Mig1 localization exhibits biphasic behavior which is controlled by both metabolic and regulatory roles of the sugar kinases

Schmidt, Gregor W.Swiss Federal Institute of Technology in Zürich (ETH) (författare)

Glucose, fructose and mannose are the preferred carbon/energy sources for the yeastSaccharomyces cerevisiae. Absence of preferred energy sources activates glucose derepression, which is regulated by the kinase Snf1. Snf1 phosphorylates the transcriptional repressor Mig1, which results in its exit from the nucleus and subsequent derepression of genes. In contrast, Snf1 is inactive when preferred carbon sources are available, which leads to dephosphorylation of Mig1 and its translocation to the nucleus where Mig1 acts as a transcription repressor. Here we revisit the role of the three hexose kinases, Hxk1, Hxk2 and Glk1, in glucose de/repression. We demonstrate that all three sugar kinases initially affect Mig1 nuclear localization upon addition of glucose, fructose and mannose. This initial import of Mig1 into the nucleus was temporary; for continuous nucleocytoplasmic shuttling of Mig1, Hxk2 is required in the presence of glucose and mannose and in the presence of fructose Hxk2 or Hxk1 is required. Our data suggest that Mig1 import following exposure to preferred energy sources is controlled via two different pathways, where (1) the initial import is regulated by signals derived from metabolism and (2) continuous shuttling is regulated by the Hxk2 and Hxk1 proteins. Mig1 nucleocytoplasmic shuttling appears to be important for the maintenance of the repressed state in which Hxk1/2 seems to play an essential role.

Welkenhuysen, Niek,1988Gothenburg University,Göteborgs universitet,Institutionen för matematiska vetenskaper,Institutionen för kemi och molekylärbiologi,Department of Mathematical Sciences,Department of Chemistry and Molecular Biology,Chalmers tekniska högskola,Chalmers University of Technology,University of Gothenburg(Swepub:cth)niek (författare)
Tian, Ye,1975Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology,University of Gothenburg(Swepub:gu)xtiaye (författare)
Cvijovic, Marija,1977Gothenburg University,Göteborgs universitet,Institutionen för matematiska vetenskaper,Department of Mathematical Sciences,Chalmers tekniska högskola,Chalmers University of Technology,University of Gothenburg(Swepub:cth)marija (författare)
Hohmann, Stefan,1956Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology,Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)hohmann (författare)
Swiss Federal Institute of Technology in Zürich (ETH)Institutionen för matematiska vetenskaper (creator_code:org_t)

Ingår i:Molecular Genetics and Genomics: Springer Science and Business Media LLC295, s. 1489-15001617-46151617-4623

Av författaren/redakt...: Schmidt, Gregor ...; Welkenhuysen, Ni ...; Tian, Ye, 1975; Cvijovic, Marija ...; Hohmann, Stefan, ...

Om ämnet

MEDICIN OCH HÄLSOVETENSKAP: MEDICIN OCH HÄLS ...; och Medicinska och f ...; och Cell och molekyl ...

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