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Conservation of Protein Domains Over Different Proteins02:26

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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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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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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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Updated: Jan 14, 2026

Direct Protein Delivery to Mammalian Cells Using Cell-permeable Cys2-His2 Zinc-finger Domains
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Zinc finger domains bind low-complexity domain polymers.

Naohiko Iguchi1, Noriyoshi Isozumi2, Yoshikazu Hattori3

  • 1Department of Neurology, Nara Medical University, Kashihara, Nara, Japan.

Nature Communications
|October 16, 2025
PubMed
Summary
This summary is machine-generated.

Zinc finger domains (ZnFs) recognize and bind to polymers formed by low-complexity protein domains (LC domains). These ZnFs suppress polymer formation, suggesting they regulate these structures in cells.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Low-complexity protein domains (LC domains) self-associate to form polymers, a process crucial for cellular functions.
  • Molecular chaperones regulate LC domain polymer formation, but the mechanisms of cellular recognition remain poorly understood.

Purpose of the Study:

  • To investigate the mechanisms by which cells recognize and regulate LC domain polymers.
  • To identify proteins that interact with LC domain polymers.

Main Methods:

  • Studied the interaction between zinc finger domains (ZnFs) and LC domains of RNA-binding proteins.
  • Utilized hydrogel formation assays to observe LC domain polymerization.
  • Assessed the binding preference of ZnFs for polymeric versus non-polymeric LC domains.

Main Results:

  • Zinc finger domains (ZnFs) bind to LC domains in a manner dependent on cross-β polymer formation.
  • ZnFs were shown to bind to LC domain hydrogels, effectively suppressing further polymer formation.
  • ZnFs exhibit a preferential binding to LC domains when they are in a polymeric state.

Conclusions:

  • Zinc finger domains (ZnFs) act as physiological regulators of LC domain polymer formation.
  • These findings elucidate a novel mechanism for cellular control over biomolecular condensates mediated by ZnFs.