Covalent Cross-linking
Covalent Cross-linking - Related Videos
02:04
Covalently Linked Protein Regulators
0 Views •
2020
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.
02:04
Covalently Linked Protein Regulators
0 Views •
2023
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.
08:40
Photo-Induced Cross-Linking of Unmodified Proteins (PICUP) Applied to Amyloidogenic Peptides
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Cited by 91 •
2009
Photo-induced cross-linking of unmodified proteins (PICUP) allows characterization of oligomer size distribution in metastable protein mixtures. We demonstrate application of PICUP to three representative amyloidogenic peptides the 40- and 42-residue forms of amyloid β-protein, and calcitonin, and a control peptide growth-hormone releasing factor.
07:02
The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
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Cited by 3 •
2016
A simple two-step approach involving rubber modification and cross-linking yields fully reworkable, elastic rubber products.
02:46
Covalent Bonding and Lewis Structures
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2020
Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons. Covalent bonds are formed between two atoms when both have similar tendencies to attract electrons to themselves (i.e., when both atoms have identical or fairly similar ionization energies and electron affinities). Physical Properties of Covalent Compounds Compounds that contain covalent...
FAQs
The reactive functional groups on a cross-linking reagent provide the chemical points of attachment. In biological applications, these groups can join amino acid side chains or other biomolecular components, connecting structures that are positioned close enough to react. The resulting links reduce molecular movement and help preserve the organization of proteins or larger biological assemblies during analysis.
Covalent cross-linking strengthens biological structures by converting separate molecular components into an interconnected network. Because the connections are stable, they limit changes in the relative positions of linked molecules. This stabilization can preserve spatial relationships and support the examination of cell, tissue, or protein architecture when structural organization is important to the research question.
Controlled chemical conditions determine whether reactive groups can form the intended molecular connections while preserving the structures being studied. Researchers adjust the reaction environment to support linking between selected biomolecular components and to obtain a useful level of structural restriction. Appropriate control is therefore important for reliable fixation, molecular characterization, and material design.
By restricting molecular movement, covalent cross-linking can preserve spatial relationships that might otherwise change during analysis. This provides a stabilized record of how biological components were arranged within a structure, which supports characterization of molecular interactions. In protein research, that preserved organization can help investigators examine associations within larger biological assemblies.
A typical application begins by selecting a cross-linking reagent with reactive functional groups suited to the biomolecular components of interest. Researchers then expose the sample to the reagent under controlled chemical conditions, allowing links to form, and examine the stabilized material or structure. The workflow may support protein fixation, interaction characterization, or preparation of biomaterials.
Applications extend to cross-linked hydrogels and other biomaterials, where interconnected molecular networks can provide increased structural stability. These materials are relevant to drug delivery and tissue engineering, while the preservation of cell and tissue architecture supports diagnostic technologies. The same chemical principle therefore connects molecular-scale stabilization with the design and study of biological materials.