Marker Polypeptide Detection for Snake Venom Thrombin Specificity
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Solution Overview
Problem
Current methods lack specificity and sensitivity in characterizing the species source and content of snake venom-like thrombin, particularly for Bothrops atrox, which affects the quality control and efficacy of hemostatic products.
Innovation Solution
A marker polypeptide with the amino acid sequence EAYNGLPAK is used, combined with a method involving trypsin enzymolysis and liquid chromatography-mass spectrometry for detecting the species source and content of snake venom-like thrombin, utilizing specific chromatographic and mass spectrometry conditions to identify and quantify the thrombin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods are used for snake venom-like thrombin, then the detection process is simple, but the measurement precision and reliability are insufficient
Solution Approach 1:
The detection method is segmented into distinct stages: trypsin enzymolysis pre-treatment to release marker polypeptides, followed by liquid chromatography separation, and finally mass spectrometry detection. This segmentation allows each stage to be optimized independently, achieving high measurement precision through specialized techniques at each step while managing overall complexity through systematic organization.
Solution Approach 2:
The marker polypeptide serves as an intermediary substance that specifically binds to or represents the snake venom-like thrombin. By detecting this intermediate marker rather than the complete thrombin molecule directly, the method achieves higher detection accuracy and reliability while enabling the use of sophisticated analytical techniques.
2Measurement precision
If conventional detection methods are used, then the detection limit is high, but the sensitivity for characterizing species source and content is insufficient
Solution Approach 1:
The method extracts and isolates the specific marker polypeptide sequence from the complex snake venom mixture through trypsin enzymolysis. By taking out this specific marker component and detecting it separately using liquid chromatography and mass spectrometry, the detection sensitivity is dramatically improved, achieving a detection limit of 0.5 ng/mL and quantification limit of 1.25 ng/mL.
Solution Approach 2:
The detection sensitivity is enhanced by changing key parameters: using electrospray ionization in positive ion mode for mass spectrometry, optimizing the liquid chromatography mobile phase composition and gradient, and selecting specific mass-to-charge ratio transitions for monitoring. These parameter optimizations enable detection at extremely low concentrations.
3Reliability
If a specific marker polypeptide detection method is implemented, then the reliability for species source characterization is improved, but the device complexity and detection cost increase
Solution Approach 1:
The method replaces traditional immunological or biochemical assays with mass spectrometry-based detection. This substitution provides superior reliability for species source characterization because mass spectrometry directly measures the molecular mass and fragmentation pattern of the marker polypeptide, offering definitive identification that is not susceptible to cross-reactivity or antibody variability issues.
Solution Approach 2:
The marker polypeptide detection method serves multiple functions simultaneously: it identifies the species source of the snake venom-like thrombin, quantifies the thrombin content in the sample, and validates the authenticity of hemostatic products. This multi-functionality justifies the investment in sophisticated detection equipment by providing comprehensive quality control in a single analytical platform.
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 enables high accuracy and sensitivity in detecting Bothrops atrox-like thrombin, improving the quality control of snake venom hemocoagulase-like products and ensuring their safety and efficacy in clinical use, with a detection limit of 0.5 ng/mL and quantification limit of 1.25 ng/mL.
Implementation Method 1
adding a trypsin to a sample to be detected to perform enzymolysis pre-treatment
Implementation Method 2
performing qualitative ion pair and quantitative ion pair detection on the supernatant
Implementation Method 3
liquid chromatography-mass spectrometry for detecting the species source and content of snake venom-like thrombin
Data Source
AI summary
Disclosed are specifically a marker polypeptide of a Bothrops atrox-like thrombin and a method thereof for detecting species source and content of a snake venom-like thrombin and an application, relating to the technical field of snake venom detection. An amino acid sequence of the marker polypeptide is EAYNGLPAK (SEQ ID NO:1), and the marker polypeptide may be used to detect the species source and content of the snake venom-like thrombin in a sample. The marker polypeptide of the present disclosure may play an important role in characterizing the species source and content of the snake venom-like thrombin in the sample, and fill in the blank of a quality standard of snake venom of the Bothrops atrox.