Related Experiment Video
Updated: Jul 5, 2026
05:57
Synthesizing Amino Acids Modified with Reactive Carbonyls in Silico to Assess Structural Effects Using Molecular Dynamics Simulations
Published on: April 26, 2024
Modification of amino groups
1Pfizer, Inc., Groton, Connecticut, USA.
Current Protocols in Protein Science
|April 23, 2008
Summary
This study details methods for modifying amino groups on proteins, enabling the creation of advanced bioconjugates and biosensors. These techniques are crucial for applications in medical imaging and drug development.
Area of Science:
- Biochemistry
- Chemical Biology
- Protein Chemistry
Background:
- Amino group modifications are essential for understanding protein structure-function relationships.
- These modifications are increasingly vital for developing bioconjugates, affinity matrices, biosensors, and labeled macromolecules.
Purpose of the Study:
- To provide protocols for specific group modifications of amino groups.
- To highlight the utility of these modifications in creating functionalized biomolecules for diverse applications.
Main Methods:
- Reaction of amino groups with succinimidyl esters and isothiocyanates for stable coupling.
- Utilizing succinic or acetic anhydrides to alter protein amino group charge.
- Employing reductive alkylation to convert primary amines to secondary or tertiary amines.
Main Results:
- Stable coupling of functional groups like biotin, fluorescent tags, cross-linkers, and metal-chelators to proteins.
- Successful modification of protein charge state and amine type.
- Characterization of products, preferably by mass spectrometry.
Conclusions:
- Group-specific amino group modifications are versatile tools in chemical biology.
- These methods facilitate the preparation of sophisticated biomaterials for research and medical applications.
- Accurate characterization, particularly via mass spectrometry, is key to successful application.
Related Concept Videos
03:42Amino acids
Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible for...
01:19Amines to Amides: Acylation of Amines
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.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary amide...
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary amide...
02:04Covalently Linked Protein Regulators
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
These groups modify specific amino acids in a protein.
01:39Mutations
Overview
01:35Mutations
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
01:02Phosphorylation
The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...