Changes in nucleoporin domain topology in response to chemical effectors

Paulillo, S. M. and Powers, M. A. and Ullman, K. S. and Fahrenkrog, B.. (2006) Changes in nucleoporin domain topology in response to chemical effectors. Journal of molecular biology, Vol. 363, H. 1. pp. 39-50.

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Official URL: http://edoc.unibas.ch/dok/A5259598

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Nucleoporins represent the molecular building blocks of nuclear pore complexes (NPCs), which mediate facilitated macromolecular trafficking between the cytoplasm and nucleus of eukaryotic cells. Phenylalanine-glycine (FG) repeat motifs are found in about one-third of the nucleoporins, and they provide major binding or docking sites for soluble transport receptors. We have shown recently that localization of the FG-repeat domains of vertebrate nucleoporins Nup153 and Nup214 within the NPC is influenced by its transport state. To test whether chemical effectors, such as calcium and ATP, influence the localization of the FG-repeat domains of Nup153 and Nup214 within the NPC, we performed immuno-electron microscopy of Xenopus oocyte nuclei using domain-specific antibodies against Nup153 and Nup214, respectively. Ca2+ and ATP are known to induce conformational changes in the NPC architecture, especially at the cytoplasmic face, but also at the nuclear basket of the NPC. We have found concentrations of calcium in the micromolar range or 1 mM ATP in the surrounding buffer leaves the spatial distribution of the FG-repeat of Nup153 and Nup214 largely unchanged. In contrast, ATP depletion, calcium store depletion by EGTA or thapsigargin, and high concentrations of divalent cation (i.e. 2 mM Ca2+ and 2 mM Mg2+) constrain the distribution of the FG-repeats of Nup153 and Nup214. Our data suggest that the location of the FG-repeat domains of Nup153 and Nup214 is sensitive to chemical changes within the near-field environment of the NPC.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Structural Biology (Fahrenkrog)
UniBasel Contributors:Fahrenkrog, Birthe
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:22 Mar 2012 14:21
Deposited On:22 Mar 2012 13:23

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