skip to main content

This content will become publicly available on April 27, 2016

Title: High-resolution structures of a heterochiral coiled coil

Interactions between polypeptide chains containing amino acid residues with opposite absolute configurations have long been a source of interest and speculation, but there is very little structural information for such heterochiral associations. The need to address this lacuna has grown in recent years because of increasing interest in the use of peptides generated from D amino acids (D peptides) as specific ligands for natural proteins, e.g., to inhibit deleterious protein–protein interactions. Coiled–coil interactions, between or among α-helices, represent the most common tertiary and quaternary packing motif in proteins. Heterochiral coiled–coil interactions were predicted over 50 years ago by Crick, and limited experimental data obtained in solution suggest that such interactions can indeed occur. To address the dearth of atomic-level structural characterization of heterochiral helix pairings, we report in this paper two independent crystal structures that elucidate coiled-coil packing between L- and D-peptide helices. Both structures resulted from racemic crystallization of a peptide corresponding to the transmembrane segment of the influenza M2 protein. Networks of canonical knobs-into-holes side-chain packing interactions are observed at each helical interface. Finally, however, the underlying patterns for these heterochiral coiled coils seem to deviate from the heptad sequence repeat that is characteristic of most homochiral analogs,more » with an apparent preference for a hendecad repeat pattern.« less
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [1] ;  [2] ;  [1] ;  [3] ;  [1]
  1. Univ. of Wisconsin, Madison, WI (United States). Dept. of Chemistry
  2. Anatrace, Maumee, OH (United States)
  3. Univ. of Wisconsin, Madison, WI (United States). Dept. of Bacteriology
Publication Date:
OSTI Identifier:
1235128
Grant/Contract Number:
AC02-06CH11357; GM061238; NA14OAR4170092; CHE-1152347; T32 GM08293; T32 GM008349; DMR-0832760; DMR-1121288; 085P1000817
Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 112; Journal Issue: 43; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Research Org:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org:
USDOE Office of Science (SC); National Inst. of Health (NIH) (United States); National Oceanic and Atmospheric Administration (NOAA) (United States); National Science Foundation (NSF); 3M Corporation (United States); Michigan Economic Development Corporation (United States); Michigan Technology Tri-Corridor (United States)
Contributing Orgs:
Anatrace, Maumee, OH (United States)
Country of Publication:
United States
Language:
ENGLISH
Subject:
60 APPLIED LIFE SCIENCES; 59 BASIC BIOLOGICAL SCIENCES; D peptides; transmembrane peptides; racemic crystallization; racemic detergent; coiled coil