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Related Concept Videos

Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

3.9K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Preparation of Amines: Alkylation of Ammonia and Amines01:30

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Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
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Preparation of 1° Amines: Gabriel Synthesis01:28

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3.5K
Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
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Structure of Amines01:19

Structure of Amines

2.5K
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
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Tagging and Fusion Proteins

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Proteins are involved in several cellular processes and biochemical reactions. Analyzing a specific protein of interest requires it to be isolated from the other proteins in the cell. This is achieved by overexpressing the specific gene in a suitable host to produce large quantities of the target protein. A tag or label is recombined with the gene to produce a fusion protein containing the target protein and the tag. The tags on these fusion proteins can then be used for easy detection and...
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Synthetic Amine Linkers for Efficient Sortagging.

Tetiana Bondarchuk1, Diana Vaskiv1, Elena Zhuravel1

  • 1Enamine Ltd. (www.enamine.net), Winston Churchill Street 78, Kyiv 02094, Ukraine.

Bioconjugate Chemistry
|July 12, 2024
PubMed
Summary
This summary is machine-generated.

Sortase-mediated ligation, a bioconjugation technique, is improved by identifying optimal nonpeptidic amine substrates for Sortase A. This enhances protein conjugation efficiency for diverse applications like nanobody biotinylation.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Protein Engineering
  • Chemical Biology

Background:

  • Enzymatic site-specific bioconjugation, particularly sortase-mediated ligation, is vital for creating conjugated proteins.
  • Improving sortagging efficiency with diverse substrates is crucial for expanding its applications.
  • Sortase A from *Staphylococcus aureus* is a key enzyme in this process.

Purpose of the Study:

  • To identify optimal structural motifs for nonpeptidic amine nucleophile substrates for Sortase A.
  • To enhance the efficiency and versatility of sortase-mediated ligation.
  • To demonstrate the utility of identified linkers for protein modification.

Main Methods:

  • A comprehensive comparative mass spectrometry screening of 452 synthetic nonpeptidic amine-containing substrates.
  • Evaluation of primary and secondary amine nucleophiles for Sortase A ligation.
  • Demonstration of optimized amine linkers for C-terminal biotinylation of nanobodies.

Main Results:

  • Identification of optimal structural features for nonpeptidic Sortase A substrates.
  • Screening revealed key motifs that enhance sortagging reaction efficiency.
  • Representative amine linkers enabled efficient C-terminal biotinylation of nanobodies.

Conclusions:

  • The study provides crucial insights into the structure-activity relationship of Sortase A substrates.
  • Optimized nonpeptidic substrates significantly improve sortagging efficiency.
  • This work facilitates broader applications of sortase-mediated bioconjugation, including nanobody functionalization.