Molecular basis of alternating access membrane transport by the sodium-hydantoin transporter Mhp1.
Molecular basis of alternating access membrane transport by the sodium-hydantoin transporter Mhp1.
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DOI:
10.1126/science.1186303
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发表时间:
2010-04-23
期刊:
影响因子:
--
通讯作者:
Cameron AD
中科院分区:
文献类型:
--
作者:
Shimamura T;Weyand S;Beckstein O;Rutherford NG;Hadden JM;Sharples D;Sansom MS;Iwata S;Henderson PJ;Cameron AD
The structure of the sodium-benzylhydantoin transport protein, Mhp1, from Microbacterium liquefaciens comprises a 5-helix inverted repeat, which is widespread amongst secondary transporters. Here we report the crystal structure of an inward-facing conformation of Mhp1 at 3.8 Å resolution, complementing its previously-described structures in outward-facing and occluded states. From analyses of the three structures and molecular dynamics simulations we propose a mechanism for the transport cycle in Mhp1. Switching from the outward- to the inward- facing state, to effect the inward release of sodium and benzylhydantoin, is primarily achieved by a rigid body movement of transmembrane helices 3, 4, 8 and 9 relative to the rest of the protein. This forms the basis of an alternating access mechanism applicable to many transporters of this emerging superfamily.
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DOI:
10.1073/pnas.0804659105
发表时间:
2008-07-29
影响因子:
11.1
作者:
Forrest, Lucy R.;Zhang, Yuan-Wei;Rudnick, Gary
通讯作者:
Rudnick, Gary
影响因子:
3.2
作者:
Suzuki, S;Henderson, PJF
通讯作者:
Henderson, PJF
DOI:
10.1107/s1744309108036920
发表时间:
2008-12-01
影响因子:
0.9
作者:
Shimamura, Tatsuro;Yajima, Shunsuke;Iwata, So
通讯作者:
Iwata, So
DOI:
10.1126/science.1166777
发表时间:
2008-12-12
期刊:
Science (New York, N.Y.)
影响因子:
--
作者:
Singh SK;Piscitelli CL;Yamashita A;Gouaux E
通讯作者:
Gouaux E
影响因子:
5.6
作者:
Beckstein O;Denning EJ;Perilla JR;Woolf TB
通讯作者:
Woolf TB