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Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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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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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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Protein families are groups of homologous proteins; that is, they have similarities in amino acid sequences and three-dimensional structures. Protein families usually occur because of gene duplication, where an additional copy of a gene is inserted into the genome of an organism.   Mutations that change the amino acids but still allow the protein to be properly synthesized, will lead to new protein family members.   If these new proteins contain similar amino acids in key...
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Affimer Proteins: Theranostics of the Future?

Stuart Kyle1

  • 1Institute of Life Sciences, Swansea University Medical School, Swansea SA2 8PP, UK.

Trends in Biochemical Sciences
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Summary

Affimer proteins offer a promising alternative to antibodies, targeting molecules with high affinity, specificity, and stability. This versatile protein technology is suitable for bacterial and mammalian expression, with potential in imaging, diagnostics, and therapeutics.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Protein Engineering

Background:

  • Antibodies are conventional tools for molecular targeting but have limitations.
  • Affimer proteins are engineered proteins designed as alternatives to antibodies.
  • Affimer technology offers unique advantages in molecular binding applications.

Purpose of the Study:

  • To highlight the potential of Affimer proteins as a versatile alternative to conventional antibodies.
  • To discuss the characteristics and applications of Affimer protein technology.
  • To explore the future role of Affimers in biological research and medicine.

Main Methods:

  • Selection and expression of Affimer proteins in various systems (bacterial and mammalian).
  • Characterization of Affimer binding properties, including affinity, specificity, and stability.
  • Evaluation of Affimer potential in diverse applications.

Main Results:

  • Affimer proteins demonstrate high affinity, specificity, and stability in targeting molecules.
  • Successful selection and expression of Affimers in both bacterial and mammalian systems.
  • Affimer technology proves adaptable for a broad range of applications.

Conclusions:

  • Affimer proteins represent a promising alternative to antibodies due to their advantageous properties.
  • The versatility of Affimer technology supports its use in advanced biological applications.
  • Affimer proteins are poised to become a significant tool in future imaging, diagnostics, and therapeutics.