GroEL as a molecular scaffold for structural analysis of the anthrax toxin pore.
GroEL as a molecular scaffold for structural analysis of the anthrax toxin pore.
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DOI:
10.1038/nsmb.1442
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发表时间:
2008-07
影响因子:
16.8
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中科院分区:
文献类型:
--
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We analyzed the 440-kDa transmembrane pore formed by the protective antigen (PA) moiety of anthrax toxin in the presence of GroEL by negative-stain electron microscopy. GroEL binds both the heptameric PA prepore and the PA pore. The latter interaction retards aggregation of the pore, prolonging its insertion-competent state. Two populations of unaggregated pores were visible: GroEL-bound pores and unbound pores. This allowed two virtually identical structures to be reconstructed, at 25-Å and 28-Å resolution, respectively. The structures were mushroom-shaped objects with a 125-Å-diameter cap and a 100-Å-long stem, consistent with earlier biochemical data. Thus, GroEL provides a platform for obtaining initial glimpses of a membrane protein structure in the absence of lipids or detergents and can function as a scaffold for higher-resolution structural analysis of the PA pore.
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影响因子:
2.9
作者:
Miller, CJ;Elliott, JL;Collier, RJ
通讯作者:
Collier, RJ
影响因子:
2.9
作者:
Nassi, S;Collier, RJ;Finkelstein, A
通讯作者:
Finkelstein, A
影响因子:
4.8
作者:
Rosovitz, MJ;Schuck, P;Leppla, SH
通讯作者:
Leppla, SH
DOI:
10.1073/pnas.0405754101
发表时间:
2004-11-30
影响因子:
11.1
作者:
Zhang, S;Finkelstein, A;Collier, RJ
通讯作者:
Collier, RJ
影响因子:
8
作者:
Voziyan, PA;Fisher, MT
通讯作者:
Fisher, MT