Affinity Maturation
Affinity Maturation - Related Videos
03:07
Electron Affinity
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2020
The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion). This process can be either endothermic or exothermic, depending on the element. Many of these elements have negative values of EA, which means that energy is released when the gaseous atom accepts an electron. However, for some elements, energy is required for the atom to become negatively charged, and the value of their EA is positive. Just as with ionization energy,...
01:41
Affinity and Avidity
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2019
Overview Antibodies bind to toxins or substances on the surface of cells, bacteria, viruses, or fungi. The substance is called an antigen, and the precise binding site is the epitope. The strength of the antibody-epitope interaction is called affinity. When an antibody binds an antigen by multiple epitopes, the cumulative strength of the interaction is called avidity. The strength of the interaction influences the elicited immune response. The Adaptive Immune System Increases Efficiency by...
01:28
Maturation of Endosomes
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2023
The early endosome containing internalized molecules matures through transformations in its location, morphology, intraluminal pH, and membrane protein composition. Together, these changes result in a more acidic late endosome that contains multiple intraluminal vesicles; therefore, the late endosome is also called a multivesicular body (MVB). Changes in location The maturing endosome moves along microtubules from the periphery of the cell towards the perinuclear region. This movement of the...
06:48
A Reporter Assay to Analyze Intronic microRNA Maturation in Mammalian Cells
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Cited by 1 •
2022
We developed an intronic microRNA biogenesis reporter assay to be used in cells in vitro with four plasmids: one with intronic miRNA, one with the target, one to overexpress a regulatory protein, and one for Renilla luciferase. The miRNA was processed and could control luciferase expression by binding to the target sequence.
08:12
In Vitro Differentiation of Mature Myofibers for Live Imaging
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Cited by 33 •
2017
Muscle cells are among the most complex eukaryotic cells. We present a protocol for the in vitro differentiation of highly mature myofibers that allows for genetic manipulation and clear imaging during all developmental stages.
FAQs
Within germinal centers, activated B cells introduce changes into their immunoglobulin genes through somatic hypermutation. These changes create receptor variants that can differ in antigen binding. Cells with stronger binding receive survival and proliferation signals, whereas weaker clones are eliminated. Repeated selection enriches populations whose antibodies recognize the target more effectively, providing the biological model for engineered optimization.
Natural maturation takes place through selection among B-cell variants in germinal centers. In bioengineering, the same selection principle is applied through antibody library screening, directed evolution, and related approaches. These methods allow researchers to optimize antibodies outside the biological setting while focusing on a chosen antigen and design goals such as stronger binding, improved specificity, stability, or function.
Binding affinity describes how strongly an antibody interacts with its antigen, but engineered antibodies may also require greater specificity, stability, or functional performance. An antibody with strong binding may not satisfy the needs of a particular application if it lacks these other properties. Therefore, bioengineering strategies can treat affinity improvement as part of a broader optimization process.
A typical strategy begins with antibody variants represented in a library, followed by screening to identify candidates that bind the selected antigen more strongly. Directed evolution and related methods then apply the same selection logic to improve desired properties. The resulting candidates can be evaluated for affinity, specificity, stability, and function before being developed for a chosen use.
Researchers use these strategies when an existing antibody needs improved performance for a defined purpose. The overview identifies therapeutic antibodies, diagnostic reagents, and research tools as major applications. In each case, library screening or directed evolution can help produce antibody candidates with stronger antigen recognition or with additional properties suited to the intended scientific or practical role.
Antibody optimization can produce candidates with enhanced affinity as well as greater specificity, stability, or function. These outcomes matter because the most useful candidate depends on the application, not solely on antigen-binding strength. Improved variants may therefore support more effective therapeutic antibodies, more suitable diagnostic reagents, or more capable tools for laboratory research.