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Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

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Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
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Affinity chromatography is a powerful technique extensively utilized for separating and purifying specific biomolecules from complex mixtures. It capitalizes on the highly selective binding between an analyte and its counterpart, such as antibody-antigen interactions. The counterpart is immobilized on the stationary phase, forming an affinity column. The stationary phase typically consists of solid support, such as agarose or porous glass beads, immobilizing the affinity ligand. The mobile...
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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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Sulfation and α-amino acid conjugation are two critical biotransformation reactions in drug metabolism. Sulfation, a phase II biotransformation reaction, involves adding a polar sulfate group to a drug, enhancing its water solubility and promoting excretion. This process can either co-occur with or occur independently of glucuronidation. Nonmicrosomal sulfotransferase enzymes catalyze the process. The reaction involves 3'-phosphoadenosine-5'-phosphosulfate or PAPS coenzyme...
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Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
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Secondary amine selective Petasis (SASP) bioconjugation.

Yonnette E Sim1, Ogonna Nwajiobi2, Sriram Mahesh2

  • 1Department of Chemistry and Biochemistry , Seton Hall University , South Orange , New Jersey 07079 , USA.

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|February 29, 2020
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Summary

A new secondary amine selective Petasis (SASP) reaction enables selective bioconjugation at N-terminal proline in proteins. This method offers a unique solution for modifying peptides and proteins under physiological conditions.

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Area of Science:

  • Chemical Biology
  • Organic Chemistry
  • Bioconjugation Chemistry

Background:

  • Selective protein modification is crucial for applications like antibody-drug conjugates and materials science.
  • Existing methods often target the N-terminus or lysine residues, but lack selectivity for N-terminal proline or other secondary amines.
  • N-terminal proline shares similar basicity with lysine, posing a challenge for selective modification.

Purpose of the Study:

  • To develop a novel chemical method for selective bioconjugation at N-terminal proline residues.
  • To address the limitations of current methods in modifying secondary amines, particularly N-terminal proline, in unprotected peptides and proteins.
  • To establish a versatile tool for creating dual-labeled bioconjugates in a single step.

Main Methods:

  • Development of the secondary amine selective Petasis (SASP) reaction, a multicomponent reaction.
  • Exploitation of the reactivity of secondary amines with aldehydes to form iminium ions, followed by reaction with organoboronates.
  • Application of the SASP reaction under biocompatible and physiological conditions on various peptides and proteins.

Main Results:

  • The SASP reaction demonstrates high chemoselectivity and stereoselectivity (>99% de) for N-terminal proline.
  • This method allows for selective modification of secondary amines on completely unprotected peptides and proteins.
  • The reaction is effective under physiological conditions and enables one-pot synthesis of dual-labeled bioconjugates.
  • Successful application demonstrated on proteins such as aldolase and creatine kinase.

Conclusions:

  • The SASP reaction represents the first method for selective modification of secondary amines at N-terminal proline in peptides and proteins.
  • This novel bioconjugation strategy offers significant advantages in terms of selectivity and efficiency.
  • The SASP reaction provides a powerful tool for synthesizing complex bioconjugates with broad utility in various biological applications.