Shark-Derived Single Domain Antibody Production via Bacterial Expression
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Solution Overview
Problem
The high cost and complexity of producing conventional antibodies, particularly the challenges of producing stable and specific antibody fragments like single domain antibodies (sdAbs) due to the need for mammalian cell lines and costly camel farming, along with the limitations of existing high-throughput technologies like phage display, hinder their widespread application in biomedical fields.
Innovation Solution
A cost-effective method for producing high-affinity sdAbs using bacterial production and fluorescence-activated cell sorting (FACS) techniques, involving immunization of cartilaginous fish like sharks, extraction of RNAs, reverse transcription, and insertion into bacterial vectors for recombinant expression, allowing for efficient selection and production of target-specific sdAbs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antibodies are produced using mammalian cell lines, then the antibodies have high stability and specificity, but the production cost is high and the process is complex
Solution Approach 1:
The patent extracts and utilizes only the variable heavy-chain domain (VHH) from the complete antibody structure to create single-domain antibodies (sdAbs). This extraction allows production in simpler microbial hosts while retaining antigen-binding functionality, thereby reducing production complexity while maintaining specificity.
Solution Approach 2:
The patent replaces expensive and complex mammalian cell line systems with cheaper, easier-to-culture microbial hosts (E. coli, yeast) for producing the essential antigen-binding fragment (VHH). This substitution reduces production costs and simplifies the manufacturing process while maintaining functional effectiveness.
2Reliability
If camel farming is used to produce sdAbs, then the sdAbs can be obtained with high specificity, but the production cost is very high
Solution Approach 1:
The patent replaces expensive camel farming with inexpensive microbial hosts (E. coli, yeast) that can be cultured in simple media. The VHH genes are expressed in these microbial systems, dramatically reducing production costs while maintaining sdAb specificity and functionality.
Solution Approach 2:
The patent uses recombinant DNA technology as an intermediary, cloning VHH genes into microbial expression vectors. This molecular mediator allows the transfer of the antigen-binding function from camel immunology to microbial production systems, eliminating the need for expensive animal farming.
3Productivity
If phage display technology is used for high-throughput selection, then the throughput of antibody selection is improved, but the process becomes more complex and requires extensive washing steps
Solution Approach 1:
The patent replaces the mechanical phage display system with a soluble VHH expression system that can be directly assayed using ELISA or other binding assays. This substitution eliminates the complex phage assembly, purification, and washing steps while maintaining high-throughput selection capability through direct antibody-antigen interaction measurements.
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 method enables the low-cost, high-efficiency production of shark-derived sdAbs with favorable size and cryptic epitope recognition properties, making them suitable for diagnostic and therapeutic applications, reducing the reliance on camel farming and improving the throughput of antibody production.
Implementation Method 1
administering an immunizing mixture containing a target antigen to a cartilaginous fish for at least two times
Implementation Method 2
extracting RNAs from the blood sample
Implementation Method 3
subjecting the RNAs to reverse transcription to obtain a complementary DNA
Implementation Method 4
inserting the cDNA into a vector to produce a recombinant plasmid; and introducing the recombinant plasmid into a bacterial cell to form a recombinant cell
Data Source
AI summary
A method of producing an antibody fragment for a target antigen includes administering an immunizing mixture containing the target antigen to a cartilaginous fish for at least two times; collecting a blood sample from the cartilaginous fish; extracting RNAs from the blood sample; subjecting said RNAs to reverse transcription to obtain a complementary DNA, and optionally amplifying the cDNA to obtain a mixture of amplified cDNAs followed by purification. Also covered are methods of producing an antibody fragment from a shark; antibody fragments obtained from the method; a kit comprising antibody fragments; and methods of determining the presence and/or amount of a target antigen in a sample.