Document Actions
A novel allele of Saccharomyces cerevisi ... Ndc1p in nuclear pore assembly
A novel allele of Saccharomyces cerevisiae NDC1 reveals a potential role for the spindle pole body component Ndc1p in nuclear pore assembly.
44
Both the spindle pole body (SPB) and the nuclear pore complex (NPC) are essential organelles embedded in the nuclear envelope throughout the life cycle of the budding yeast Saccharomyces cerevisiae. However, the mechanism by which these two multisubunit structures are inserted into the nuclear envelope during their biogenesis is not well understood. We have previously shown that Ndc1p is the only known integral membrane protein that localizes to both the SPBs and the NPCs and is required for SPB duplication. For this study, we generated a novel temperature-sensitive (ts) allele of NDC1 to investigate the role of Ndc1p at the NPCs. Yeast cells carrying this allele (ndc1-39) failed to insert the SPB into the nuclear envelope at the restrictive temperature. Importantly, the double mutation of ndc1-39 and NPC assembly mutant nic96-1 resulted in cells with enhanced growth defects. While nuclear protein import and NPC distribution in the nuclear envelope were unaffected, ndc1-39 mutants failed to properly incorporate the nucleoporin Nup49p into NPCs. These results provide evidence that Ndc1p is required for NPC assembly in addition to its role in SPB duplication. We postulate that Ndc1p is crucial for the biogenesis of both the SPBs and the NPCs at the step of insertion into the nuclear envelope.
Lau CK, Giddings TH, Winey M
Eukaryotic cell
2004-04-01 00:00
3
2
447-58
Alleles,Chromosome Segregation,Flow Cytometry,Membrane Proteins,Microscopy, Fluorescence,Microscopy, Immunoelectron,Mitotic Spindle Apparatus,Nuclear Pore,Nuclear Pore Complex Proteins,Nuclear Proteins,Saccharomyces cerevisiae,Saccharomyces cerevisiae Proteins,Sequence Deletion,Temperature,Membrane Proteins,NDC1 protein, S cerevisiae,NIC96 protein, S cerevisiae,Nuclear Pore Complex Proteins,Nuclear Proteins,Saccharomyces cerevisiae Proteins,NUP49 protein, S cerevisiae
MCD Biology, University of Colorado-Boulder, Boulder, Colorado 80309-0347, USA
Eukaryotic Cell
NIGMS GM-07135, NIGMS GM-59992
1535-9778
1229
True
15075274
