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Related Concept Videos

Protein Networks02:26

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An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
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Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
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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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Identification of Protein Interacting Partners Using Tandem Affinity Purification
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Structured Tandem Repeats in Protein Interactions.

Juan Mac Donagh1,2, Abril Marchesini2,3, Agostina Spiga1,2

  • 1Science and Technology Department, National University of Quilmes, Bernal B1876, Argentina.

International Journal of Molecular Sciences
|March 13, 2024
PubMed
Summary
This summary is machine-generated.

Tandem repeat proteins (TRPs) utilize structured surfaces for binding, with open ensembles facilitating protein interactions. Despite potential for evolution, their repeat units are surprisingly conserved, suggesting early fixation for functional advantage.

Keywords:
protein evolutionprotein flexibilityprotein structureprotein–protein interactionstandem repeats

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Area of Science:

  • Protein structure and evolution
  • Molecular biology
  • Bioinformatics

Background:

  • Tandem repeats (TRs) are repetitive sequence motifs in proteins.
  • TRs can form structural ensembles, either open (elongated) or closed (propeller-like).

Purpose of the Study:

  • Investigate how sequence, structure, and evolution of TR proteins (TRPs) enable their function as mediators of protein interactions.
  • Understand the properties of open TR ensembles.

Main Methods:

  • Analysis of protein sequence data
  • Structural analysis of TR ensembles
  • Evolutionary analysis of TRs

Main Results:

  • TRPs bind other proteins via large, structured surfaces, particularly open ensembles.
  • Open TR ensembles feature flexible termini and coil tightly around targets.
  • Insertions/deletions of TR units are rare, suggesting early evolutionary fixation.

Conclusions:

  • The flexibility of open TR ensembles facilitates adaptation for protein binding.
  • TRPs act as scaffolds for diverse protein complexes, organizing genes, RNA, and proteins.
  • Conserved TR units in open ensembles are advantageous for ancestral sequence emergence.