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Cooperative Allosteric Transitions01:58

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Protein Complexes with Interchangeable Parts01:57

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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Allosteric Regulation01:08

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Allosteric regulation of enzymes occurs when the binding of an effector molecule to a site that is different from the active site causes a change in the enzymatic activity. This alternate site is called an allosteric site, and an enzyme can contain more than one of these sites. Allosteric regulation can either be positive or negative, resulting in an increase or decrease in enzyme activity. Most enzymes that display allosteric regulation are metabolic enzymes involved in the degradation or...
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Engineering protein assemblies with allosteric control via monomer fold-switching.

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Scientists engineered a protein switch to control nanoscale assembly, demonstrating a new method for designing protein-based nanomachinery. This breakthrough enables on-demand self-assembly of protein monomers into complex structures.

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Area of Science:

  • Protein engineering
  • Nanobiotechnology
  • Structural biology

Background:

  • Biological macromolecular machines utilize allosteric control for self-assembly, dissociation, and shape changes in response to signals.
  • Designing nanoscale allosteric assemblies remains a significant challenge in biotechnology.

Purpose of the Study:

  • To present a proof of concept for allosteric assembly using an engineered protein fold switch.
  • To demonstrate the design principles for creating controllable protein-based nanomachinery.

Main Methods:

  • Engineered the hyper-stable, monomeric protein CI2 (Chymotrypsin Inhibitor 2) to incorporate a fold switch.
  • Utilized a toroidal arrangement with 6-fold symmetry, observed in crystalline CI2.
  • Controlled assembly using competing effects of temperature and a designed peptide.

Main Results:

  • Successfully engineered CI2 to switch between native and a latent fold, enabling self-assembly.
  • Achieved self-assembly onto hexagonal toroidal particles by exposing a favorable inter-monomer interface.
  • Demonstrated on-demand control of protein assembly via external stimuli.

Conclusions:

  • Protein structural metamorphosis has remarkable potential for advanced applications.
  • The study provides key principles for engineering sophisticated protein-based nanomachinery.
  • This work advances the field of programmable protein self-assembly.