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. 2011 Oct 3;6(10):e25296. doi: 10.1371/journal.pone.0025296

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Chen et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Individual TRAP subunits are shown as ball-and-stick models in different shades of grey. Inter-subunit rotation axes are roughly parallel to the central oligomer axis and are depicted by black crosses shown in yellow circles. (A) Removal of the C-terminal segment (green) at one side of the axis or (B) introduction of methylene group through Val-11-Leu mutation (blue) at the other side of the axis, allows subunits to roll around the inter-subunit rotation axis to form a 12-mer.