Pore dynamics and asymmetric cargo loading in an encapsulin nanocompartment.

Pore dynamics and asymmetric cargo loading in an encapsulin nanocompartment.
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DOI:
10.1126/sciadv.abj4461
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发表时间:
2022-01-28
期刊:
影响因子:
13.6
通讯作者:
Marles-Wright J
Marles-Wright J
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ross J;McIver Z;Lambert T;Piergentili C;Bird JE;Gallagher KJ;Cruickshank FL;James P;Zarazúa-Arvizu E;Horsfall LE;Waldron KJ;Wilson MD;Mackay CL;Baslé A;Clarke DJ;Marles-Wright J

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Encapsulins are protein nanocompartments that house various cargo enzymes, including a family of decameric ferritin-like proteins. Here, we study a recombinant Haliangium ochraceum encapsulin:encapsulated ferritin complex using cryo–electron microscopy and hydrogen/deuterium exchange mass spectrometry to gain insight into the structural relationship between the encapsulin shell and its protein cargo. An asymmetric single-particle reconstruction reveals four encapsulated ferritin decamers in a tetrahedral arrangement within the encapsulin nanocompartment. This leads to a symmetry mismatch between the protein cargo and the icosahedral encapsulin shell. The encapsulated ferritin decamers are offset from the interior face of the encapsulin shell. Using hydrogen/deuterium exchange mass spectrometry, we observed the dynamic behavior of the major fivefold pore in the encapsulin shell and show the pore opening via the movement of the encapsulin A-domain. These data will accelerate efforts to engineer the encapsulation of heterologous cargo proteins and to alter the permeability of the encapsulin shell via pore modifications. Cryo-EM and HDX-MS analysis of an encapsulin nanocompartment shows that the fivefold pores of the encapusulin shell are flexible.
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