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Related Concept Videos

Protein Complex Assembly02:41

Protein Complex Assembly

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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Updated: Dec 25, 2025

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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A Modular Method for Directing Protein Self-Assembly.

James A J Arpino1,2, Karen Marie Polizzi1,2

  • 1Department of Chemical Engineering, Imperial College London, London SW7 2AZ, United Kingdom.

ACS Synthetic Biology
|April 4, 2020
PubMed
Summary

Researchers developed a modular protein assembly method using supercharged protein scaffolds. This technique enables tunable biomaterial properties and facilitates the creation of novel protein-based materials for various applications.

Keywords:
biomaterialsenzyme scaffoldingliving materialsmolecular self-assemblysupercharged proteinsynthetic biology

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Area of Science:

  • Biomaterials Science
  • Protein Engineering
  • Synthetic Biology

Background:

  • Proteins are versatile macromolecules crucial for biomaterials in drug delivery, biosensing, and tissue engineering.
  • Growing demand for green chemistry drives interest in biocatalytic routes for chemical synthesis.
  • Reliable methods for assembling protein complexes are needed for rapid material production.

Purpose of the Study:

  • To present a novel method for modular assembly of protein materials.
  • To enable tunable physical properties and controlled disassembly of protein-based materials.
  • To explore the extension of this system to the synthesis of living materials.

Main Methods:

  • Utilized supercharged proteins as scaffolding 'hubs'.
  • Assembled target proteins with oppositely charged domains onto the scaffold.
  • Encoded charged tag domains in fusion proteins for directed self-assembly.

Main Results:

  • Demonstrated a modular method for self-assembling protein materials.
  • Showcased tunable material properties via blending and heating.
  • Achieved triggered disassembly using changes in pH or salt concentration.

Conclusions:

  • The developed modular method reliably directs protein self-assembly.
  • This approach facilitates the rapid production of new protein-based materials.
  • The system shows potential for creating advanced biomaterials and living materials.