Cation-π- (Na+-Trp) interactions in the crystal structure of tetragonal lysozyme

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Abstract

Experimental evidence of a cation-π interaction between a sodium cation (Na+) and the indole ring of residue Trp123 in a structure (2.0 Å) of hen egg-white lysozyme is presented. The geometry of the metal ion-π interaction observed in the protein structure (distance between the aromatic plane and the cation ~4 Å) is consistent with geometries observed among small molecules crystal structures and quantum chemistry ab initio calculations. The present crystal structure of lysozyme provides unique structural information about the geometry of binding of cations to systems in proteins. It shows that the metal ion-π interaction within proteins is not significantly different from similar bindings found in small molecules and that it can be modeled by theoretical methods.

Original languageEnglish
Pages (from-to)2472-2475
Number of pages4
JournalProtein science : a publication of the Protein Society
Volume7
Issue number11
Publication statusPublished - 1 Nov 1998

Keywords

  • Ab initio calculations
  • Cation-π interaction
  • CSD search
  • Lysozyme
  • X-ray crystallography

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