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Related Concept Videos

Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Antibody Structure01:10

Antibody Structure

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Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

12.6K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Specific Heat01:16

Specific Heat

67.6K
The specific heat capacity of a substance refers to the energy required to increase the temperature of one gram of that substance by one degree Celcius. Specific heat capacity is often represented in calories (cal), grams (g), and degrees Celsius (oC), but can also be expressed in joules (J), kilograms (kg), and Kelvin (K), among other units.
For example, increasing the temperature of one gram of water by 1°C requires one calorie of heat energy and can be written as 1 cal/g-°C, or...
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Efficient and Site-specific Antibody Labeling by Strain-promoted Azide-alkyne Cycloaddition
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Site-Specific Antibody Functionalization Using Tetrazine-Styrene Cycloaddition.

Benjamin J Umlauf, Kalie A Mix, Vanessa A Grosskopf

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    This summary is machine-generated.

    Researchers developed a novel method for site-specific modification of single-chain antibody fragments (scFvs). This technique enables precise functionalization of biologics, preserving their native properties for therapeutic development.

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    Area of Science:

    • Biotechnology
    • Chemical Biology
    • Protein Engineering

    Background:

    • Biologics, including antibody-drug conjugates, are increasingly vital therapeutics.
    • Effective methods for modifying biologics without altering their native properties are crucial for drug discovery and clinical translation.
    • Site-specific modification is essential for maintaining the integrity and function of complex therapeutic proteins.

    Purpose of the Study:

    • To present a novel method for site-specific, carboxy-terminal modification of single-chain antibody fragments (scFvs).
    • To enable the functionalization of scFvs while preserving their native binding activity.
    • To facilitate downstream laboratory and preclinical applications of modified biologics.

    Main Methods:

    • Yeast surface display was used to isolate and present single-chain antibody fragments (scFvs).
    • Intein-mediated expressed protein ligation (EPL) was employed to append a styrene moiety to the scFv.
    • Inverse electron-demand Diels-Alder (IEDDA) cycloaddition using a styrene-tetrazine pair was utilized for subsequent functionalization.

    Main Results:

    • The method achieved site-specific, carboxy-terminal modification of scFvs.
    • Functionalized scFvs retained their native binding activity.
    • The strategy mitigated potential interference from high thiol concentrations required for EPL.

    Conclusions:

    • A robust method combining EPL and IEDDA cycloaddition allows for site-specific functionalization of scFvs.
    • This approach successfully generates functionalized scFvs with preserved biological activity.
    • The rapid, site-directed functionalization technique holds significant potential for various laboratory and preclinical applications in biologic development.