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Yeast Srp1, a nuclear protein related toDrosophila and mouse pendulin, is required for normal migration, division, and integrity of nuclei during mitosis

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Abstract

This paper describes genes from yeast and mouse with significant sequence similarities to aDrosophila gene that encodes the blood cell tumor suppressor pendulin. The protein encoded by the yeast gene, Srp1p, and mouse pendulin share 42% and 51% amino acid identity withDrosophila pendulin, respectively. All three proteins consist of 10.5 degenerate tandem repeats of ∼ 42 amino acids each. Similar repeats occur in a superfamily of proteins that includes theDrosophila Armadillo protein. All three proteins contain a consensus sequence for a bipartite nuclear localization signal (NLS) in the N-terminal domain, which is not part of the repeat structure. Confocal microscopic analysis of yeast cells stained with antibodies against Srp1p reveals that this protein is intranuclear throughout the cell cycle. Targeted gene disruption shows thatSRP1 is an essential gene. Despite their sequence similarities,Drosophila and mouse pendulin are unable to rescue the lethality of anSRP1 disruption. We demonstrate that yeast cells depleted of Srp1p arrest in mitosis with a G2 content of DNA. Arrested cells display abnormal structures and orientations of the mitotic spindles, aberrant segregation of the chromatin and the nuclei, and threads of chromatin emanating from the bulk of nuclear DNA. This phenotype suggests that Srplp is required for the normal function of microtubules and the spindle pole bodies, as well as for nuclear integrity. We suggest that Srp1p interacts with multiple components of the cell nucleus that are required for mitosis and discuss its functional similarities to, and differences fromDrosophila pendulin.

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  1. Brookdale Center for Molecular Biology, Mount Sinai School of Medicine, One Gustave L. Levy Place, 10029, New York, NY, USA

    Polonca Küssel & Manfred Frasch

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  1. Polonca Küssel
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  2. Manfred Frasch
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Communicated by G. P. Hollenberg

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Küssel, P., Frasch, M. Yeast Srp1, a nuclear protein related toDrosophila and mouse pendulin, is required for normal migration, division, and integrity of nuclei during mitosis. Molec. Gen. Genet. 248, 351–363 (1995). https://doi.org/10.1007/BF02191602

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  • DOI: https://doi.org/10.1007/BF02191602

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