proteins
Solution Approach 1:
The patent changes the solubility parameter of the glucose transporter epitope by fusing it to ovalbumin. This parameter change transforms the hydrophobic epitope into a water-soluble chimera, making it available for use as a positive control without requiring extreme purification conditions.
3Ease of manufacture
If ovalbumin-chimeric proteins are created, then ease of purification is improved, but protein complexity increases
Solution Approach 1:
The patent segments the glucose transporter protein into its essential epitope portion (15-20 amino acids) and combines it with the separate ovalbumin portion. This segmentation allows the small epitope segment to be purified easily as part of the larger ovalbumin-chimera, reducing overall purification complexity while maintaining detection capability.
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 ovalbumin-chimeric proteins effectively serve as positive controls, enabling accurate quantification and detection of glucose transporter proteins, as demonstrated by their use in experiments showing increased expression of GLUT4 and GLUT12 in muscle tissue after exercise training, and providing a standard for comparing protein concentrations in western blotting.
Implementation Method 1
There are many antibodies available that may be used in western blotting that bind to glucose transporter proteins, so when an ovalbumin chimeric protein is located in a gel and a proper antibody is applied thereto, the antibody is effectively 'tricked' such that it appears as if a chain of an entire glucose transport protein were present.
Implementation Method 2
In immunoblotting gel electrophoresis is used to separate native or denatured proteins. For example, one mode of separation using gel electrophoresis separates proteins based on molecular weight.
Data Source
AI summary
Positive controls for experimentation related to membrane-bound glucose transporter proteins and methods for preparing such positive controls, such proteins including GLUT1, GLUT4, GLUT5, and GLUT12.