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Structural basis for recognition by an in vitro evolved affibody.

Martin Högbom1, Malin Eklund, Per-Ake Nygren

  • 1Department of Biochemistry and Biophysics, Stockholm University, Roslagstullsbacken 15, Albanova University Center, SE-10691 Stockholm, Sweden.

Proceedings of the National Academy of Sciences of the United States of America
|February 27, 2003
PubMed
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In vitro evolved affibody proteins offer a promising alternative to antibodies for various applications. Structural analysis reveals their binding mode to protein Z is similar to antibody interactions, suggesting potential for universal binding applications.

Area of Science:

  • Biochemistry and structural biology
  • Protein engineering and molecular recognition

Background:

  • Antibodies are widely used but limited by generation efficiency.
  • In vitro evolved binding proteins, like affibodies, are emerging alternatives.
  • Combinatorial libraries enable selection of proteins with novel binding capabilities.

Purpose of the Study:

  • To determine the crystal structure of an affibody bound to protein Z.
  • To elucidate the binding interface and compare it to antibody-Fc interactions.
  • To assess the potential of affibodies as universal binding proteins.

Main Methods:

  • X-ray crystallography to solve the complex structure.
  • Structural analysis of the affibody-protein Z interface.
  • Comparison of binding surfaces with known antibody-Fc interactions.

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Main Results:

  • The crystal structure of an alpha-helical affibody complexed with protein Z was solved.
  • The binding surface is extended and complementary, mimicking protein-antibody interactions.
  • The recognized surface on protein Z resembles the IgG Fc binding site, indicating potential hot-spots.

Conclusions:

  • Affibodies exhibit binding characteristics comparable to antibodies.
  • The identified binding mode supports the development of affibodies as universal binding proteins.
  • Structural insights facilitate the design of affibody-based applications.