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Two-dimensional protein crystals on a solid substrate: effect of surface ligand concentration.

Chengfei Lou1, Zifu Wang, Szu-Wen Wang

  • 1Department of Chemical Engineering and Materials Science, Developmental Biology Center, University of California, Irvine, California 92697, USA.

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Summary

Surface ligand concentration controls streptavidin crystal structure on lipid bilayers. Higher concentrations promote C222 symmetry crystals, while lower concentrations yield P1 symmetry, influencing protein self-assembly.

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Area of Science:

  • Biophysics
  • Materials Science
  • Surface Chemistry

Background:

  • Solid-supported lipid bilayers (SSLBs) are crucial models for cellular membranes and surface protein behavior.
  • Investigating protein self-assembly on SSLBs provides insights into molecular interactions and array formation.

Purpose of the Study:

  • To examine the self-assembly of streptavidin on mica-supported bilayer membranes.
  • To determine how surface ligand concentration affects streptavidin crystal morphology and molecular packing.

Main Methods:

  • Utilized fluorescence microscopy and atomic force microscopy (AFM) to study protein arrays.
  • Employed ligand-inhibition and fluorescence recovery after photobleaching (FRAP) to analyze mechanisms.

Main Results:

  • Two-dimensional streptavidin crystals with P1 symmetry form at 1.5% biotinylated lipid density.
  • Crystals with C222 symmetry, forming H-shaped and confluent structures, appear at 3% and above.
  • Intermediate densities show a coexistence of P1 and C222 crystal forms.
  • Protein diffusion coefficients differ based on crystal symmetry, indicating distinct binding states.

Conclusions:

  • Surface ligand concentration is a key factor in dictating streptavidin self-assembly and crystal morphology on SSLBs.
  • Protein-protein interactions dominate over substrate interactions in this self-assembly process.
  • Differential binding states (mono- vs. bi-ligand) influence protein flexibility and crystallization behavior.