Nuclear import of Spo12p, a protein essential for meiosis.
J Biol Chem
; 276(21): 17712-7, 2001 May 25.
Article
en En
| MEDLINE
| ID: mdl-11278742
ABSTRACT
In Saccharomyces cerevisiae, Spo12p is involved in mitosis and is essential for meiosis. We found that Spo12p is imported into the nucleus by the karyopherin Kap121p. A complex containing Spo12p and Kap121p was isolated from cytosol and was also reconstituted with recombinant proteins, indicating that this interaction is direct. Spo12p was mislocalized to the cytosol in pse1-1, a temperature-sensitive strain harboring a mutation of Kap121p, at the permissive temperature, confirming an essential role for Kap121p in Spo12p import. Spo12p was also mislocalized in a pse1-1/pse1-1 homozygous strain, suggesting it is imported via the same pathway in diploid cells. Furthermore, we found that pse1-1/pse1-1 shows a sporulation defect similar to that of spo12Delta/spo12Delta. In addition, we have characterized the Spo12p nuclear localization signal, mapped it to residues 76-130, and identified residues within this region that are important for nuclear localization signal function.
Buscar en Google
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Saccharomyces cerevisiae
/
Proteínas Fúngicas
Idioma:
En
Revista:
J Biol Chem
Año:
2001
Tipo del documento:
Article
País de afiliación:
Estados Unidos