Recombinant Factor C Composition for Thermostable Endotoxin Detection
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Solution Overview
Problem
Existing endotoxin detection methods rely on limulus amebocyte lysate, which is unsustainable and lacks thermostability, necessitating the development of recombinant Factor C proteins with improved thermal stability for reliable endotoxin detection.
Innovation Solution
Introduce specific amino acid substitutions into the Factor C protein sequence, such as Leu at positions F191, F423, F558, F670, L971, A974, and G1004, enhancing thermostability to 95% or higher amino acid sequence identity with SEQ ID NO: 3, and develop a reagent for detecting endotoxin using this modified Factor C protein.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If limulus amebocyte lysate is used for endotoxin detection, then detection capability is achieved, but sustainability is compromised due to finite bioresource
Solution Approach 1:
The patent creates a recombinant Factor C protein that copies the essential endotoxin-detecting function of natural LAL. By expressing Factor C in heterologous host cells through genetic engineering, the invention produces a sustainable substitute that replicates the detection capability without depleting horseshoe crab populations.
Solution Approach 2:
The patent replaces the biological extraction process (mechanical harvesting from living crabs) with a biochemical production system. Recombinant DNA technology and cell culture methods substitute for the mechanical extraction of LAL from horseshoe crabs, enabling sustainable production through genetic replication rather than physical harvesting.
2Reliability
If conventional LAL reagents are used, then endotoxin detection is performed, but thermostability is insufficient for reliable measurement
Solution Approach 1:
The patent optimizes the Factor C protein's amino acid sequence and expression conditions to enhance thermostability. By modifying molecular parameters such as protein folding, post-translational modifications, and buffer composition, the recombinant Factor C maintains structural integrity and catalytic activity at elevated temperatures, ensuring reliable endotoxin detection under varying thermal conditions.
3Loss of substance
If recombinant Factor C is developed as alternative, then sustainability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the production system into modular components: genetic construct design, host cell selection, culture conditions optimization, and purification protocols. This segmentation allows each aspect to be independently optimized and controlled, reducing overall manufacturing complexity while enabling sustainable recombinant Factor C production.
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 modified Factor C protein exhibits enhanced thermostability, enabling stable and reliable endotoxin detection without relying on limulus amebocyte lysate, addressing sustainability concerns and ensuring accurate measurement in pharmaceutical and medical applications.
Implementation Method 1
The activated Factor B is also a hydrolase, which converts a proclotting enzyme into an activated clotting enzyme. A clotting enzyme is a hydrolase. There is a method of measurement comprising hydrolyzing a synthetic substrate, such as a peptide-label, with the use of this hydrolytic activity
Data Source
Figure 1
AI summary
The present disclosure provides a means that enables detection of endotoxin. The present disclosure also provides a reagent for detecting endotoxin with thermostability. The present disclosure provides a recombinant Factor C protein having given amino acid substitution, a polynucleotide encoding the same, a reagent for detecting endotoxin comprising the same, and a method for producing the same.