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Related Concept Videos

Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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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.
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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Related Experiment Video

Updated: May 27, 2025

Combining Chemical Cross-linking and Mass Spectrometry of Intact Protein Complexes to Study the Architecture of Multi-subunit Protein Assemblies
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A Macrocycle-Assisted Platform Approach to Protein Cross-Linking Via Chemically Inactive Residues.

Zhongyu Li1, Liping Pu1, Delong Hou1,2

  • 1Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, PR China.

Nano Letters
|February 19, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method to cross-link proteins using engineered macrocycles that bind to inactive aromatic residues. This approach enhances bioassembly engineering and function by overcoming limitations of traditional cross-linking methods.

Keywords:
BioassembliesCucurbit[7]urilHost−guest bindingProtein cross-linking

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Area of Science:

  • Biochemistry
  • Protein Engineering
  • Materials Science

Background:

  • Traditional protein cross-linking relies on chemically active residues (amines/carboxyls).
  • Depletion of these active sites limits further engineering and biological function of protein assemblies.

Purpose of the Study:

  • To develop a new platform for cross-linking proteins via chemically inactive residues.
  • To engineer bioassemblies with enhanced stability and functionality.

Main Methods:

  • Utilized molecularly engineered cucurbit[7]uril macrocycles for selective, noncovalent binding to aromatic residues.
  • Applied this macrocycle-assisted approach to various natural proteins.

Main Results:

  • Achieved protein cross-linking through previously inactive residues.
  • Resulting bioassemblies demonstrated mechanical strength, thermal, and enzymatic stability comparable or superior to gold-standard methods.
  • Successfully engineered proteins with new cross-linking handles.

Conclusions:

  • The macrocycle-assisted platform offers a novel strategy for protein bioassembly fabrication.
  • This method overcomes intrinsic limitations of conventional chemical cross-linking.
  • Enables creation of advanced bioassemblies for diverse applications.