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. 2002 Sep;83(3):1421–1428. doi: 10.1016/S0006-3495(02)73913-1

Regulation of nuclear pore complex conformation by IP(3) receptor activation.

David Moore-Nichols 1, Anne Arnott 1, Robert C Dunn 1
PMCID: PMC1302241  PMID: 12202368

Abstract

In recent years, both the molecular architecture and functional dynamics of nuclear pore complexes (NPCs) have been revealed with increasing detail. These large, supramolecular assemblages of proteins form channels that span the nuclear envelope of cells, acting as crucial regulators of nuclear import and export. From the cytoplasmic face of the nuclear envelope, nuclear pore complexes exhibit an eightfold symmetric ring structure encompassing a central lumen. The lumen often appears occupied by an additional structure alternatively referred to as the central granule, nuclear transport complex, or nuclear plug. Previous studies have suggested that the central granule may play a role in mediating calcium-dependent regulation of diffusion across the nuclear envelope for intermediate sized molecules (10-40 kDa). Using atomic force microscopy to measure the surface topography of chemically fixed Xenopus laevis oocyte nuclear envelopes, we present measurements of the relative position of the central granule within the NPC lumen under a variety of conditions known to modify nuclear Ca(2+) stores. These measurements reveal a large, approximately 9-nm displacement of the central granule toward the cytoplasmic face of the nuclear envelope under calcium depleting conditions. Additionally, activation of nuclear inositol triphosphate (IP(3)) receptors by the specific agonist, adenophostin A, results in a concentration-dependent displacement of central granule position with an EC(50) of ~1.2 nM. The displacement of the central granule within the NPC is observed on both the cytoplasmic and nucleoplasmic faces of the nuclear envelope. The displacement is blocked upon treatment with xestospongin C, a specific inhibitor of IP(3) receptor activation. These results extend previous models of NPC conformational dynamics linking central granule position to depletion of IP(3) sensitive nuclear envelope calcium stores.

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Selected References

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