The role of hydrophobic interactions in ankyrin-spectrin complex formation

Research output: Contribution to journalArticle

Authors

  • A Kolondra
  • M Wolny
  • A Czogalla
  • AF Sikorski
  • M Grzybek

Colleges, School and Institutes

Abstract

Spectrin and ankyrin are the key components of the erythrocyte cytoskeleton. The recently published crystal structure of the spectrin-ankyrin complex has indicated that their binding involves complementary charge interactions as well as hydrophobic interactions. However, only the former is supported by biochemical evidence. We now show that nonpolar interactions are important for high affinity complex formation, excluding the possibility that the binding is exclusively mediated by association of distinctly charged surfaces. Along these lines we report that substitution of a single hydrophobic residue, F917S in ankyrin, disrupts the structure of the binding site and leads to complete loss of spectrin affinity. Finally, we present data showing that minimal ankyrin binding site in spectrin is formed by helix 14C together with the loop between helices 15 B/C. (C) 2010 Elsevier B.V. All rights reserved.

Details

Original languageEnglish
Pages (from-to)2084-2089
Number of pages6
JournalBiochimica et Biophysica Acta (BBA) - Biomembranes
Volume1798
Issue number11
Publication statusPublished - 1 Nov 2010

Keywords

  • Spectrin-ankyrin interaction, Binding study, Nonpolar interaction