Removing an interhelical salt bridge abolishes coiled-coil formation in a de novo designed peptideMeier, M., Lustig, A., Aebi, U., Burkhard, P.
(2002) J.STRUCT.BIOL. 137: 65-72
- PubMed: 12064934
- DOI: 10.1006/jsbi.2002.4467
- PubMed Abstract:
- The Coiled-coil Trigger Site of the Rod Domain of Cortexillin I Unveils a Distinct Network of Interhelical and Intrahelical Salt Bridges
Burkhard, P.,Kammerer, R.A.,Steinmetz, M.O.,Bourenkov, G.P.,Aebi, U.
(2000) Structure 8: 223
- Design of a Minimal Protein Oligomerization Domain by a Structural Approach
Burkhard, P.,Meier, M.,Lustig, A.
(2000) Protein Sci. 9: 2294
- Improving coiled-coil stability by optimizing ionic interactions
Burkhard, P.,Ivaninskii, S.,Lustig, A.
() TO BE PUBLISHED --: --
Alpha-helical coiled coils represent a common protein oligomerization motif that are mainly stabilized by hydrophobic interactions occurring along their coiled-coil interface, the so-called hydrophobic seam. We have recently de novo designed and opti ...
Alpha-helical coiled coils represent a common protein oligomerization motif that are mainly stabilized by hydrophobic interactions occurring along their coiled-coil interface, the so-called hydrophobic seam. We have recently de novo designed and optimized a series of two-heptad repeat long coiled-coil peptides which are further stabilized by a complex network of inter- and intrahelical salt bridges. Here we have extended the de novo design of such two heptad-repeat long peptides by removing the central and most important g-e' Arg to Glu (g-e'RE) ionic interhelical interaction and replacing these residues by alanine residues. The effect of the missing interhelical ionic interaction on coiled-coil formation and stability has been analyzed by CD spectroscopy, analytical ultracentrifugation, and X-ray crystallography. We show that the peptide, while being highly alpha-helical, is no longer able to form a parallel coiled-coil structure but rather assumes an octameric globular helical assembly devoid of any coiled-coil interactions.
M.E. Müller Institute for Structural Biology, University of Basel, Switzerland.