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A RanBP1 mutation which does not visibly affect nuclear import may reveal additional functions of the ran GTPase system.

Abstract：

:Ran, a nuclear GTPase, and a number of interacting proteins, including regulators RanGEF1 and RanGAP1, are involved in nucleocytoplasmic transport. We have identified a new temperature-sensitive mutation in budding yeast YRB1 gene, which encodes Ran-binding protein-1 (RanBP1). In contrast to other yrb1 alleles, the new mutation (yrb1-21) does not cause visible defects in import of nuclear proteins Npl3p, histone H2B, or beta-galactosidase fused to a nuclear localization signal. We hypothesize that the inviability of mutant cells at the restrictive temperature is caused by an additional essential function of RanBP1 other than nuclear import. This function may be revealed by the terminal phenotypes of yrb1-21, which include failure of the mitotic spindles to properly align along the mother-bud axis and accumulation of cells in late mitosis or G1 phase of the cell cycle. These features are shared, in part, by a mutation in RanGEF1, but not in RanGAP1. The yrb1-21 allele suppresses a RanGEF1 mutation, indicating that RanGEF1 and RanBP1 may be involved in the same essential function.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Ouspenski II

doi

10.1006/excr.1998.4174

subject

Has Abstract

pub_date

1998-10-10 00:00:00

pages

171-83

issue

1

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(98)94174-X

journal_volume

244

pub_type

杂志文章

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