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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Purification of NSP1 reveals complex formation with 'GLFG' nucleoporins and a novel nuclear pore protein NIC96.

The essential C-terminal domain of NSP1 mediates assembly into the nuclear pore complex (NPC). To identify components which interact physically with this yeast nucleoporin, the tagged C-terminal domain of NSP1 (ProtA-NSP1) was isolated by affinity chromatography under non-denaturing conditions. The purified complex contains ProtA-NSP1, two previously identified 'GLFG' nucleoporins, NUP49 (NSP49) and p54 and a novel protein designated NIC96 (for Nucleoporin-Interacting Component of 96 kDa). Conversely, affinity purification of tagged NSP49 enriches for NSP1, the p54 and the NIC96 component. The NIC96 gene was cloned; it encodes a novel 839 amino acid protein essential for cell growth. By immunofluorescence, protein A-tagged NIC96 exhibits a punctate nuclear membrane staining indicative of nuclear pore location. Therefore, affinity purification of tagged nucleoporins has allowed the definition of a subcomplex of the NPC and analysis of physical interactions between nuclear pore proteins.[1]


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