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Packing forces in ribonuclease crystals.

M P Crosio1, F Rodier, M Jullien

  • 1Laboratoire de Biologie physico-chimique, Université Paris Sud, Orsay, France.

FEBS Letters
|October 1, 1990
PubMed
Summary

Comparing Ribonuclease A and Ribonuclease S crystal packing reveals how precipitants influence protein interactions. Ammonium sulfate promotes hydrophobic interactions, while organic precipitants favor electrostatic interactions in crystal lattices.

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Area of Science:

  • Protein crystallography
  • Biochemistry
  • Structural biology

Background:

  • Ribonuclease A and Ribonuclease S share similar tertiary structures.
  • Protein crystallization is influenced by precipitating agents, affecting crystal packing.
  • Understanding lattice contacts is crucial for protein structure determination.

Purpose of the Study:

  • To compare crystal packing in Ribonuclease A and Ribonuclease S.
  • To investigate the role of precipitating agents in protein crystal lattice contacts.
  • To elucidate the nature of interactions formed during crystallization.

Main Methods:

  • Comparative analysis of crystal structures of Ribonuclease A and Ribonuclease S.
  • Examination of lattice contacts and buried surface areas.
  • Identification of precipitating agents used for crystallization.

Main Results:

  • Proteins crystallized in different space groups depending on the precipitant.
  • Packing differences observed in the number of nearest neighbors and buried surface areas.
  • Ammonium sulfate promoted hydrophobic interactions at interfaces.
  • Organic precipitants favored electrostatic interactions.

Conclusions:

  • The choice of precipitant significantly impacts protein crystal packing and lattice contacts.
  • Hydrophobic and electrostatic interactions play distinct roles depending on the precipitant.
  • This study provides insights into controlling protein crystallization through precipitant selection.

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