Source:http://linkedlifedata.com/resource/pubmed/id/21464305
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
16
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pubmed:dateCreated |
2011-4-20
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pubmed:abstractText |
The SNF1 protein kinase of Saccharomyces cerevisiae is a member of the SNF1/AMP-activated protein kinase family, which is essential for metabolic control, energy homeostasis, and stress responses in eukaryotes. SNF1 is activated in response to glucose limitation by phosphorylation of Thr210 on the activation loop of the catalytic subunit Snf1. The SNF1 ?-subunit contains a glycogen-binding domain that has been implicated in glucose inhibition of Snf1 Thr210 phosphorylation. To assess the role of glycogen, we examined Snf1 phosphorylation in strains with altered glycogen metabolism. A reg1? mutant, lacking Reg1-Glc7 protein phosphatase 1, exhibits elevated glycogen accumulation and phosphorylation of Snf1 during growth on high levels of glucose. Unexpectedly, mutations that abolished glycogen synthesis also restored Thr210 dephosphorylation in glucose-grown reg1? cells, indicating that elevated glycogen synthesis contributes to activation of SNF1 and that another phosphatase acts on Snf1. We present evidence that Sit4, a type 2A-like protein phosphatase, contributes to dephosphorylation of Snf1 Thr210. Finally, evidence that the effects of glycogen are not mediated by binding to the ?-subunit raises the possibility that elevated glycogen synthesis alters glucose metabolism and thereby reduces glucose signaling to the SNF1 pathway.
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pubmed:grant | |
pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/GLC7 protein, S cerevisiae,
http://linkedlifedata.com/resource/pubmed/chemical/Glucose,
http://linkedlifedata.com/resource/pubmed/chemical/Glycogen,
http://linkedlifedata.com/resource/pubmed/chemical/Protein Phosphatase 1,
http://linkedlifedata.com/resource/pubmed/chemical/Protein Phosphatase 2,
http://linkedlifedata.com/resource/pubmed/chemical/Protein-Serine-Threonine Kinases,
http://linkedlifedata.com/resource/pubmed/chemical/REG1 protein, S cerevisiae,
http://linkedlifedata.com/resource/pubmed/chemical/SIT4 protein, S cerevisiae,
http://linkedlifedata.com/resource/pubmed/chemical/SNF1-related protein kinases,
http://linkedlifedata.com/resource/pubmed/chemical/Saccharomyces cerevisiae Proteins
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pubmed:status |
MEDLINE
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pubmed:month |
Apr
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pubmed:issn |
1091-6490
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pubmed:author | |
pubmed:issnType |
Electronic
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pubmed:day |
19
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pubmed:volume |
108
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
6349-54
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pubmed:dateRevised |
2011-10-19
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pubmed:meshHeading |
pubmed-meshheading:21464305-Glucose,
pubmed-meshheading:21464305-Glycogen,
pubmed-meshheading:21464305-Mutation,
pubmed-meshheading:21464305-Phosphorylation,
pubmed-meshheading:21464305-Protein Phosphatase 1,
pubmed-meshheading:21464305-Protein Phosphatase 2,
pubmed-meshheading:21464305-Protein Structure, Tertiary,
pubmed-meshheading:21464305-Protein-Serine-Threonine Kinases,
pubmed-meshheading:21464305-Saccharomyces cerevisiae,
pubmed-meshheading:21464305-Saccharomyces cerevisiae Proteins
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pubmed:year |
2011
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pubmed:articleTitle |
Roles of two protein phosphatases, Reg1-Glc7 and Sit4, and glycogen synthesis in regulation of SNF1 protein kinase.
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pubmed:affiliation |
Department of Genetics and Development, Columbia University, New York, NY 10032, USA.
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pubmed:publicationType |
Journal Article,
Research Support, N.I.H., Extramural
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