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J Cell Biol. 2014 Feb 17;204(4):523-39. doi: 10.1083/jcb.201307043. Epub 2014 Feb 10.

The SUN protein Mps3 controls Ndc1 distribution and function on the nuclear membrane.

Author information

1
Stowers Institute for Medical Research, Kansas City, MO 64110.

Abstract

In closed mitotic systems such as Saccharomyces cerevisiae, nuclear pore complexes (NPCs) and the spindle pole body (SPB) must assemble into an intact nuclear envelope (NE). Ndc1 is a highly conserved integral membrane protein involved in insertion of both complexes. In this study, we show that Ndc1 interacts with the SUN domain-containing protein Mps3 on the NE in live yeast cells using fluorescence cross-correlation spectroscopy. Genetic and molecular analysis of a series of new ndc1 alleles allowed us to understand the role of Ndc1-Mps3 binding at the NE. We show that the ndc1-L562S allele is unable to associate specifically with Mps3 and find that this mutant is lethal due to a defect in SPB duplication. Unlike other ndc1 alleles, the growth and Mps3 binding defect of ndc1-L562S is fully suppressed by deletion of POM152, which encodes a NPC component. Based on our data we propose that the Ndc1-Mps3 interaction is important for controlling the distribution of Ndc1 between the NPC and SPB.

PMID:
24515347
PMCID:
PMC3926959
DOI:
10.1083/jcb.201307043
[Indexed for MEDLINE]
Free PMC Article

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