Selective Cell Immobilization Using Orthogonal Surface Tags
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Solution Overview
Problem
Conventional methods for immobilizing bacterial cells on surfaces often cause cell damage, reduce biological activity, and result in unstable attachment, leading to inefficient catalytic processes and increased costs due to additional tagging steps and potential cell death.
Innovation Solution
The method involves bacterial cells expressing an orthogonal tag on their surface and a functional protein, which bind specifically to a binding partner via a fusion protein with a corresponding binding unit, allowing for efficient and controlled immobilization using pairs like streptavidin-binding peptide and streptavidin, SpyTag and SpyCatcher, or Halo-Tag and chlorohexane groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chemical immobilization methods (covalent bonding or non-covalent adsorption) are used to attach cells to surfaces, then cell attachment is achieved, but cell damage occurs and biological activity is reduced
Solution Approach 1:
The patent introduces an orthogonal tag system as an intermediary between the cell surface and the solid support. The tag (e.g., SpyTag, HaloTag) is expressed on the cell surface and specifically binds to its complementary binding partner (e.g., SpyCatcher, chlorohexane groups) immobilized on the support. This specific molecular recognition mechanism replaces harsh chemical immobilization methods, enabling stable cell attachment without cell damage or loss of biological activity.
2Ease of operation
If synthetic tagging units (e.g., oligonucleotides) are attached to the cell wall for directed immobilization, then controlled attachment is enabled, but additional time-consuming and costly steps are required causing cell stress
Solution Approach 1:
The patent employs self-assembling orthogonal tag systems where the tag and binding partner automatically recognize and bind to each other through specific molecular interactions. This self-service mechanism eliminates the need for manual attachment of synthetic tags, as the system autonomously achieves controlled cell immobilization through the inherent specificity of the tag-binding partner interaction, reducing both time and operational complexity.
3Object-affected harmful factors
If cells are embedded in hydrogels or included in porous support materials for protection, then cell protection is achieved, but contact area between cells and surrounding medium is restricted reducing catalytic activity
Solution Approach 1:
The orthogonal tag system acts as a mediator that enables cell attachment to solid supports without requiring embedding in hydrogels or porous materials. The specific tag-binding partner interaction provides sufficient attachment stability while maintaining cell accessibility to the surrounding medium, thus preserving catalytic activity while achieving the protective effect of immobilization.
4Reliability
If externally added tagging units are used in continuous processes for cell binding, then selective binding is achieved, but the tagging unit loses its function over the course of the process
Solution Approach 1:
The patent implements preliminary action by genetically encoding the orthogonal tag directly into the cell surface, ensuring its permanent presence and functionality throughout the continuous process. The tag is constitutively expressed and maintained on the cell surface, eliminating the need for continuous addition of external tagging units and ensuring sustained selective binding capability over extended operational periods.
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 simple, gentle, and well-controlled selective binding, enhancing the stability and catalytic activity of bacterial cells for applications in biocatalysts, biosensors, and bioreactors, while reducing costs and cell stress.
Implementation Method 1
the bacterial cells bind via their tag to the corresponding tag on the binding partner, the tag and the binding unit being chosen such that the tag binds specifically and exclusively to the binding unit
Data Source
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AI summary
The present invention relates to methods for selectively binding cells to a binding partner, such as a solid support material, other cells or proteins, devices comprising corresponding support materials with cells immobilized thereon, cell aggregates and binding complexes, and their use as a biocatalyst, biosensor and/or bioreactor.