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Structure of Nup58/45 Suggests Flexible Nuclear Pore Diameter by Intermolecular Sliding

Science  23 Mar 2007:
Vol. 315, Issue 5819, pp. 1729-1732
DOI: 10.1126/science.1135730

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Abstract

The nucleoporins Nup58 and Nup45 are part of the central transport channel of the nuclear pore complex, which is thought to have a flexible diameter. In the crystal structure of an α-helical region of mammalian Nup58/45, we identified distinct tetramers, each consisting of two antiparallel hairpin dimers. The intradimeric interface is hydrophobic, whereas dimer-dimer association occurs through large hydrophilic residues. These residues are laterally displaced in various tetramer conformations, which suggests an intermolecular sliding by 11 angstroms. We propose that circumferential sliding plays a role in adjusting the diameter of the central transport channel.

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