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Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones01:24

Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones

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Acetals are formed by reacting two equivalents of alcohol with carbonyl compounds like aldehydes or ketones. Acetals are unaffected by bases, nucleophiles, oxidizing agents, and reducing agents. They serve as protecting groups for aldehydes and ketones. Acetals can be easily formed and also easily removed via mild acid hydrolysis.
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Affinity Chromatography

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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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Amines to Amides: Acylation of Amines01:19

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Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
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Alkynes undergo oxidative cleavage in the presence of oxidizing reagents like potassium permanganate and ozone. The triple bond — one σ bond and two π bonds — is completely cleaved, and the alkyne is oxidized to carboxylic acids. When warm and basic aqueous potassium permanganate is used as an oxidizing agent, alkynes are first converted to carboxylate salts via an unstable α-diketone intermediate. Further, a mild acid treatment protonates the carboxylate anions...
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Similar to water, alcohols can add to the carbonyl carbon of the aldehydes and ketones. The addition of one molecule of alcohol to the carbonyl compound forms the hemiacetal or half acetal. As depicted below, in a hemiacetal, the carbon is directly linked to an OH and OR group.
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Cyclic acetals as cleavable linkers for affinity capture.

Siyeon Lee1, Wei Wang, Younjoo Lee

  • 1Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA. nicole.sampson@stonybrook.edu.

Organic & Biomolecular Chemistry
|July 9, 2015
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Summary
This summary is machine-generated.

Researchers developed a novel cyclic acetal biotin probe for protein analysis. This probe offers mild acidic elution, improving signal-to-noise ratios and simplifying protein purification and identification in proteomics research.

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Area of Science:

  • Proteomics
  • Biochemistry
  • Chemical Biology

Background:

  • Biotinylation is crucial for protein identification and purification due to high affinity for streptavidin.
  • Alkyne-azide cycloaddition facilitates targeted protein labeling with biotin probes.
  • Harsh elution conditions for traditional biotin tags compromise signal-to-noise ratios and complicate analysis.

Purpose of the Study:

  • To develop an improved biotin probe for protein affinity capture.
  • To overcome limitations associated with harsh elution conditions in biotin-based protein purification.
  • To introduce a cleavable linker for enhanced protein analysis.

Main Methods:

  • Synthesis of a novel cyclic acetal biotin probe from accessible starting materials.
  • Application of the probe for labeling proteins in cell lysates.
  • Evaluation of probe stability and cleavage under various conditions.
  • Assessment of protein recovery and downstream analysis post-elution.

Main Results:

  • The cyclic acetal biotin probe is easily synthesized and stable in cell lysates.
  • The probe is efficiently cleaved under mild acidic conditions, unlike traditional biotin tags.
  • Mild elution conditions preserve protein integrity and improve signal quality.
  • The cleaved probe yields an aldehyde for potential further protein modification.

Conclusions:

  • The cyclic acetal biotin probe offers a mild and effective alternative for protein affinity capture and analysis.
  • This method enhances proteomics workflows by simplifying protein purification and improving data quality.
  • The probe's design facilitates broader applications in protein research and discovery.