Native BAD-1 Protein Purification for Blastomyces Diagnostics
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Solution Overview
Problem
Current methods for diagnosing blastomycosis, particularly those using BAD-1 as a biomarker, suffer from false positives due to cross-reactivity with common fungal antigens, and existing purification techniques rely on recombinant proteins with affinity tags, which can be unstable and costly.
Innovation Solution
A method for purifying native BAD-1 protein or protein fragments without a 6×His tag using nickel-chelating resin, followed by removal of contaminating carbohydrates, to produce highly pure samples for use in diagnostic tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If recombinant BAD-1 proteins with 6×His tag are used for purification, then purification can be achieved via nickel affinity chromatography, but the proteins become unstable and costly to produce
Solution Approach 1:
The invention extracts and removes the problematic 6×His tag from the BAD-1 protein sequence, utilizing only the native BAD-1 protein or specific fragments without the recombinant tag. This extraction of the unstable component resolves the contradiction by maintaining purification capability through alternative means while eliminating the source of instability and cost issues associated with recombinant production
Solution Approach 2:
Instead of adding a His tag to enable purification (the conventional approach), the invention inverts the strategy by purifying native BAD-1 protein without any tag. The purification is achieved by exploiting the inherent properties of native BAD-1, reversing the conventional recombinant approach and thereby eliminating the stability and cost problems associated with tagged proteins
2Measurement precision
If BAD-1 is used as a biomarker for diagnosing blastomycosis, then diagnostic sensitivity is improved, but false positives occur due to cross-reactivity with common fungal antigens
Solution Approach 1:
The invention applies local quality by selecting specific regions or fragments of the BAD-1 protein that possess unique epitopes not found in other fungal antigens. By focusing on particular local regions of BAD-1 with distinctive characteristics, the diagnostic test achieves high sensitivity while avoiding cross-reactivity with common fungal antigens that cause false positives
Solution Approach 2:
The invention segments the full-length BAD-1 protein into specific fragments or domains that retain diagnostic specificity. By dividing the protein into smaller functional units with unique antigenic properties, the test maintains high sensitivity for blastomycosis detection while eliminating cross-reactive portions that would cause false positives with other fungal infections
3Reliability
If native BAD-1 protein is purified without affinity tags, then protein stability and cost-effectiveness improve, but purification complexity increases
Solution Approach 1:
The invention applies universality by developing a purification protocol using nickel-chelating resin that can purify native BAD-1 protein without requiring specific affinity tags. The method utilizes the inherent metal-binding properties of native BAD-1, creating a universal purification approach that simplifies the process while maintaining protein stability and avoiding the need for complex recombinant expression systems
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
This approach results in highly pure native BAD-1 protein or protein fragments, enhancing diagnostic sensitivity and specificity, reducing false positives, and providing a more economical and stable alternative to recombinant protein methods.
Implementation Method 1
purifying the native BAD-1 protein or protein fragments from the solution by the steps of: i). combining the native BAD-1 protein or protein fragments-containing solution with a suitable divalent cation, ii). washing the suitable divalent cation to remove unbound matter, and iii). eluting the native BAD-1 protein or protein fragments from the nickel-chelating resin
Data Source
AI summary
Methods for obtaining highly pure native, recombinant or modified BAD-1 protein include the steps of culturing a population of microbes expressing BAD-1 protein in a culture medium, collecting the population of microbes from the culture medium, obtaining a BAD-1 protein-containing solution, and purifying the BAD-1 protein from the solution by combining the BAD-1 protein-containing solution with a nickel-chelating resin, washing the nickel-chelating resin to remove unbound matter, and eluting the BAD-1 protein from the nickel-chelating resin. Highly pure native BAD-1 protein may be used in diagnostic kits for detecting Blastomyces dermatitidis infections in animals.