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Acid-Catalyzed Aldol Addition Reaction

Acid-Catalyzed Aldol Addition Reaction

The aldol reaction of a ketone under acidic conditions successfully forms an unsaturated carbonyl as the final product instead of an aldol. The acid-catalyzed aldol reaction is depicted in Figure 1.

Base-Catalyzed Aldol Addition Reaction

Base-Catalyzed Aldol Addition Reaction

As depicted in Figure 1, base-catalyzed aldol addition involves adding two carbonyl compounds in aqueous sodium hydroxide to form a β-hydroxy carbonyl compound.

Crossed Aldol Reaction Using Strong Bases: Directed Aldol Reaction

Crossed Aldol Reaction Using Strong Bases: Directed Aldol Reaction

The reaction between two different carbonyl compounds comprising α hydrogen in the presence of a strong base like lithium diisopropylamide (LDA) to form a crossed aldol product is known as a directed aldol reaction. The directed aldol reaction is depicted in Figure 1.

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Chemically-blocked Antibody Microarray for Multiplexed High-throughput Profiling of Specific Protein Glycosylation in Complex Samples

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Multiple catalytic aldolase antibodies suitable for chemical programming.

Rajib Kumar Goswami¹, Zheng-Zheng Huang, Jane S Forsyth

¹The Skaggs Institute for Chemical Biology, Department of Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.

Bioorganic & Medicinal Chemistry Letters

|May 12, 2009

Summary

Researchers chemically programmed murine antibodies with aldolase activity using diketone or pro-vinyl ketone linkers. Three new antibodies (84G3, 85H6, 90G8) showed specific binding to human tumor cells expressing integrin alpha(v)beta(3.).

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Area of Science:

Chemical Biology
Immunology
Biochemistry

Background:

Catalytic antibodies offer precise chemical reaction control.
Integrin adhesion receptors are crucial in tumor cell interactions.
Chemical programming enables tailored antibody functionalities.

Purpose of the Study:

To investigate chemical programming of murine antibodies with aldolase activity.
To evaluate the efficacy of diketone and pro-vinyl ketone linkers for antibody functionalization.
To develop novel antibodies targeting tumor-associated integrins.

Main Methods:

Utilized nine murine antibodies with inherent catalytic aldolase activity.
Employed diketone and pro-vinyl ketone linkers for antibody programming.
Assessed antibody binding specificity to human tumor cells expressing integrin alpha(v)beta(3.).

Main Results:

Most antibodies were successfully programmed using diketone linkers, mirroring previous methods.
Efficient catalysis of the retro aldol reaction by antibodies was crucial for pro-vinyl ketone linker programming.
Three newly developed antibodies (84G3, 85H6, 90G8) demonstrated high specific binding to target tumor cells.

Conclusions:

Chemical programming is effective for creating functional catalytic antibodies.
Linker chemistry influences the success of antibody programming and activity.
Engineered antibodies show promise for targeted cancer therapies by targeting integrin alpha(v)beta(3.).