An alpha/beta-peptide helix bundle with a pure beta3-amino acid core and a distinctive quaternary structure.
An alpha/beta-peptide helix bundle with a pure beta3-amino acid core and a distinctive quaternary structure.
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DOI:
10.1021/ja8099294
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发表时间:
2009-07-29
影响因子:
15
通讯作者:
Gellman SH
中科院分区:
文献类型:
--
作者:
Giuliano MW;Horne WS;Gellman SH
Helix bundles are among the most widely studied tertiary and quaternary structural motifs in proteins. Here we present the crystal structure of an α/β-peptide foldamer that adopts a tetrameric helix-bundle quaternary structure with a hydrophobic core composed solely of β-amino acids. The structure displays features that are unprecedented among all known helix bundles composed of either α-peptides or peptidic foldamers. The tetramer is characterized by an asymmetry of interaction between neighboring helices, and the side-chain packing within the hydrophobic core differs fundamentally from the knobs-into-holes arrangement typical of most helix bundles.
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