Structural convergence among diverse, toxic beta-sheet ion channels.
Structural convergence among diverse, toxic beta-sheet ion channels.
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DOI:
10.1021/jp104073k
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发表时间:
2010-07-29
影响因子:
3.3
通讯作者:
Nussinov, Ruth
中科院分区:
文献类型:
--
作者:
Jang, Hyunbum;Arce, Fernando Teran;Ramachandran, Srinivasan;Capone, Ricardo;Lal, Ratnesh;Nussinov, Ruth
Recent studies show that an array of β-sheet peptides, including N-terminally truncated Aβ peptides (Aβ11−42/17−42), K3 (a β2-microglobulin fragment), and protegrin-1 (PG-1) peptides form ion channel-like structures and elicit single channel ion conductance when reconstituted in lipid bilayers and induce cell damage through cell calcium overload. Striking similarities are observed in the dimensions of these toxic channels irrespective of their amino acid sequences. However, the intriguing question of preferred channel sizes is still unresolved. Here, exploiting ssNMR-based, U-shaped, β-strand-turn-β-strand coordinates, we modeled truncated Aβ peptide (p3) channels with different sizes (12- to 36-mer). Molecular dynamics (MD) simulations show that optimal channel sizes of the ion channels presenting toxic ionic flux range between 16- and 24-mer. This observation is in good agreement with channel dimensions imaged by AFM for Aβ9−42, K3 fragment, and PG-1 channels and highlights the bilayer-supported preferred toxic β-channel sizes and organization, regardless of the peptide sequence.
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影响因子:
4.3
作者:
ARISPE, N;POLLARD, HB;ROJAS, E
通讯作者:
ROJAS, E
影响因子:
4
作者:
Kourie, JI;Henry, CL;Farrelly, P
通讯作者:
Farrelly, P
DOI:
10.1073/pnas.0607815103
发表时间:
2006-10-31
影响因子:
11.1
作者:
Ferguson, Neil;Becker, Johanna;Fersht, Alan R.
通讯作者:
Fersht, Alan R.
DOI:
10.1002/prot.340230412
发表时间:
1995-12-01
期刊:
PROTEINS-STRUCTURE FUNCTION AND GENETICS
影响因子:
--
作者:
Frishman, D;Argos, P
通讯作者:
Argos, P
影响因子:
3
作者:
BROOKS, BR;BRUCCOLERI, RE;KARPLUS, M
通讯作者:
KARPLUS, M