The DOI matches its Crossref record; 29 of the 29 references it cites were found in a registry or an index.
Synthetic Amphiphilic Peptide Models for Protein Ion Channels
Abstract
Ion channel proteins are important for the conduction of ions across biological membranes. Recent analyses of their sequences have suggested that they are composed of bundles of α-helices that associate to form ion-conducting channels. To gain insight into the mechanisms by which α-helices can aggregate and conduct ions, three model peptides containing only leucine and serine residues were synthesized and characterized. A 21-residue peptide, H 2 N-(Leu-Ser-Ser-Leu-Leu-Ser-Leu) 3 -CONH 2 , which was designed to be a membrane-spanning amphiphilic α-helix, formed well-defined ion channels with ion permeability and lifetime characteristics resembling the acetylcholine receptor. In contrast, a 14-residue version of this peptide, which was too short to span the phospholipid bilayer as an α-helix, failed to form discrete, stable channels. A third peptide, H 2 N-(Leu-Ser-Leu-Leu-Leu-Ser-Leu) 3 -CONH 2 , in which one serine per heptad repeat was replaced by leucine, produced proton-selective channels. Computer graphics and energy minimization were used to create molecular models that were consistent with the observed properties of the channels.
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Metadata
- Authors
- Lear, J. D., Wasserman, Z. R., & DeGrado, W. F.
- Venue
- Science
- Published
- 1988-05-27
- Volume
- 240
- Issue
- 4856
- Pages
- 1177-1181
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W1969583827
- Cited by
- 607
- References
- 29
- FWCI
- 12.83
- Type
- journal article
- Language
- en
- Open access
- closed
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